Javascript string.format <3

strfmt.js

// from http://stackoverflow.com/a/4256130/841339
String.prototype.format = function() {
    var formatted = this;
    for (var i = 0; i < arguments.length; i++) {
        var regexp = new RegExp('\\{'+i+'\\}', 'gi');
        formatted = formatted.replace(regexp, arguments[i]);
    }
    return formatted;
};

Usage

var myVar = "Hello {0}! Let's talk about {1}."
console.log(myVar.format("World", "Javascript"))