Scratch (programming language)

This article is about the programming language. For other uses, see Scratch (disambiguation).

Scratch
Scratch logo
Logo used since 16 October 2015
Scratch 3.0 editor
ParadigmEvent-driven, block-based programming language
DeveloperScratch Foundation
First appeared
  • 11 October 2003; 21 years ago (2003-10-11) (prototype Scratch 0.1)[1]
  • 15 May 2007; 17 years ago (2007-05-15) (Scratch 1.0)[2]
  • 9 May 2013; 11 years ago (2013-05-09) (Scratch 2.0)
  • 2 January 2019; 5 years ago (2019-01-02) (Scratch 3.0)
Stable release
  • Scratch 3.0 (online editor) / 2 January 2019; 5 years ago (2019-01-02)
  • Scratch 3.29.1 (offline editor) / 27 February 2022; 2 years ago (2022-02-27)
Implementation languageSqueak (Scratch 1.x)
ActionScript (Scratch 2.0)[3]
HTML5, JavaScript (Scratch 3.0)[3][4]
OSMicrosoft Windows, macOS, Linux (via renderer), HTML5 (via web browser), iOS, iPadOS, and Android.
LicenseBSD 3-Clause, GPLv2 and Scratch Source Code License
Filename extensions.sb, .sprite (Scratch 1.x)
.sb2, .sprite2 (Scratch 2.0)
.sb3, .sprite3 (Scratch 3.0)
Websitescratch.mit.edu
Influenced by
Logo, Smalltalk, HyperCard, StarLogo, AgentSheets, AgentCubes, Etoys
Influenced
Catrobat,[5] ScratchJr,[6] Snap!,[7] mBlock, Turtlestitch

Scratch is a high-level, block-based visual programming language and website aimed primarily at children as an educational tool, with a target audience of ages 8 to 16.[8] Users on the site can create projects on the website using a block-like interface. Scratch was conceived and designed through collaborative National Science Foundation grants awarded to Mitchel Resnick and Yasmin Kafai.[9] Scratch is developed by the MIT Media Lab and has been translated into 70+ languages, being used in most parts of the world.[10] Scratch is taught and used in after-school centers, schools, and colleges, as well as other public knowledge institutions. As of 15 February 2023, community statistics on the language's official website show more than 123 million projects shared by over 103 million users, and more than 95 million monthly website visits.[10] Overall, over 1 billion total projects have been created (including unshared projects), with the site reaching its 1,000,000,000th project in April 2024.

Scratch takes its name from a technique used by disk jockeys called "scratching", where vinyl records are clipped together and manipulated on a turntable to produce different sound effects and music. Like scratching, the website lets users mix together different media (including graphics, sound, and other programs) in creative ways by creating and "remixing" projects, like video games, animations, music, and simulations.[11][12]

Scratch 3.0

User interface

A program to change the background and make a sprite speak

The Scratch interface is divided into three main sections: a stage area, block palette, and a coding area to place and arrange the blocks into scripts that can be run by pressing the green flag or clicking on the code itself. Users may also create their own code blocks, which will appear in the "My Blocks" section.

The stage area features the results (e.g., animations, turtle graphics, either in a small or normal size, with a full-screen option also available) and all sprites' thumbnails being listed in the bottom area. The stage uses x and y coordinates, with 0,0 being the stage center.[13]

With a sprite selected at the bottom of the staging area, blocks of code can be applied by dragging them from the block palette into the coding area. The Costumes tab allows users to change the look of the sprite with a vector and bitmap editor in order to create various effects, including animation.[13] The Sounds tab allows attaching sounds and music to a sprite.[14]

When creating sprites and also backgrounds, users can draw their own sprites manually,[13] choose a sprite from the library, or upload an image.[14]

The table below shows the categories of the programming blocks:

Block categories in Scratch
Category Notes
Motion Movements of sprites, like angles and directions.
Looks Controls the visuals of the sprite.
Sound Plays audio files and effects.
Events Event handlers and broadcasters.
Control Conditionals, loops, and cloning.
Sensing Sprites can interact with other sprites, the mouse pointer, and the backdrop.
Operators Mathematical operators, conjunctions, and comparisons .
Variables Blocks to access and set variables. Cloud variables are synced across all running versions of the project.
Lists Blocks to access and interact with lists.
My Blocks User-defined functions, accessible as blocks. They can have inputs and have the option to run without a screen refresh.
Extensions Extra categories (e.g. Pen, Music) of blocks that can be added to a project at any time.

Offline editing

One of the 4 different scripts for the getting started built-in tutorial.
Four different scripts for the getting started built-in tutorial.

An offline "Desktop Editor" for Scratch 3.0 is available for Microsoft Windows 10 and above in the Microsoft Store, Apple's macOS, ChromeOS, and Android;[15] this allows the creation and playing of Scratch programs offline. The offline editor can also be downloaded in previous versions, such as Scratch 2.0 and Scratch 1.4 (an archive of older versions is found here).

Extensions

In Scratch, extensions add extra blocks and features that can be used in projects. In Scratch 2.0, the extensions were all hardware-based and Pen was a normal category. Software-based extensions were added in Scratch 3.0, such as text-to-speech voices, along with some new hardware-based extensions like the micro:bit. The extensions are listed below.

An example of the Scratch 3 Extensions Page.

Physical

  • LEGO Mindstorms EV3 – Control motors and receive sensor data from the Lego Mindstorms EV3
  • Makey Makey – Use Makey Makey to control projects
  • LEGO Education WeDo 2.0 – control motors and receive sensor data from the Lego WeDo
  • micro:bit – Use of a micro:bit to control projects
  • LEGO BOOST – Bring robotic creations to life
  • Go Direct Force & Acceleration – Sense pull, push, motion, and spin

Digital

Many of the digital extensions in Scratch 3.0 used to be regular block categories that were moved to the extensions section to reduce clutter. These include:

  • Music – Play digital instruments (drums, trumpets, violins, pianos, and more). Previously part of the Sound category.
  • Pen – Draw on the Stage with a variety of thicknesses and color. Previously a normal block category.
  • Video Sensing – Detect motion with the camera. Previously in the Sensing category.

