programming-books/free-programming-playgrounds.md

### Index

* [Angular](#angular)
* [ClojureScript](#clojurescript)
* [Crystal](#crystal)
* [CSS](#css)
* [Dart](#dart)
* [Docker](#docker)
* [Elm](#elm)
* [Flutter](#flutter)
* [Go](#go)
* [Haskell](#haskell)
* [Ionic](#ionic)
* [Java](#java)
* [JavaScript](#javascript)
* [Kotlin](#kotlin)
* [Kubernetes](#kubernetes)
* [.Net](#dotnet)
* [Node.js](#nodejs)
* [OCaml](#ocaml)
* [Perl](#perl)
* [PHP](#php)
* [Python](#python)
* [R](#r)
* [React](#react)
* [Redis](#redis)
* [Ruby](#ruby)
* [Rust](#rust)
* [RxJS](#rxjs)
* [Scala](#scala)
* [SQL](#sql)
* [Svelte](#svelte)
* [Swift](#swift)
* [TypeScript](#typescript)


### Angular

* [Plunker](http://plnkr.co)
* [StackBlitz](https://stackblitz.com/fork/angular)


### ClojureScript

* [Web REPL](http://clojurescript.net)


### Crystal

* [Compile & run code in Crystal](https://play.crystal-lang.org/#/cr)


### CSS

* [CodePen](https://codepen.io)
* [CSSdeck](http://cssdeck.com)
* [CSSdesk](http://cssdesk.com)
* [Dabblet](http://dabblet.com)
* [Flexy Boxes](http://the-echoplex.net/flexyboxes/)


### Dart

* [DartPad](https://dartpad.dev)


### Docker

* [Katakoda](https://www.katacoda.com/courses/docker/playground)
* [Play with Docker](https://labs.play-with-docker.com)


### Elm

* [Ellie](https://ellie-app.com)


### Flutter

* [Codepen](https://codepen.io/topic/flutter/templates)


### Go

* [Go Playground](https://play.golang.org)


### Haskell

* [Try Haskell](https://www.tryhaskell.org)


### Ionic

* [StackBlitz](https://stackblitz.com/fork/ionic)


### Java

* [repl.it](https://repl.it) (_including a separate Java/Swing_)


### JavaScript

* [CodePen](https://codepen.io)
* [CodeSandbox.io](https://codesandbox.io)
* [JSBin](http://jsbin.com)
* [JSFiddle](http://jsfiddle.net)
* [Plunker](http://plnkr.co)
* [Sololearn](https://code.sololearn.com/#html)


### Kotlin

* [Kotlin](https://play.kotlinlang.org)


### Kubernetes

* [Katakoda](https://www.katacoda.com/courses/kubernetes/playground)
* [Play with Kubernetes](https://labs.play-with-k8s.com)


### <a name="dotnet"></a>.NET

* [.NET Fiddle](https://dotnetfiddle.net)


### NodeJS

* [Ideone](http://ideone.com)


### OCaml

* [Try OCaml](https://try.ocamlpro.com)


### Perl

* [Perl](http://tryperl.pl)


### PHP

* [Codepad](http://codepad.org)
* [PHPFiddle](http://phpfiddle.org)
* [PHPTester](http://phptester.net)


### Python

* [Codepad](http://codepad.org)
* [Python Trinket](https://trinket.io/python)
* [Python.org Shell](https://www.python.org/shell)


### R

* [R-Fiddle](http://www.r-fiddle.org)


### React

* [CodeSandbox.io](https://codesandbox.io)
* [jscomplete](https://jscomplete.com/playground)
* [StackBlitz](https://stackblitz.com/fork/react)


### Redis

* [Try Redis](https://try.redis.io)


### Ruby

* [Codepad](http://codepad.org)


### Rust

* [Rust Playground](http://play.integer32.com)


### RxJS

* [StackBlitz](https://stackblitz.com/fork/rxjs)


### Scala

* [ScalaFiddle.io](https://scalafiddle.io)
* [ScalaFiddle.net](http://scalafiddle.net)
* [Scastie](https://scastie.scala-lang.org)


