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Cross-browser Array.prototype.unique
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| Array.prototype.unique = | |
| function() | |
| { | |
| for(var | |
| a = this.slice().sort(), // sort this array | |
| c = a.length, // length of sorted array | |
| b = []; // result array | |
| c--; // loop | |
| a[c] === a[c-1] || // if current item is equal with neighbor, do not | |
| b.push(a[c]) // push it | |
| ); | |
| return b; // return the result | |
| } |
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| // 122 bytes | |
| Array.prototype.unique=function(){for(var a=this.slice().sort(),b=[],c=a.length;c--;a[c]===a[c-1]||b.push(a[c]));return b} |
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| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE> | |
| Everyone is permitted to copy and distribute verbatim or modified | |
| copies of this license document, and changing it is allowed as long | |
| as the name is changed. | |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
| 0. You just DO WHAT THE FUCK YOU WANT TO. |
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| { | |
| "name": "Cross-browser Array.prototype.unique", | |
| "keywords": [ | |
| "array", | |
| "unique", | |
| "sort" | |
| ] | |
| } |
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| <!DOCTYPE html> | |
| <title>Foo</title> | |
| <div>Expected value: <b>undefined</b></div> | |
| <div>Actual value: <b id="ret"></b></div> | |
| <script> | |
| Array.prototype.unique=function(){for(var a=this.slice().sort(),b=[],c=a.length;c--;a[c]===a[c-1]||b.push(a[c]));return b} | |
| var arr = ['f','h','j','s','h','f','j','s','h','f','g','a','h','s','f','i','a','h','f','i','w','a','o','h','f','p','a','f','h','d','s','f','j','h']; | |
| document.getElementById( "ret" ).innerHTML = arr.unique().join(', '); | |
| </script> |
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Array.filter() is ES5 according to MDN.