New digital extensions have also been added in collaborations with commercial companies. These include:

  • Text to Speech – Converts words in a text into voice output (variety of voices, supplied by Amazon)
  • Translate – Uses Google Translate to translate text from one language into a variety of other languages, including Arabic, Chinese, Dutch, English, French, Greek, Norwegian, and Japanese
  • Makey Makey – Options for better key pressing and press multiple keys in order. You can grab a join block if you want more control on the extension.

A paper published in 2019 by NYU argues and illustrates, for coding music with Scratch, "that the music and sound blocks as currently implemented in Scratch may limit and frustrate meaningful music-making for children, the core user base for Scratch."[16]

Scratch Lab

The Scratch Lab[17] displays experiments from the Scratch Team, intended to explore whether new features may be added to the full website in the future. Experimental features currently under development include:

  • Video Sprites – Fill sprites with live video.
  • Face Sensing – Make animated costumes and games that interact with your face.
  • Animated Text – Bring words to life with colours, fonts, and animations.

Community of users

A Scratch programming workshop

Scratch is used in many different settings: schools, museums, libraries, community centers, and homes.[18][19][11] Scratch is designed primarily for users aged 8–16, but it is used by all ages and has a sizeable adult user base as of 2009.[8][20] This wide outreach has created many surrounding communities, both physical and digital.[10] In April 2020, the Tiobe ranking of the world's programming languages included Scratch in the top 20. According to Tiobe, there are 50 million projects written in Scratch, and every month one million new projects are added.[21]

Educational users

Scratch is used as the introductory language because the creation of interesting programs is relatively easy, and skills learned can be applied to other programming languages such as Python and Java.

Scratch is not exclusively for creating games. With the provided visuals, programmers can create animations, text, stories, music, art, and more. There are already many programs that students can use to learn topics in math, history, and even photography. Scratch allows teachers to create conceptual and visual lessons and science lab assignments with animations that help visualize difficult concepts. Within the social sciences, instructors can create quizzes, games, and tutorials with interactive elements. Using Scratch allows young people to understand the logic of programming and how to creatively build and collaborate.[22]

Scratch is taught to more than 800 schools and 70 colleges of the DAV organization in India and across the world.[23][24]

In higher education, Scratch is used in the first week of Harvard University's CS50 introductory computer science course.[25][26]

Online community

"Jumper", an example of a game created with Scratch 2.0
Shadow on Scratch
"Shadow", an example of a game created with Scratch 3.0

Users of Scratch are called "Scratchers". Scratchers have the capability to share their projects and receive feedback. Projects can be uploaded directly from the development environment to the Scratch website and any member of the community can view and download the full source code to study or to remix into new projects.[27][28] Scratchers can also create project studios, comment, favorite, and "love" others' projects, follow other members to see their projects and activity, and share ideas. Projects range from games and animations to practical tools. Additionally, to encourage the creation and sharing amongst users, the website frequently establishes "Scratch Design Studio" challenges.[29]

The MIT Scratch Team works to ensure that this community maintains a friendly and respectful environment for all people.[30][31]

Educators have their own online community called ScratchEd, developed and supported by the Harvard Graduate School of Education. In this community, Scratch educators share stories, exchange resources, and ask questions.[32]

Scratch Wiki

The Scratch Wiki is a support resource for Scratch and information about its website, history, and phenomena surrounding it. Although supported by the Scratch Team (the developers of Scratch), it is primarily written by Scratch users (Scratchers) and is hosted independently of the main Scratch website.[33] There are other wikis in languages besides English available on the Scratch Wiki base domain.

Roles

Roles are displayed as a label under a user's username on profile pages and on forum posts. To prevent vandalism, new accounts have the "New Scratcher" role, as opposed by the usual "Scratcher" role. Some restrictions are imposed onto New Scratcher accounts, including the inability to use cloud data and a minimum 30 second cooldown period between posting comments.[34] After a period of time of interacting and creating projects, an account will be eligible to gain the Scratcher role.[35]

Official moderators and developers of Scratch are labeled as part of the "Scratch Team" and usually have an asterisk at the end of their username.[36] The site also has special types of accounts for Students and Educators to use Scratch in the classroom.[37]

Censorship

In August 2020, GreatFire announced that the Chinese government had blocked access to the Scratch website. At the time, it was estimated that more than three million people in China were using it.[38][citation needed] The outlet cited the fact that Macau, Hong Kong and Taiwan were listed as countries on the website.[38][39] They also contain Abkhazia, Somaliland, South Ossetia, and Faroe Islands are locations, but they only seem to be seen in Scratch Statistics on the Scratchers Worldwide section, and nobody has made an account in these countries.

Code base

The source code for the project editor in all three major versions, as well as a majority of the current website, is hosted publicly on GitHub across various repositores.[40] Scratch 3.0 is JavaScript-based, 2.0 is programmed in ActionScript,[4] and the 1.x versions were based on Squeak, which itself is based on Smalltalk-80.[41]

2.0 had an experimental JavaScript-based interpreter that was being developed in parallel with the ActionScript version.[42]

In 3.0, Scratch blocks are implemented using Blockly, a JavaScript library developed by Google for creating block-based visual programming languages.[43][44]

On 13 May 2014, a year after the release of Scratch 2.0, it was announced by a developer on the Scratch Forums that 2.0 would become open source.[45]

Events

Scratch Educators can gather in person at Scratch Educator Meetups. At these gatherings, Scratch Educators learn from each other and share ideas and strategies that support computational creativity.[46]

An annual "Scratch Week", formerly known as "Scratch Day", is declared in May each year. Community members are encouraged to host an event on or around this day, large or small, that celebrates Scratch. These events are held worldwide, and a listing can be found on the Scratch Day website. Scratch Week is a series focusing on Scratch activities on the Scratch website.[47]

Every April Fools' Day, the Scratch Team will play pranks on users and add Easter eggs, one example being that all event blocks in projects turn into cat versions of the same blocks.