### SQL

* [Extends Class](https://extendsclass.com/sqlite-browser.html)
* [SQLFiddle](http://sqlfiddle.com)


### Svelte

* [StackBlitz](https://stackblitz.com/fork/svelte)
* [Svelte REPL](https://svelte.dev/repl)


### Swift

* [Online Swift Playground](http://online.swiftplayground.run)


### TypeScript

* [Playground](https://www.typescriptlang.org/play/index.html)
* [StackBlitz](https://stackblitz.com/fork/typescript)
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00			`### Index`

			`* [Angular](#angular)`
Update free-programming-playgrounds.md (#2754) * Update free-programming-playgrounds.md * remove trailing slash 2018-03-04 19:53:34 +00:00			`* [ClojureScript](#clojurescript)`
Add free playgrounds for Crystal 2017-02-21 01:45:53 +00:00			`* [Crystal](#crystal)`
Fix formatting 2017-04-23 12:35:25 +00:00			`* [CSS](#css)`
Add Playground Reference Site for Dart & Flutter (#3778) * Add Playground Reference Site for Dart & Flutter * fix format * Fix url dartpad.dev format * Fix lint 2020-10-06 13:49:29 +00:00			`* [Dart](#dart)`
add: kubernetes and docker play grounds (#3720) * add: kubernetes and docker play grounds * fix: sorting in alphabetical order * fix: remove trailing slash 2020-10-02 15:11:45 +00:00			`* [Docker](#docker)`
Elm language resources added (#3054) * added Solidity * added Solidity * added Solidity * bitcoin book added * fixed ordering on bitcoin book entry * added authors for bitcoin and solidity books * added Bitcoin and cryptocurrency Princeton book * elm interactive playground added (ellie) * free elm books added * elm podcast added * corrected spacing * reordered elm books into existing category * reordered format and author * removed trailing /s * fixed alphabetical ordering 2018-11-06 14:22:08 +00:00			`* [Elm](#elm)`
Add Playground Reference Site for Dart & Flutter (#3778) * Add Playground Reference Site for Dart & Flutter * fix format * Fix url dartpad.dev format * Fix lint 2020-10-06 13:49:29 +00:00			`* [Flutter](#flutter)`
Add Go playground (#2531) * Add Go playground * Fix Travis build 2017-09-07 13:42:58 +00:00			`* [Go](#go)`
			`* [Haskell](#haskell)`
Update free-programming-playgrounds.md (#3463) 2019-12-03 14:25:04 +00:00			`* [Ionic](#ionic)`
Update free-programming-playgrounds.md (#3526) * Update free-programming-playgrounds.md Added codesandbox.io under React (and removed the react reference from its listing on JavaScript). Added a Java section and linked to repl.it repl.it actually has sandboxes for most of the languages listed here, and maybe some others, but I didn't add them all in. The Swing support for Java is new, and has some bugs. They didn't respond to my report, so I think they are spread a little thin. * add spaces to satisfy linter * add space to satisfy linter Co-authored-by: Eric Hellman <eric@hellman.net> 2020-02-20 18:56:35 +00:00			`* [Java](#java)`
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00			`* [JavaScript](#javascript)`
Adicionar kotlin (#2607) 2017-10-20 22:57:24 +00:00			`* [Kotlin](#kotlin)`
add: kubernetes and docker play grounds (#3720) * add: kubernetes and docker play grounds * fix: sorting in alphabetical order * fix: remove trailing slash 2020-10-02 15:11:45 +00:00			`* [Kubernetes](#kubernetes)`
added CodeSandbox.io React playground (#2395) Added .NET anchor for TOC link and corrected Try Haskell formatting 2017-06-17 04:04:01 +00:00			`* [.Net](#dotnet)`
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00			`* [Node.js](#nodejs)`
Added OCaml playground (#3067) * Added OCaml playground * delint 2018-12-27 14:43:29 +00:00			`* [OCaml](#ocaml)`
Adds Perl Playground (#2345) Thanks! 2017-05-17 19:16:53 +00:00			`* [Perl](#perl)`
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00			`* [PHP](#php)`
			`* [Python](#python)`
Add R-Fiddle to playgrounds (#2632) Add R section to playground and add R-Fiddle to it. 2017-11-01 13:00:34 +00:00			`* [R](#r)`
Update free-programming-playgrounds.md (#3463) 2019-12-03 14:25:04 +00:00			`* [React](#react)`
Add free-programming-interactive-tutorials-en for Redis (#3847) * Added Redis interactive tutorial * updated docs location 2020-10-10 18:14:17 +00:00			`* [Redis](#redis)`
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00			`* [Ruby](#ruby)`
Adding link to Rust playground (#2390) 2017-06-14 22:06:06 +00:00			`* [Rust](#rust)`
Move a playground link to CSS section (#3697) * Move a playground link to CSS section FlexBox is a CSS feature. This move is consistent with other files. * Fix index in english free-programming-playgrounds * Move a section according to alphabetical order * Remove offline link pyfiddle.io Shutdown confirmed: https://github.com/priyankcommits/pyfiddleio/issues/7 2020-09-03 13:15:01 +00:00			`* [RxJS](#rxjs)`
Update playgrounds (#2985) * Fix playgrounds alphabetical order * Add Scala to playgrounds index * Add online Swift playground 2018-10-08 14:12:20 +00:00			`* [Scala](#scala)`
Fix ordering 2016-12-04 10:19:40 +00:00			`* [SQL](#sql)`
Update free-programming-playgrounds.md (#3463) 2019-12-03 14:25:04 +00:00			`* [Svelte](#svelte)`
Update playgrounds (#2985) * Fix playgrounds alphabetical order * Add Scala to playgrounds index * Add online Swift playground 2018-10-08 14:12:20 +00:00			`* [Swift](#swift)`
Add TypeScript Playground (#3141) 2019-02-15 14:41:42 +00:00			`* [TypeScript](#typescript)`
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00

