Move shells page into technologies overview, remove outdated links (#…

…20395)

files/en-us/_redirects.txt

@@ -4705,7 +4705,7 @@
 /en-US/docs/JavaScript/Reference/default_parameters	/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters
 /en-US/docs/JavaScript/Reference/rest_parameters	/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters
 /en-US/docs/JavaScript/Same_origin_policy_for_JavaScript	/en-US/docs/Web/Security/Same-origin_policy
-/en-US/docs/JavaScript/Shells	/en-US/docs/Web/JavaScript/Shells
+/en-US/docs/JavaScript/Shells	/en-US/docs/Web/JavaScript/JavaScript_technologies_overview
 /en-US/docs/JavaScript/Strict_mode	/en-US/docs/Web/JavaScript/Reference/Strict_mode
 /en-US/docs/JavaScript/Typed_arrays	/en-US/docs/Web/JavaScript/Typed_arrays
 /en-US/docs/JavaScript/Typed_arrays/ArrayBuffer	/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer
@@ -5144,12 +5144,12 @@
 /en-US/docs/JavaScript_Documention/Reference/Statements/with	/en-US/docs/Web/JavaScript/Reference/Statements/with
 /en-US/docs/JavaScript_Documention/Reference/Symbols	/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol
 /en-US/docs/JavaScript_Documention/Reference/rest_parameters	/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters
-/en-US/docs/JavaScript_Documention/Shells	/en-US/docs/Web/JavaScript/Shells
+/en-US/docs/JavaScript_Documention/Shells	/en-US/docs/Web/JavaScript/JavaScript_technologies_overview
 /en-US/docs/JavaScript_Language_Resources	/en-US/docs/Web/JavaScript/JavaScript_technologies_overview
 /en-US/docs/JavaScript_Methods_Index	/en-US/docs/Web/JavaScript/Reference
 /en-US/docs/JavaScript_Methods_Index_(Alphabetical)	/en-US/docs/Web/JavaScript/Reference
 /en-US/docs/JavaScript_Properties_Index	/en-US/docs/Web/JavaScript/Reference
-/en-US/docs/JavaScript_shells	/en-US/docs/Web/JavaScript/Shells
+/en-US/docs/JavaScript_shells	/en-US/docs/Web/JavaScript/JavaScript_technologies_overview
 /en-US/docs/JavaScript_technologies_overview	/en-US/docs/Web/JavaScript/JavaScript_technologies_overview
 /en-US/docs/JavaScript_templates	/en-US/docs/Web/JavaScript/Reference/Template_literals
 /en-US/docs/JavaScript_typed_arrays	/en-US/docs/Web/JavaScript/Typed_arrays
@@ -12279,6 +12279,7 @@
 /en-US/docs/Web/JavaScript/Reference/rest_parameters	/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters
 /en-US/docs/Web/JavaScript/Reference/template_strings	/en-US/docs/Web/JavaScript/Reference/Template_literals
 /en-US/docs/Web/JavaScript/Same_origin_policy_for_JavaScript	/en-US/docs/Web/Security/Same-origin_policy
+/en-US/docs/Web/JavaScript/Shells	/en-US/docs/Web/JavaScript/JavaScript_technologies_overview
 /en-US/docs/Web/JavaScript/The_performance_hazards_of__[[Prototype]]_mutation	/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf
 /en-US/docs/Web/JavaScript/The_performance_hazards_of_prototype_mutation	/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf
 /en-US/docs/Web/JavaScript/Tutorials	/en-US/docs/Web/JavaScript

files/en-us/_wikihistory.json

@@ -126525,57 +126525,6 @@
     "modified": "2020-10-15T21:51:43.555Z",
     "contributors": ["fscholz", "wbamberg", "fkling42", "Sheppy"]
   },
-  "Web/JavaScript/Shells": {
-    "modified": "2020-09-13T02:19:59.158Z",
-    "contributors": [
-      "veganaiZe",
-      "fscholz",
-      "jswisher",
-      "chrisdavidmills",
-      "Joelkaba",
-      "ricardodelavega",
-      "utkarshbhatt12",
-      "SphinxKnight",
-      "sonymoon",
-      "kdex",
-      "iskitz",
-      "mamptecnocrata",
-      "Matthisk",
-      "jhnstn",
-      "msalamon",
-      "xfq",
-      "Delapouite",
-      "aloha",
-      "tracker1",
-      "Sheppy",
-      "ziyunfei",
-      "shirayuki",
-      "julienw",
-      "venesa",
-      "jbuck",
-      "SiPlus",
-      "MatrixFrog",
-      "vipsoft",
-      "satyr",
-      "jls",
-      "user01",
-      "sortiz",
-      "Sephr",
-      "kbrosnan",
-      "Shantirao",
-      "Mgjbot",
-      "Brettz9",
-      "Rudolf.noe",
-      "Sevenspade",
-      "Indiejade",
-      "Varmaa",
-      "Uncle billy",
-      "Taken",
-      "Nickolay",
-      "Azer",
-      "Hamstersoup"
-    ]
-  },
   "Web/JavaScript/Typed_arrays": {
     "modified": "2020-10-15T21:04:01.905Z",
     "contributors": [

files/en-us/web/javascript/index.md

@@ -53,8 +53,8 @@ Head over to our [Learning Area JavaScript topic](/en-US/docs/Learn/JavaScript)
 