History

In the early 2000s, the MIT Media Lab's Lifelong Kindergarten group (LLK) was developing visual programming languages targeted towards children.[48] In 2003, Mitchel Resnick, Yasmin Kafai, and John Maeda were awarded a National Science Foundation grant for the development of a new programming environment for children to express themselves with code.[9] The LLK, led by Mitchel Resnick, in partnership with Yasmin Kafai's team at UCLA worked closely with Computer Clubhouses in Boston and Los Angeles to develop Scratch, grounding its design in the practices and social dynamics of these after-school youth centers.[9] It started as a basic programming language, with no labeled categories and no green flag.[49] Similar to AgentSheets[50] Scratch employed concepts of Tactile Programming later known as blocks-based programming. Scratch was made with the intention to teach kids to program.[49]

The philosophy of Scratch encourages the sharing, reuse, and combination of code, as indicated by the team slogan, "Imagine, Program, Share".[51] Users can make their own projects, or they may choose to "remix" someone else's project. Projects created and remixed with Scratch are licensed under the Creative Commons Attribution-Share Alike License.[52] Scratch automatically gives credit to the user who created the original project and program in the top part of the project page.[11]

Scratch was developed based on ongoing interaction with youth and staff at Computer Clubhouses. The use of Scratch at Computer Clubhouses served as a model for other after-school centers demonstrating how informal learning settings can support the development of technological fluency.[53]

Scratch 2.0 was released on 9 May 2013.[13] The update changed the look of the site and included both an online project editor and an offline editor.[54] Custom blocks could now be defined within projects, along with several other improvements.[55] The Scratch 2.0 Offline editor could be downloaded for Windows, Mac, and Linux directly from Scratch's website, although support for Linux was later dropped. The unofficial mobile version had to be downloaded from the Scratch forums.[56][57]

The Scratch website's homepage

Scratch 3.0 was first announced by the Scratch Team in 2016. Several public alpha versions were released between then and January 2018, after which the pre-beta "Preview" versions were released.[58] A beta version of Scratch 3.0 was released on 1 August 2018.[59] for use on most browsers; with the notable exception of Internet Explorer.[60]

Scratch 3.0, the first 3.x release version, was released on 2 January 2019.[61] On 28 June 2023,[62] the header and links on the Scratch Website changed from blue to purple, and new optional high-contrast block colors were introduced, to make the site easier for colorblind people to read and use.[63]

On March 11, 2019, Scratch separated from MIT Media Lab.[64]

Filetypes

In Scratch 1.4, an *.sb file was the file format used to store projects.[65]

An *.sb file is divided into four sections:

  • "header", this 10-byte header contains the ASCII string "ScratchV02" in versions higher than Scratch 1.2, and "ScratchV01" in Scratch 1.2 and below
  • "infoSize", encodes the length of the project's infoObjects. A 4-byte long, 32-bit, big-Endian integer.
  • "infoObjects", a dictionary-format data section. It contains: "thumbnail", a thumbnail of the project's stage; "author", the username of the project's creator; "comment", the Project Notes; "history", the save and upload log; "scratch-version", the version of Scratch used to save the file;
  • "contents", an object table with the Stage as the root.[66] All objects in the program are stored here as references.[67]

Scratch 2.0 uses the *.sb2 file format. These are zip files containing a .json file as well as the contents of the Scratch project including sounds (stored as .wav) and images (stored as .png).[68] Each filetype, excluding the project.json, is stored as a number, starting at 0 and counting up with each additional file. The image file labeled "0.png" is always a 480x360 white image, but "0.wav" will still be the earliest non-deleted file.

The ScratchX experimental version of Scratch used the .sbx file format.[69]

Scratch 3.0 uses the *.sb3 format, which is very similar to *.sb2, one difference being the sound.[70]

Older versions

Although the main Scratch website now runs only the current version (Scratch 3.0), the offline editors for Scratch 2.0 (and the earlier Scratch 1.4) are still available for download[71] and can be used to create and run games locally.[72] It is still possible to upload projects from the Scratch 2.0 launcher, which are immediately converted into Scratch 3.0 when uploaded to the main site.[73] There is also an offline version of Scratch 3.0.

Technology

The editor of Scratch 1.4 and below was written in Squeak, while its online project viewer was written in Java, and a player written in Adobe Flash was later added.[41][74] Scratch 2.0 relied on Adobe Flash for the online version, and Adobe AIR for the offline editor. These have fallen out of favor, and Adobe dropped support for them at the end of 2020.[75][76]

Interface

A script that lets the sprite say Hello, World! then stops the script in Scratch 2.0

In Scratch 2.0, the stage area is on the left side, with the programming blocks palette in the middle, and the coding area on the right. Extensions are in the "More Blocks" section of the palette.[20]

The web version of Scratch 2.0 introduced project autosaving.[77]: 23 

The blocks palette in Scratch 2.0 is made of discrete sections that are not scrollable from one to the next; the table below shows the different sections:

Interface sections in Scratch
Category Notes
Motion Moves and changes the position of sprites
Events Event handlers
Looks Controls the visuals of the sprite
Control Conditionals and loops
Sound Audio files, sequences, and music
Sensing Sprite interaction
Pen Draw on the canvas
Operators Mathematical operators
Data Variables, arrays and lists
More Blocks Functions, return value is always void

Scratch 2.0 introduced the backpack, which can be used to transfer scripts, sprites, costumes, and sounds between projects.[77]: 14–15 

1.4 sounds

Scratch 2.0 changed how sounds were imported, so many Scratch 1.4 sounds stopped working. (The project file was changed from *.sb to *.sb2).