			`### Angular`

			`* [Plunker](http://plnkr.co)`
Update free-programming-playgrounds.md (#3463) 2019-12-03 14:25:04 +00:00			`* [StackBlitz](https://stackblitz.com/fork/angular)`
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00

Update free-programming-playgrounds.md (#2754) * Update free-programming-playgrounds.md * remove trailing slash 2018-03-04 19:53:34 +00:00			`### ClojureScript`

			`* [Web REPL](http://clojurescript.net)`


Fix formatting 2017-04-23 12:35:25 +00:00			`### Crystal`

			`* [Compile & run code in Crystal](https://play.crystal-lang.org/#/cr)`


Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00			`### CSS`

Point codepen.io link to https (#3138) 2019-02-13 13:20:14 +00:00			`* [CodePen](https://codepen.io)`
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00			`* [CSSdeck](http://cssdeck.com)`
			`* [CSSdesk](http://cssdesk.com)`
			`* [Dabblet](http://dabblet.com)`
Move a playground link to CSS section (#3697) * Move a playground link to CSS section FlexBox is a CSS feature. This move is consistent with other files. * Fix index in english free-programming-playgrounds * Move a section according to alphabetical order * Remove offline link pyfiddle.io Shutdown confirmed: https://github.com/priyankcommits/pyfiddleio/issues/7 2020-09-03 13:15:01 +00:00			`* [Flexy Boxes](http://the-echoplex.net/flexyboxes/)`
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00

Add Playground Reference Site for Dart & Flutter (#3778) * Add Playground Reference Site for Dart & Flutter * fix format * Fix url dartpad.dev format * Fix lint 2020-10-06 13:49:29 +00:00			`### Dart`

			`* [DartPad](https://dartpad.dev)`


add: kubernetes and docker play grounds (#3720) * add: kubernetes and docker play grounds * fix: sorting in alphabetical order * fix: remove trailing slash 2020-10-02 15:11:45 +00:00			`### Docker`

			`* [Katakoda](https://www.katacoda.com/courses/docker/playground)`
			`* [Play with Docker](https://labs.play-with-docker.com)`


Elm language resources added (#3054) * added Solidity * added Solidity * added Solidity * bitcoin book added * fixed ordering on bitcoin book entry * added authors for bitcoin and solidity books * added Bitcoin and cryptocurrency Princeton book * elm interactive playground added (ellie) * free elm books added * elm podcast added * corrected spacing * reordered elm books into existing category * reordered format and author * removed trailing /s * fixed alphabetical ordering 2018-11-06 14:22:08 +00:00			`### Elm`

