String trim methods polyfill for 140byt.es
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String trim methods polyfill for 140byt.es
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| !function( | |
| a, // trimming object that defined String.prototype extensions and their related Regular Expressions | |
| b // placeholder variable for iterating over 'a' | |
| ){ | |
| for(b in a) // iterate over each of the trimming items in 'a' | |
| String.prototype[b]=b[b] || // use the native string trim/trimLeft/trimRight method if available, if not: | |
| Function('return this.replace('+a[b]+',"")') // generate a function that will return a new string that replaces the relevant whitespace | |
| }({ | |
| trimLeft: /^\s+/, // regex to trim the left side of a string (along with prototype name) | |
| trimRight: /\s+$/ // regex to trim the right side of a string (along with prototype name) | |
| }) |
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| !function(a,b){for(b in a)String.prototype[b]=b[b]||Function('return this.replace('+a[b]+',"")')}({trimLeft:/^\s+/,trimRight:/\s+$/}) |
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| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2011 Eli Perelman <http://eliperelman.com> | |
| 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": "StringPolyfillTrimmingMethods", | |
| "description": "String polyfill trimming methods for non-ECMAScript5 environments", | |
| "keywords": [ | |
| "string", | |
| "prototype", | |
| "trim", | |
| "polyfill", | |
| "ecmascript5" | |
| ] | |
| } |
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| <!DOCTYPE html> | |
| <title>String polyfill trimming methods</title> | |
| <script> | |
| !function(a,b){for(b in a)String.prototype[b]=[b]||Function('return this.replace('+a[b]+',"")')}({trimLeft:/^\s+/,trimRight:/\s+$/,trim:/^\s+|\s+$/g}) | |
| var str = ' my awesome string '; | |
| // outputs: 'my awesome string ' | |
| console.log(str.trimLeft()); | |
| // outputs: ' my awesome string' | |
| console.log(str.trimRight()); | |
| </script> |
D’oh.
The whitespace included in the character class \s is inconsistent across browsers. Instead a manual check of the required whitespace - is - best.
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@mathiasbynens another gotcha is the escaping:
will turn into
'/^s+/'