Features

Scratch uses event-driven programming with multiple active objects called sprites.[13] Sprites can be drawn, as vector or bitmap graphics, from scratch in a simple editor that is part of Scratch, or can be imported from external sources. Scratch 3.0 only supports one-dimensional arrays, known as "lists", and floating-point scalars and strings are supported but with limited string manipulation ability. There is a strong contrast between the powerful multimedia functions and multi-threaded programming style and the rather limited scope of the Scratch programming language.

Scratch 2.0 features

Scratch 2.0 does not treat procedures as first class structures and has limited file I/O options with Scratch 2.0 Extension Protocol, an experimental extension feature that allows interaction between Scratch 2.0 and other programs.[78] The Extension protocol allows interfacing with hardware boards such as Lego Mindstorms[79] or Arduino.[80] Scratch 2.0 also has the following features:

  • Smart block switching
  • Two-column category menu
  • Reverse order of project controls
  • Display stage on left side
  • Square block inputs
  • Compact editor
  • Collapsing sprite properties
  • Scratch 2.0 themes

Snap! (Build Your Own Blocks)

A more advanced visual programming language inspired by Scratch is Snap!, featuring first class procedures (their mathematical foundations are also called lambda calculus), first-class lists (including lists of lists), and first-class truly object-oriented sprites with prototyping inheritance, and nestable sprites, which are not part of Scratch.[81] Snap! (previously "BYOB") was developed by Jens Mönig[82][83] with documentation provided by Brian Harvey[84][85] from University of California, Berkeley and has been used to teach "The Beauty and Joy of Computing" introductory course in CS for non-CS-major students.[86] Both of them were members of the Scratch Team before designing "Snap!".[87][20]

ScratchJr

In July 2014, ScratchJr was released for iPad, and in 2016, ScratchJr for Android. Although heavily inspired by Scratch and co-led by Mitch Resnick, it is nonetheless a complete rewrite designed for younger children—targeting ages 5 through 7.[88]

Community-made modifications

Due to the open source nature of Scratch, numerous forks and browser extensions have been created by the community that aim to improve or modify the user experience. ScratchTools and Scratch Addons are some examples of open-sourced browser extensions that add many upgrades and new features to the Scratch website and editor.[89]

TurboWarp is a fork of the Scratch 3.0 editor that compiles the Scratch blocks into JavaScript code when a project is run, meaning projects can run up to 200x faster, with 60FPS option, results varying heavily depending on the project, and setting and add-ons.[90][91] TurboWarp can also export projects to standalone HTML5, Bundle (macOS) and EXE files.[92]

Users can also create their own extensions for Scratch 3.0 using JavaScript.[93] Although the intention for Scratch 3.0 was to allow unofficial JavaScript extensions to be developed by users, it was abandoned due to moderation risks. As a result, the official site doesn't allow JavaScript extensions to be added, but several modifications of Scratch do.

Before 2.0, a number of Scratch forks[94][better source needed] were created using the source code of Scratch 1.4. These programs usually only included a few extra blocks not present in Scratch.[95][better source needed]