			`* [Ellie](https://ellie-app.com)`


Add Playground Reference Site for Dart & Flutter (#3778) * Add Playground Reference Site for Dart & Flutter * fix format * Fix url dartpad.dev format * Fix lint 2020-10-06 13:49:29 +00:00			`### Flutter`

			`* [Codepen](https://codepen.io/topic/flutter/templates)`


Add Go playground (#2531) * Add Go playground * Fix Travis build 2017-09-07 13:42:58 +00:00			`### Go`

			`* [Go Playground](https://play.golang.org)`


Add playground section for Haskell (#2344) Thanks! * Add playground section for Haskell Try Haskell https://www.tryhaskell.org/ * following markup rules 2017-05-17 19:15:31 +00:00			`### Haskell`

added CodeSandbox.io React playground (#2395) Added .NET anchor for TOC link and corrected Try Haskell formatting 2017-06-17 04:04:01 +00:00			`* [Try Haskell](https://www.tryhaskell.org)`
Add playground section for Haskell (#2344) Thanks! * Add playground section for Haskell Try Haskell https://www.tryhaskell.org/ * following markup rules 2017-05-17 19:15:31 +00:00

Update free-programming-playgrounds.md (#3463) 2019-12-03 14:25:04 +00:00			`### Ionic`

			`* [StackBlitz](https://stackblitz.com/fork/ionic)`


Update free-programming-playgrounds.md (#3526) * Update free-programming-playgrounds.md Added codesandbox.io under React (and removed the react reference from its listing on JavaScript). Added a Java section and linked to repl.it repl.it actually has sandboxes for most of the languages listed here, and maybe some others, but I didn't add them all in. The Swing support for Java is new, and has some bugs. They didn't respond to my report, so I think they are spread a little thin. * add spaces to satisfy linter * add space to satisfy linter Co-authored-by: Eric Hellman <eric@hellman.net> 2020-02-20 18:56:35 +00:00			`### Java`

			`* [repl.it](https://repl.it) (_including a separate Java/Swing_)`


Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00			`### JavaScript`

Point codepen.io link to https (#3138) 2019-02-13 13:20:14 +00:00			`* [CodePen](https://codepen.io)`
Update free-programming-playgrounds.md (#3526) * Update free-programming-playgrounds.md Added codesandbox.io under React (and removed the react reference from its listing on JavaScript). Added a Java section and linked to repl.it repl.it actually has sandboxes for most of the languages listed here, and maybe some others, but I didn't add them all in. The Swing support for Java is new, and has some bugs. They didn't respond to my report, so I think they are spread a little thin. * add spaces to satisfy linter * add space to satisfy linter Co-authored-by: Eric Hellman <eric@hellman.net> 2020-02-20 18:56:35 +00:00			`* [CodeSandbox.io](https://codesandbox.io)`
added webpack bin, js bin playgrounds (#2478) 2017-06-29 18:52:03 +00:00			`* [JSBin](http://jsbin.com)`
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00			`* [JSFiddle](http://jsfiddle.net)`
			`* [Plunker](http://plnkr.co)`
			`* [Sololearn](https://code.sololearn.com/#html)`


Adicionar kotlin (#2607) 2017-10-20 22:57:24 +00:00			`### Kotlin`

Update kotlin playground (#3705) * Update kotlin playground The current kotlin playground is obsolete. Updated to the new playground link. * remove '/' to satisfy linter Always check the Travis-CI output! Co-authored-by: Eric Hellman <eric@hellman.net> 2020-09-14 16:17:54 +00:00			`* [Kotlin](https://play.kotlinlang.org)`
Adicionar kotlin (#2607) 2017-10-20 22:57:24 +00:00

add: kubernetes and docker play grounds (#3720) * add: kubernetes and docker play grounds * fix: sorting in alphabetical order * fix: remove trailing slash 2020-10-02 15:11:45 +00:00			`### Kubernetes`

