printf analog in JavaScript From http://habrahabr.ru/post/192124/

printf.js

String.prototype.format = function() {
    var i = -1, args = arguments;
    
    return this.replace(/#\{(.*?)\}/g, function(one, two) {
        return (typeof args[0] == 'object')?args[0][two]:args[++i];
    });
}

var thing = 'world!';

console.log(
    'hello #{1} - #{2}'.format(thing, 'two!'),
    'hello #{wrd} - #{2}'.format({'wrd': thing, '2': 'two!'})
);