See also

References

  1. ^ Maloney, John; Burd, Leo; Kafai, Yasmin; Rusk, Natalie; Silverman, Brian; Resnick, Mitchel (29–30 January 2004). Scratch: A Sneak Preview. Second International Conference on Creating, Connecting and Collaborating through Computing. Section 6: Project status and next steps. doi:10.1109/C5.2004.33 – via ResearchGate.
  2. ^ "Scratch Timeline – Scratch Wiki". en.scratch-wiki.info.
  3. ^ a b Lee, David (28 December 2018). "What you need to know about Scratch 3.0". Computhink. Retrieved 9 February 2024.
  4. ^ a b Frang, Corey (28 February 2019). "Porting Scratch from Flash to JavaScript: Performance, Interoperability and Extensions". bocoup. Retrieved 9 February 2024.
  5. ^ "Catrobat Home". catrobat.org.
  6. ^ "ScratchJr – Home". scratchjr.org.
  7. ^ "Snap! Build Your Own Blocks". snap.berkeley.edu.
  8. ^ a b scratch, scratch (11 October 2022). "Scratch – About". scratch.mit.edu.
  9. ^ a b c "NSF Award Search: Award # 0325828 – ITR: A Networked, Media-Rich Programming Environment to Enhance Informal Learning and Technological Fluency at Community Technology Centers". www.nsf.gov. Retrieved 15 April 2021.
  10. ^ a b c "Community statistics at a glance". scratch.mit.edu. Archived from the original on 6 April 2016. Retrieved 18 May 2019.
  11. ^ a b c Lamb, Annette; Johnson, Larry (April 2011). "Scratch: Computer Programming for 21st Century Learners" (PDF). Teacher Librarian. 38 (4): 64–68. Retrieved 18 May 2019.
  12. ^ Schorow, Stephanie (14 May 2007). "Creating from Scratch". MIT News. Archived from the original on 13 October 2018. Retrieved 18 May 2019.
  13. ^ a b c d e Marji, Majed (2014). Learn to Program with Scratch. San Francisco, California: No Starch Press. pp. xvii, 1–9, 13–15. ISBN 978-1-59327-543-3.
  14. ^ a b "Science Buddies: Scratch User Guide: Installing & Getting Started with Scratch". ScienceBuddies.org. Archived from the original on 18 May 2019. Retrieved 18 May 2019.
  15. ^ "Scratch Desktop". Retrieved 19 September 2019.
  16. ^ "Music Making in Scratch: High Floors, Low Ceilings, and Narrow Walls? /". Jitp.commons.gc.cuny.edu. 16 May 2019. Retrieved 27 February 2022.
  17. ^ "Scratch Lab". lab.scratch.mit.edu. Retrieved 27 September 2023.
  18. ^ Oliveira, Michael (30 April 2014). "Canadian schools starting to teach computer coding to kids". CTV.ca. Archived from the original on 18 May 2019. Retrieved 18 May 2019.
  19. ^ "Scratch Day". Science Museum of Minnesota. Archived from the original on 8 April 2013. Retrieved 18 May 2019.
  20. ^ a b c Resnick, Mitchel; Maloney, John; Hernández, Andrés; Rusk, Natalie; Eastmond, Evelyn; Brennan, Karen; Millner, Amon; Rosenbaum, Eric; Silver, Jay; Silverman, Brian; Kafai, Yasmin (2009). "Scratch: Programming for All" (PDF). Communications of the ACM. 52 (11): 60–67. doi:10.1145/1592761.1592779. S2CID 229934947.
  21. ^ Fay, Joe (6 April 2020). "Kids programming language Scratch nails top 20 in latest dev rankings • DEVCLASS". DEVCLASS. Retrieved 27 April 2020.
  22. ^ Martin, Neil (25 June 2015). "What is Scratch? Is it AV or IT?". AV Magazine. Archived from the original on 18 May 2019. Retrieved 18 May 2019.
  23. ^ "DAV CS Syllabus" (PDF). Archived from the original (PDF) on 13 July 2018. Retrieved 18 May 2019.
  24. ^ "DAV Jharkhand Syllabus". Retrieved 18 May 2019.
  25. ^ Young, Jeffrey R. (20 July 2007). "Fun, Not Fear, Is at the Heart of Scratch, a New Programming Language". The Chronicle of Higher Education. ISSN 0009-5982. Archived from the original on 18 May 2019. Retrieved 18 May 2019.
  26. ^ "CS50 Syllabus". Archived from the original on 17 March 2015. Retrieved 18 May 2019.
  27. ^ Monroy-Hernandez, Andres; Hill, Benjamin Mako; Gonzalez-Rivero, Jazmin; Boyd, Danah (2011). "Computers Can't Give Credit: How Automatic Attribution Falls Short in an Online Remixing Community". Proceedings of the 29th International Conference on Human Factors in Computing Systems (CHI '11). ACM. pp. 3421–30. arXiv:1507.01285. doi:10.1145/1978942.1979452. S2CID 7494330.
  28. ^ Hill, B.M; Monroy-Hernández, A.; Olson, K.R. (2010). "Responses to remixing on a social media sharing website". ICWSM 2010: Proceedings of the 4th International Conference on Weblogs and Social Media, May 23–26, 2010. Washington, D.C.: AAAI Press. arXiv:1507.01284. Bibcode:2015arXiv150701284M. ISBN 978-1-57735-445-1. OCLC 844857775.
  29. ^ "Scratch Design Studio". wiki.scratch.mit.edu. Archived from the original on 18 May 2019. Retrieved 18 May 2019.
  30. ^ "For Parents". scratch.mit.edu. Archived from the original on 4 April 2019. Retrieved 18 May 2019.
  31. ^ "Scratch Community Guidelines". scratch.mit.edu. Archived from the original on 7 April 2019. Retrieved 18 May 2019.
  32. ^ "Scratch for Educators". scratch.mit.edu. Archived from the original on 5 October 2008. Retrieved 18 May 2010.
  33. ^ "Scratch Wiki". en.scratch-wiki.info. Archived from the original on 12 May 2019. Retrieved 18 May 2019.
  34. ^ jvvg (1 June 2013). "An explanation of the 'New Scratcher' status". Discuss Scratch. Retrieved 11 January 2024.
  35. ^ "What is a Scratcher and how do I become one?". mitscratch.freshdesk.com. 4 November 2021. Retrieved 10 February 2024.
  36. ^ "Scratch Team - Scratch Wiki". en.scratch-wiki.info. Retrieved 26 May 2023.
  37. ^ "Student and Teacher Accounts - Scratch Wiki". en.scratch-wiki.info. Retrieved 26 May 2023.
  38. ^ a b Liao, Rita (7 September 2020). "China bans Scratch, MIT's programming language for kids". TechCrunch. Retrieved 27 April 2021.
  39. ^ "China blocks MIT's kid-friendly programming language Scratch". Developer Tech News. 8 September 2020. Retrieved 19 November 2020.
  40. ^ "Scratch Source Code". Scratch Wiki. Retrieved 8 April 2024.
  41. ^ a b "Scratch". Squeak/Smalltalk. Retrieved 7 March 2021.
  42. ^ Lightnin (29 October 2013). "We're seeking contributors to help finish our HTML5 Scratch player (now open sourced!)". Discuss Scratch. Retrieved 18 May 2019.
  43. ^ "Blockly". Google Developers.
  44. ^ Pasternak, Erik (17 January 2019). "Scratch 3.0's new programming blocks, built on Blockly". Retrieved 2 October 2019.