			`* [Katakoda](https://www.katacoda.com/courses/kubernetes/playground)`
			`* [Play with Kubernetes](https://labs.play-with-k8s.com)`


added CodeSandbox.io React playground (#2395) Added .NET anchor for TOC link and corrected Try Haskell formatting 2017-06-17 04:04:01 +00:00			`### <a name="dotnet"></a>.NET`
added .net fiddle added .net fiddle for .net lovers 2017-04-07 14:04:19 +00:00
Fix formatting 2017-04-23 12:37:53 +00:00			`* [.NET Fiddle](https://dotnetfiddle.net)`
added .net fiddle added .net fiddle for .net lovers 2017-04-07 14:04:19 +00:00

Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00			`### NodeJS`

			`* [Ideone](http://ideone.com)`


Added OCaml playground (#3067) * Added OCaml playground * delint 2018-12-27 14:43:29 +00:00			`### OCaml`

			`* [Try OCaml](https://try.ocamlpro.com)`


Adds Perl Playground (#2345) Thanks! 2017-05-17 19:16:53 +00:00			`### Perl`

			`* [Perl](http://tryperl.pl)`


Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00			`### PHP`

			`* [Codepad](http://codepad.org)`
			`* [PHPFiddle](http://phpfiddle.org)`
Update free-programming-playgrounds.md (#2225) * Update free-programming-playgrounds.md * Update free-programming-playgrounds.md * Update free-programming-playgrounds.md 2017-01-13 21:56:32 +00:00			`* [PHPTester](http://phptester.net)`
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00

			`### Python`

			`* [Codepad](http://codepad.org)`
Update free-programming-playgrounds.md (#3868) * Update free-programming-playgrounds.md Added python interpreter * Update free-programming-playgrounds.md Fixed linter error 2020-10-10 03:05:39 +00:00			`* [Python Trinket](https://trinket.io/python)`
Update free-programming-playgrounds.md (#3845) Added an interpreter for python 2020-10-09 18:20:05 +00:00			`* [Python.org Shell](https://www.python.org/shell)`
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00

Add R-Fiddle to playgrounds (#2632) Add R section to playground and add R-Fiddle to it. 2017-11-01 13:00:34 +00:00			`### R`

			`* [R-Fiddle](http://www.r-fiddle.org)`


Update free-programming-playgrounds.md (#3463) 2019-12-03 14:25:04 +00:00			`### React`

Update free-programming-playgrounds.md (#3526) * Update free-programming-playgrounds.md Added codesandbox.io under React (and removed the react reference from its listing on JavaScript). Added a Java section and linked to repl.it repl.it actually has sandboxes for most of the languages listed here, and maybe some others, but I didn't add them all in. The Swing support for Java is new, and has some bugs. They didn't respond to my report, so I think they are spread a little thin. * add spaces to satisfy linter * add space to satisfy linter Co-authored-by: Eric Hellman <eric@hellman.net> 2020-02-20 18:56:35 +00:00			`* [CodeSandbox.io](https://codesandbox.io)`
Follow up old PRs (#4008) * Add "What I Wish I Knew When Learning Haskell" Follow up #3173. * Update free-programming-books-zh.md Follow up #3330. * added competitive programming link Follow up #3398. 2020-10-13 13:49:52 +00:00			`* [jscomplete](https://jscomplete.com/playground)`
Update free-programming-playgrounds.md (#3463) 2019-12-03 14:25:04 +00:00			`* [StackBlitz](https://stackblitz.com/fork/react)`


Add free-programming-interactive-tutorials-en for Redis (#3847) * Added Redis interactive tutorial * updated docs location 2020-10-10 18:14:17 +00:00			`### Redis`

