I recently had to format large numbers using JavaScript and was really missing Rails’ number_with_delimiter function. Heres a simple version for JavaScript.
// 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();
}