  45. ^ speakvisually (13 May 2014). "Scratch 2.0 Offline Open Source Code!". Discuss Scratch. Retrieved 13 January 2024.
  46. ^ "Scratch Educator". Meetup.com. Archived from the original on 21 April 2019. Retrieved 18 May 2019.
  47. ^ "Scratch Week". Archived from the original on 7 April 2019. Retrieved 18 May 2019.
  48. ^ "LLK – Projects – Building-Block Programming". llk.media.mit.edu. Archived from the original on 30 April 2001. Retrieved 19 December 2021.
  49. ^ a b "Development of Scratch 1.0". en.scratch-wiki.info. Archived from the original on 3 January 2019. Retrieved 18 May 2019.
  50. ^ "Tactile Programming: A Unified Manipulation Paradigm Supporting Program Comprehension, Composition and Sharing". Retrieved 15 October 2021.
  51. ^ "Scratch – Imagine, Program, Share". scratch.mit.edu. Archived from the original on 22 February 2011. Retrieved 18 May 2019.
  52. ^ "Creative Commons License". wiki.scratch.mit.edu. Archived from the original on 18 May 2019. Retrieved 18 May 2019.
  53. ^ "ITR: A Networked, Media-Rich Programming Environment to Enhance Informal Learning and Technological Fluency at Community Technology Centers". National Science Foundation. Archived from the original on 30 December 2015. Retrieved 18 May 2019.
  54. ^ "Scratch Desktop". scratch.mit.edu. Archived from the original on 6 April 2019. Retrieved 18 May 2019.
  55. ^ Biggs, John (10 May 2013). "Kids' Programming Tool Scratch Now Runs in the Browser". TechCrunch. Archived from the original on 9 July 2017. Retrieved 18 May 2019.
  56. ^ Shane (grokblah), on behalf of the Scratch Team (29 August 2013). "Updated Scratch 2 Offline Editor (Beta) is now available!". Discuss Scratch. Retrieved 18 May 2019.
  57. ^ "Scratch 2.0 Preview". YouTube. MITScratchTeam. 1 May 2013. Archived from the original on 24 January 2014. Retrieved 18 May 2019.
  58. ^ "Scratch 3.0". en.scratch-wiki.info. Archived from the original on 9 May 2019. Retrieved 18 May 2019.
  59. ^ "3 Things To Know About Scratch 3.0". Medium.com. 31 January 2019. Archived from the original on 12 May 2019. Retrieved 18 May 2019.
  60. ^ "Scratch 3.0". scratch.mit.edu. Archived from the original on 6 April 2019. Retrieved 18 May 2019.
  61. ^ "Scratch 3.0 – Scratch Wiki". en.scratch-wiki.info. Retrieved 27 April 2021.
  62. ^ ceebee, on behalf of the Scratch Team (28 June 2023). "Color Contrast is here!". Discuss Scratch. Retrieved 5 September 2023.
  63. ^ ceebee, on behalf of the Scratch Team (5 June 2023). "Coming Soon: Color Contrast in Scratch!". Discuss Scratch. Retrieved 5 September 2023.
  64. ^ Mitchel Resnick, one of the founders of Scratch (12 March 2019). "Supporting the Growth of Scratch - Mitchel Resnick - Medium". Medium. Retrieved 5 March 2024.
  65. ^ "Scratch Wiki – *.sb". 4 October 2015. Retrieved 7 November 2015.
  66. ^ "Scratch File Format (1.4)/Object Table – Scratch Wiki". en.scratch-wiki.info. Retrieved 19 February 2022.
  67. ^ "Scratch File Format (1.4)/Object Table – Scratch Wiki". en.scratch-wiki.info. Retrieved 19 February 2022.
  68. ^ "Scratch File Format (2.0)". Scratch Wiki. Retrieved 2 October 2019.
  69. ^ "LLK/scratchx". GitHub. 16 August 2022.
  70. ^ "Scratch File Format". Scratch Wiki. Retrieved 2 October 2019.
  71. ^ "Scratch 2.0 Offline Editor". MIT. Retrieved 21 September 2019.
  72. ^ "3 Things To Know About Scratch 3.0". The Scratch Team. 31 January 2019. Retrieved 21 September 2019.
  73. ^ "Offline Editor (2.0) – Scratch Wiki". en.scratch-wiki.info. Retrieved 27 April 2021.
  74. ^ "Scratch Forums / Beta Flash player". Scratch Archived Forums. Retrieved 7 March 2021.
  75. ^ O'Donnell, Lindsey (14 January 2019). "Mozilla Kills Default Support for Adobe Flash in Firefox 69". Retrieved 21 September 2019.
  76. ^ Adobe Corporate Communications (30 May 2019). "The Future of Adobe AIR". Retrieved 21 September 2019.
  77. ^ a b McManus, Sean (2013). Scratch Programming in easy steps. Leamington Spa: Easy Steps. ISBN 978-1-84078-612-5.
  78. ^ "Scratch Extension". MIT. Archived from the original on 18 May 2019. Retrieved 18 May 2019.
  79. ^ "EV3+Scratch Extension". Scratch extension GitHub. Code & Circuit. Archived from the original on 20 January 2016. Retrieved 18 May 2019.
  80. ^ "Preliminary Scratch extension for talking to Arduino boards running Firmata". Scratch extension GitHub. Damellis. Archived from the original on 16 January 2018. Retrieved 18 May 2019.
  81. ^ "Snap! – Build Your Own Blocks". University of California, Berkeley. Archived from the original on 16 May 2019. Retrieved 18 May 2019.
  82. ^ Mönig, Jens. "Jens on Scratch". Scratch. Archived from the original on 18 May 2019. Retrieved 18 May 2019.
  83. ^ Mönig, Jens (31 May 2011). "BYOB 3.1 – Prototypal Inheritance for Scratch". Chirp Blog. Archived from the original on 6 December 2013. Retrieved 18 May 2019.
  84. ^ "Brian Harvey". Electrical Engineering and Computer Sciences. Archived from the original on 3 April 2019. Retrieved 18 May 2019.
  85. ^ "bharvey". Scratch. Archived from the original on 18 May 2019. Retrieved 18 May 2019.
  86. ^ "CS10 : The Beauty and Joy of Computing". EECS Instructional Support Group Home Page. Archived from the original on 23 January 2014. Retrieved 18 May 2019.
  87. ^ "Relationship With the Scratch Team".
  88. ^ "About ScratchJr". scratchjr.org. Retrieved 19 September 2019.
  89. ^ "Frequently Asked Questions". Scratch Addons Docs. Retrieved 7 January 2024.
  90. ^ "How TurboWarp runs Scratch projects 10-100x faster | TurboWarp Documentation". docs.turbowarp.org. Retrieved 7 January 2024.
  91. ^ "TurboWarp - Run Scratch projects faster". turbowarp.org. Retrieved 17 April 2022.
  92. ^ "TurboWarp Packager". packager.turbowarp.org. Retrieved 7 January 2024.
  93. ^ "Scratch 3.0 Extensions". Github. MIT. Retrieved 19 September 2019.
  94. ^ "Scratch Modification". Scratch Wiki. Lifelong Kindergarten Group at the MIT Media Lab. Archived from the original on 18 May 2019. Retrieved 18 May 2019.
  95. ^ "Blocks". Scratch Wiki. Archived from the original on 18 May 2019. Retrieved 18 May 2019.
Wikimedia Commons has media related to Scratch (programming language).
Wikibooks has a book on the topic of: Scratch