 - [Understanding client-side JavaScript frameworks](/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks)
   - : JavaScript frameworks are an essential part of modern front-end web development, providing developers with proven tools for building scalable, interactive web applications. This module gives you some fundamental background knowledge about how client-side frameworks work and how they fit into your toolset, before moving on to a series of tutorials covering some of today's most popular ones.
-- [A re-introduction to JavaScript](/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript)
-  - : An overview for those who _think_ they know JavaScript.
+- [JavaScript language overview](/en-US/docs/Web/JavaScript/Language_overview)
+  - : An overview of the basic syntax and semantics of JavaScript for those coming from other programming languages to get up to speed.
 - [JavaScript data structures](/en-US/docs/Web/JavaScript/Data_structures)
   - : Overview of available data structures in JavaScript.
 - [Equality comparisons and sameness](/en-US/docs/Web/JavaScript/Equality_comparisons_and_sameness)
@@ -94,7 +94,7 @@ Helpful tools for writing and debugging your **JavaScript** code.
 
 - [Firefox Developer Tools](https://firefox-source-docs.mozilla.org/devtools-user/index.html)
   - : [Web Console](https://firefox-source-docs.mozilla.org/devtools-user/web_console/index.html), [JavaScript Profiler](https://firefox-source-docs.mozilla.org/devtools-user/performance/index.html), [Debugger](https://firefox-source-docs.mozilla.org/devtools-user/debugger/index.html), and more.
-- [JavaScript Shells](/en-US/docs/Web/JavaScript/Shells)
+- [JavaScript Shells](/en-US/docs/Web/JavaScript/JavaScript_technologies_overview#shells)
   - : A JavaScript shell allows you to quickly test snippets of JavaScript code.
 - [Learn JavaScript](https://learnjavascript.online/)
   - : An excellent resource for aspiring web developers — Learn JavaScript in an interactive environment, with short lessons and interactive tests, guided by automated assessment. The first 40 lessons are free, and the complete course is available for a small one-time payment.

files/en-us/web/javascript/javascript_technologies_overview/index.md

@@ -7,6 +7,7 @@ tags:
   - Guide
   - JavaScript
 ---
+
 {{JsSidebar("Introductory")}}
 
 Whereas [HTML](/en-US/docs/Web/HTML) defines a webpage's structure and content and [CSS](/en-US/docs/Web/CSS) sets the formatting and appearance, [JavaScript](/en-US/docs/Web/JavaScript) adds interactivity to a webpage and creates rich web applications.
@@ -96,3 +97,23 @@ Looking for the [`Document`](/en-US/docs/Web/API/Document) object, [`Window`](/e
 - The [WebAssembly interface](https://webassembly.github.io/spec/js-api) provides utilities for communication between JavaScript code and [WebAssembly](/en-US/docs/WebAssembly) modules.
 
 Non-browser environments (like Node.js) often do not have DOM APIs — because they don't interact with a document — but they still usually implement many web APIs, such as [`fetch()`](/en-US/docs/Web/API/fetch) and [`setTimeout()`](/en-US/docs/Web/API/setTimeout).
+
+## Shells
+
+A JavaScript shell allows you to quickly test snippets of JavaScript code without having to reload a web page. They are extremely useful for developing and debugging code.
+
+### Standalone JavaScript shells
+
+The following JavaScript shells are stand-alone environments, like Perl or Python.
+
+- [Node.js](https://nodejs.org/) - Node.js is a platform for easily building fast, scalable network applications.
+- [GraalJS](https://www.graalvm.org/) - A high performance implementation of the JavaScript programming language. Built on the GraalVM by Oracle Labs.
+- [ShellJS](https://github.com/shelljs/shelljs) - Portable Unix shell commands for Node.js.
+
+### Browser-based JavaScript shells
+
+The following JavaScript shells run code through the browser's JavaScript engine.
+
+- Firefox has a [built-in JavaScript console](https://firefox-source-docs.mozilla.org/devtools-user/web_console/the_command_line_interpreter/index.html), which support multi-line editing.
+- [Babel REPL](https://babeljs.io/repl) - A browser-based [REPL](https://en.wikipedia.org/wiki/REPL) for experimenting with future JavaScript.
+- [TypeScript playground](https://www.typescriptlang.org/play) — A browser-based playground for experimenting both new JavaScript features (via the tsc compiler) and TypeScript syntax.