			`* [Try Redis](https://try.redis.io)`


Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00			`### Ruby`

			`* [Codepad](http://codepad.org)`


Move a playground link to CSS section (#3697) * Move a playground link to CSS section FlexBox is a CSS feature. This move is consistent with other files. * Fix index in english free-programming-playgrounds * Move a section according to alphabetical order * Remove offline link pyfiddle.io Shutdown confirmed: https://github.com/priyankcommits/pyfiddleio/issues/7 2020-09-03 13:15:01 +00:00			`### Rust`
Update free-programming-playgrounds.md (#3463) 2019-12-03 14:25:04 +00:00
Move a playground link to CSS section (#3697) * Move a playground link to CSS section FlexBox is a CSS feature. This move is consistent with other files. * Fix index in english free-programming-playgrounds * Move a section according to alphabetical order * Remove offline link pyfiddle.io Shutdown confirmed: https://github.com/priyankcommits/pyfiddleio/issues/7 2020-09-03 13:15:01 +00:00			`* [Rust Playground](http://play.integer32.com)`
Update free-programming-playgrounds.md (#3463) 2019-12-03 14:25:04 +00:00

Move a playground link to CSS section (#3697) * Move a playground link to CSS section FlexBox is a CSS feature. This move is consistent with other files. * Fix index in english free-programming-playgrounds * Move a section according to alphabetical order * Remove offline link pyfiddle.io Shutdown confirmed: https://github.com/priyankcommits/pyfiddleio/issues/7 2020-09-03 13:15:01 +00:00			`### RxJS`
Update free-programming-playgrounds.md (#2225) * Update free-programming-playgrounds.md * Update free-programming-playgrounds.md * Update free-programming-playgrounds.md 2017-01-13 21:56:32 +00:00
Move a playground link to CSS section (#3697) * Move a playground link to CSS section FlexBox is a CSS feature. This move is consistent with other files. * Fix index in english free-programming-playgrounds * Move a section according to alphabetical order * Remove offline link pyfiddle.io Shutdown confirmed: https://github.com/priyankcommits/pyfiddleio/issues/7 2020-09-03 13:15:01 +00:00			`* [StackBlitz](https://stackblitz.com/fork/rxjs)`
Update free-programming-playgrounds.md (#2225) * Update free-programming-playgrounds.md * Update free-programming-playgrounds.md * Update free-programming-playgrounds.md 2017-01-13 21:56:32 +00:00

added ScalaFiddle (s) (#2220) added ScalaFiddle (s) 2017-02-04 10:22:01 +00:00			`### Scala`

Formatting 2017-02-04 10:27:38 +00:00			`* [ScalaFiddle.io](https://scalafiddle.io)`
			`* [ScalaFiddle.net](http://scalafiddle.net)`
Add Scastie (#2702) * Add Scastie * Fix 'Remove trailing slash' warning 2018-02-01 14:52:14 +00:00			`* [Scastie](https://scastie.scala-lang.org)`
Added new section for free programming playgrounds (#2148) 2016-11-03 22:07:15 +00:00
Update playgrounds (#2985) * Fix playgrounds alphabetical order * Add Scala to playgrounds index * Add online Swift playground 2018-10-08 14:12:20 +00:00
			`### SQL`

add a sqlite fiddle (#3097) add sqlite fiddle in SQL 2019-01-11 14:59:59 +00:00			`* [Extends Class](https://extendsclass.com/sqlite-browser.html)`
Update playgrounds (#2985) * Fix playgrounds alphabetical order * Add Scala to playgrounds index * Add online Swift playground 2018-10-08 14:12:20 +00:00			`* [SQLFiddle](http://sqlfiddle.com)`


Update free-programming-playgrounds.md (#3463) 2019-12-03 14:25:04 +00:00			`### Svelte`

			`* [StackBlitz](https://stackblitz.com/fork/svelte)`
Add new playground resource on Svelte (#3875) 2020-10-10 03:13:53 +00:00			`* [Svelte REPL](https://svelte.dev/repl)`
Update free-programming-playgrounds.md (#3463) 2019-12-03 14:25:04 +00:00

Update playgrounds (#2985) * Fix playgrounds alphabetical order * Add Scala to playgrounds index * Add online Swift playground 2018-10-08 14:12:20 +00:00			`### Swift`

			`* [Online Swift Playground](http://online.swiftplayground.run)`
Add TypeScript Playground (#3141) 2019-02-15 14:41:42 +00:00

			`### TypeScript`

			`* [Playground](https://www.typescriptlang.org/play/index.html)`
Update free-programming-playgrounds.md (#3463) 2019-12-03 14:25:04 +00:00			`* [StackBlitz](https://stackblitz.com/fork/typescript)`