Format JS

format.js

String.prototype.format = String.prototype.format ||
function () {
    "use strict";
    var str = this.toString();
    if (arguments.length) {
        var t = typeof arguments[0];
        var key;
        var args = ("string" === t || "number" === t) ? Array.prototype.slice.call(arguments) : arguments[0];

        for (key in args) {
            str = str.replace(new RegExp("\\{" + key + "\\}", "gi"), args[key]);
        }
    }

    return str;
};

// Replace: ([\w\.]+).format\(
// To:      formatText($1, 
function formatText (template, data) {
    var template = template.toString();
    for (key in data) {
        template = template.replace(new RegExp("\\{" + key + "\\}", "gi"), data[key]);
    }
    return template;
};