Read other articles:

ExxonMobil

Halaman ini berisi artikel tentang Exxon Mobil Corp. Untuk anak usahanya, lihat Exxon dan Mobil. Exxon Mobil CorporationJenisPublikKode emitenNYSE: XOMKomponen S&P 100Komponen S&P 500ISINUS30231G1022IndustriEnergi: Minyak dan gasPendahuluExxonMobilDidirikan30 November 1999; 24 tahun lalu (1999-11-30)PendiriTerutama diturunkan dari Standard Oil yang didirikan oleh John D. RockefellerKantorpusatIrving, Texas, Amerika SerikatWilayah operasiSeluruh duniaTokohkunciDarren Woods (chairm...

 

 

Final Piala FA 1956

Final Piala FA 1956TurnamenPiala FA 1955–1956 Manchester City Birmingham City 3 1 Tanggal5 Mei 1956StadionStadion Wembley, LondonWasitAlf BondPenonton100.000← 1955 1957 → Final Piala FA 1956 adalah pertandingan sepak bola antara Manchester City dan Birmingham City yang diselenggarakan pada 5 Mei 1956 di Stadion Wembley, London. Pertandingan ini merupakan pertandingan final ke-75 Piala FA sebagai pertandingan penentu pemenang musim 1955–1956. Pertandingan ini dimenangkan oleh M...

 

 

Kherson

City in Kherson Oblast, Ukraine This article is about the modern city. For the Greek colony, see Chersonesus. For other uses, see Kherson (disambiguation). City in UkraineKherson ХерсонCityClockwise from top: St Catherine's cathedral, Memorial in Park Slavy, view of the Dnieper in Kherson, the clock tower of the Kherson Regional Art Museum, a monument to Potemkin in Potomkinskyi Garden Square. FlagCoat of armsKhersonLocation of KhersonShow map of Kherson OblastKhersonKherson (Ukraine)Sh...

List of United States Supreme Court cases, volume 200

Supreme Court of the United States38°53′26″N 77°00′16″W / 38.89056°N 77.00444°W / 38.89056; -77.00444EstablishedMarch 4, 1789; 235 years ago (1789-03-04)LocationWashington, D.C.Coordinates38°53′26″N 77°00′16″W / 38.89056°N 77.00444°W / 38.89056; -77.00444Composition methodPresidential nomination with Senate confirmationAuthorized byConstitution of the United States, Art. III, § 1Judge term lengthl...

 

 

Bison

Pour les articles homonymes, voir Bison (homonymie). Bison Bisons d'Europe (Bison bonasus).Classification Règne Animalia Embranchement Chordata Sous-embr. Vertebrata Classe Mammalia Sous-classe Theria Infra-classe Eutheria Ordre Artiodactyla Famille Bovidae Sous-famille Bovinae GenreBisonSmith, 1827 Les Bisons (Bison) forment un genre de grands bovidés ruminants dont il existe deux espèces vivantes : le bison d'Europe (Bison bonasus) et le bison d'Amérique du Nord (Bison bison) qui ...

 

 

Магаданская и Синегорская епархия

Магаданская и Синегорская епархия Троицкий собор в Магадане Страна  Россия Церковь Русская православная церковь Дата основания 31 января 1991 года Управление Главный город Магадан Кафедральный собор Троицкий Иерарх Архиепископ Магаданский и Синегорский Иоанн (Павлих�...

Batman

Comic book superhero This article is about the superhero. For the city in Turkey, see Batman, Turkey. For other uses, see Batman (disambiguation). For people with the surname Batman, see Batman (surname). For the composer with a similar surname, see Jacques-Louis Battmann. Comics character BatmanCover of the DC Comics Absolute Edition of Batman: Hush (2011)Art by Jim LeePublication informationPublisherDC ComicsFirst appearanceDetective Comics #27(cover-dated May 1939; published March 30, 1939...

 

 

List of pre-modern Iranian scientists and scholars

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: List of pre-modern Iranian scientists and scholars – news · newspapers · books · scholar · JSTOR (June 2021) (Learn how and when to remove this message) Photo taken from medieval manuscript by Qutb al-Din al-Shirazi. The image depicts an epicyclic planetary mo...

