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guide/english/javascript/functions-list/index.md

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+---
+title: Functions List
+---
+![Unofficial JS Logo](//discourse-user-assets.s3.amazonaws.com/original/2X/0/0584980f425bfbbe1e14001557ff4f5bab8f61ec.jpg)
+
+JavaScript (JS) is a lightweight, interpreted, programming language with first-class functions. Most well-known as the scripting language for Web pages, many non-browser environments also use it, such as <a href='https://nodejs.org' target='_blank' rel='nofollow'>node.js</a> and <a href='http://couchdb.apache.org/' target='_blank' rel='nofollow'>Apache CouchDB</a>. JS is a prototype-based, multi-paradigm, dynamic scripting language, supporting object-oriented, imperative, and declarative (e.g. functional programming) styles.
+
+JavaScript runs on the client side of the web, which can be used to design / program how the web pages behave on the occurrence of an event. JavaScript is an easy to learn and also powerful scripting language, widely used for controlling web page behaviour.
+
+Checkout <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript' target='_blank' rel='nofollow'>MDN's JavaScript Docs</a>, they are a great asset in learning.
+
+We also have some great articles on our wiki:  
+- <a href='http://forum.freecodecamp.com/t/advantages-and-disadvantages-of-javascript/14280' target='_blank' rel='nofollow'>Advantages and Disadvantages of JavaScript</a>  
+- **JavaScript Data Types:**  
+- <a href='http://forum.freecodecamp.com/t/javascript-boolean/14311' target='_blank' rel='nofollow'>Booleans</a>  
+- **JavaScript Strings:**  
+- <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-charat/15932' target='_blank' rel='nofollow'>String.prototype.charAt()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-charcodeat/15933' target='_blank' rel='nofollow'>String.prototype.charCodeAt()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-concat/15935' target='_blank' rel='nofollow'>String.prototype.concat()</a>  
+- <a href='https://forum.freecodecamp.org/t/javascript-string-prototype-indexof/15936' target='_blank' rel='nofollow'>String.prototype.indexOf()</a>  
+- <a href='http://forum.freecodecamp.com/t/string-prototype-lastindexof/15939' target='_blank' rel='nofollow'>String.prototype.lastIndexOf()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-match/15941' target='_blank' rel='nofollow'>String.prototype.match()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-replace/15942' target='_blank' rel='nofollow'>String.prototype.replace()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-slice/15943' target='_blank' rel='nofollow'>String.prototype.slice()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-split/15944' target='_blank' rel='nofollow'>String.prototype.split()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-substr/15945' target='_blank' rel='nofollow'>String.prototype.substr()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-substring/15947' target='_blank' rel='nofollow'>String.prototype.substring()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-tolowercase/15948' target='_blank' rel='nofollow'>String.prototype.toLowerCase()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-touppercase/15950' target='_blank' rel='nofollow'>String.prototype.toUpperCase()</a>  
+- **JavaScript Arrays:**  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-isarray/14284' target='_blank' rel='nofollow'>Array.isArray()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-concat/14286' target='_blank' rel='nofollow'>Array.prototype.concat()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-every/14287' target='_blank' rel='nofollow'>Array.prototype.every()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-filter/14289' target='_blank' rel='nofollow'>Array.prototype.filter()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-foreach/14290' target='_blank' rel='nofollow'>Array.prototype.forEach()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-indexof/14291' target='_blank' rel='nofollow'>Array.prototype.indexOf()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-join/14292' target='_blank' rel='nofollow'>Array.prototype.join()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-lastindexof/14293' target='_blank' rel='nofollow'>Array.prototype.lastIndexOf()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-map/14294' target='_blank' rel='nofollow'>Array.prototype.map()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-pop/14296' target='_blank' rel='nofollow'>Array.prototype.pop()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-push/14298' target='_blank' rel='nofollow'>Array.prototype.push()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-reduce/14299' target='_blank' rel='nofollow'>Array.prototype.reduce()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-reverse/14300' target='_blank' rel='nofollow'>Array.prototype.reverse()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-shift/14301' target='_blank' rel='nofollow'>Array.prototype.shift()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-slice/14302' target='_blank' rel='nofollow'>Array.prototype.slice()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-some/14304' target='_blank' rel='nofollow'>Array.prototype.some()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-sort/14306' target='_blank' rel='nofollow'>Array.prototype.sort()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-splice/14307' target='_blank' rel='nofollow'>Array.prototype.splice()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-tostring/14308' target='_blank' rel='nofollow'>Array.prototype.toString()</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-unshift/14309' target='_blank' rel='nofollow'>Array.prototype.unshift()</a>  
+- **JavaScript Loops:**  
+- <a href='http://forum.freecodecamp.com/t/javascript-loops/14681' target='_blank' rel='nofollow'>Loops</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-while-loop/14668' target='_blank' rel='nofollow'>While Loop</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-do-while-loop/14662' target='_blank' rel='nofollow'>Do While Loop</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-for-loop/14666' target='_blank' rel='nofollow'>For Loop</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-for-in-loop/14665' target='_blank' rel='nofollow'>For In Loop</a>  
+- <a href='http://forum.freecodecamp.com/t/javascript-for-of-loop/14671' target='_blank' rel='nofollow'>For Of Loop</a>
+
+Checkout our other articles on JavaScript: <a href='https://www.freecodecamp.com/wiki' target='_blank' rel='nofollow'>https://www.freecodecamp.com/wiki</a>.