Comma separate strings and numbers in JavaScript

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I recently had to format large numbers using JavaScript and was really missing Rails' numberwithdelimiter function. Heres a simple version for JavaScript.

File: any.js ------------ // Allow strings to number_to_currency style comma seperate String.prototype.commafy = function () { return this.replace(/(^|[^\w.])(\d{4,})/g, function($0, $1, $2) { return $1 + $2.replace(/\d(?=(?:\d\d\d)+(?!\d))/g, "$&,"); }); } // Convenience method for numbers Number.prototype.commafy = function () { return String(this).commafy(); }

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Rob Hurring is a software engineer residing in the NJ tri-state area. He spends most of his time writing Ruby and JavaScript code and hacking on whatever he finds neat.