 

 

World war

For other uses, see World war (disambiguation). United States Army infantry supported by a M18 tank destroyer advancing through an enemy-occupied town during World War II, the most recent conflict to widely be considered a world warWar involving major global states Part of a series onWarOutline History Prehistoric Ancient Post-classical castles Early modern pike and shot napoleonic Late modern industrial fourth-gen Military Organization Command and control Defense ministry Army Navy Air force...

Locust Street

Major thoroughfare in Philadelphia Locust Street12–13th & Locust station on Locust Street in April 2017Part ofPhiladelphia, Pennsylvania, U.S.Maintained byPennDOT and City of PhiladelphiaCoordinates39°56′55″N 75°10′05″W / 39.948544°N 75.167946°W / 39.948544; -75.167946 Locust Street is a major historic street in Center City Philadelphia. The street is the location of several prominent Philadelphia-based buildings, historic sights, and high-rise reside...

 

 

Ratification of the United States Constitution by Rhode Island

1790 decision Rhode Island The ratification of the United States Constitution by Rhode Island was the 1790 decision by the State of Rhode Island and Providence Plantations (Rhode Island) to accede to the United States Constitution. It was a controversial process which occurred only after the United States threatened a trade embargo against Rhode Island for non-compliance. Background Scene at the Signing of the Constitution of the United States, a 1940 painting by Howard Chandler Christy depic...

 

 

محاسبة

  لمعانٍ أخرى، طالع محاسبة (توضيح). جزء من سلسلة مقالات حولالمحاسبة الأنواع الرئيسية تدقيق موازنة تكاليف جنائية مالية التمويل عامة إدارية اجتماعية ضريبية المفاهيم الأساسية الفترة المحاسبية تزايد القوة الشرائية الثابتة كيان اقتصادي قيمة عادلة فرض الاستمرارية التكلف...

Tempêtes du Cap Hatteras

Pour les articles homonymes, voir Tempête (homonymie) et Hatteras. Image satellitaire de la tempête du Cap Hatteras qui causa un blizzard en 2006. Noter l'œil qui la fait ressembler à un ouragan. Une tempête du Cap Hatteras, appelée nor'easter ou northeaster (tempête du nordet) par les Américains et Canadiens anglais, est une dépression des latitudes moyennes en développement rapide qui longe la côte Est de l'Amérique du Nord. Le nom francophone de ce type de bombe météorologiq...

 

 

Asia (Roman province)

Roman province located in modern-day Turkey and Greece For other uses, see Asia (disambiguation). Provincia Asiaἐπαρχία ἈσίαςProvince of the Roman Empire133 BC–7th centuryThe province of Asia highlighted within the Roman Empire.CapitalPergamon(modern Bergama, Turkey), later moved to Ephesus(modern Selçuk, Turkey)Historical eraClassical Antiquity - Late Antiquity• Conquest of Pergamon 133 BC• Division by Diocletian c. 293• Anatolic Theme established 7th ce...

 

 

Date Sōdō

Noble family dispute within the Date samurai clan, which occurred in 1671. This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources.Find sources: Date Sōdō – news · newspapers · books · scholar · JSTOR (October 2023) The Date Sōdō (伊達騒動), or Date Disturbance, was a noble family dispute within the Date samura...

Kvemo Kartli

Kvemo Kartli ქვემო ქართლიMkhareCountry GeorgiaIbu kotaRustaviSubdivisi Daftar 1 kota, 6 distrik Pemerintahan • GubernurPaata Khizanashvili[1]Luas • Total6,528 km2 (2,520 sq mi)Populasi (2014) • Total423,986 • Kepadatan65/km2 (170/sq mi)Kode ISO 3166GE-KKIPM (2017)0.726[2]high · 10th Kvemo Kartli (bahasa Georgia: ქვემო ქართლი; bahasa Azerbaijan: Aş...

 

 

Élections législatives de 2007 dans la Sarthe

2002 2012 Élections législatives de 2007 dans la Sarthe 5 sièges de députés à l'Assemblée nationale 10 et 17 juin 2007 Corps électoral et résultats Inscrits au 1er tour 402 522 Votants au 1er tour 246 405   61,22 %  2,3 Votes exprimés au 1er tour 240 067 Inscrits au 2d tour 324 466 Votants au 2d tour 187 698   57,85 % Votes exprimés au 2d tour 182 495 Majorité présidentielle Liste Union pour un mouvement populaireNouveau...

 

 

James White's Fort

18th century fort and settlement White's Fort redirects here. For the French and Indian War fort, see White's Fort (Hayfield, Virginia). James White home in Knoxville James White's Fort, also known as White's Fort, was an 18th-century fort and settlement that became Knoxville, Tennessee, in the United States. The settlement of White's Fort began in 1786 by James White, a militia officer during the American Revolutionary War. When William Blount, the territorial governor of the Southwest Terri...

Hyperkalemia

Excess potassium in the blood Medical conditionHyperkalemiaOther namesHyperkalaemiaElectrocardiography showing precordial leads in hyperkalemia.Pronunciation/ˌhaɪpərkeɪˈliːmiə/ SpecialtyCritical care medicine, nephrologySymptomsPalpitations, muscle pain, muscle weakness, numbness[1][2]ComplicationsCardiac arrest[1][3]CausesKidney failure, hypoaldosteronism, rhabdomyolysis, certain medications[1]Diagnostic methodBlood potassium > 5.5 ...

 

 

Battle of Molins de Rei

1808 battle during the Peninsular War This article is about the battle in 1808. For the battle in 1847, see Battle of Molino del Rey. Battle of Molins de ReiPart of Peninsular WarPicture of the Battle of Molins de Rei shows the Pont del Diable in the background. The bridge is actually 12 km. north of Molins de Rei in Martorell.Date21 December 1808LocationMolins de Rei, Catalonia, Spain41°24′50″N 2°0′57″E / 41.41389°N 2.01583°E / 41.41389; 2.01583Result...