Use of String.Format in JavaScript?

Question

This is driving me nuts. I believe I asked this exact same question, but I can\'t find it any more (I used Stack Overflow search, Google Search, manually searched my po

Answer 1

String.prototype.format = function () {
    var formatted = this;
    for (var arg in arguments) {
        formatted = formatted.split('{' + arg + '}').join(arguments[arg]);
    }
    return formatted;
};

USAGE:

'Hello {0}!'.format('Word')                 ->     Hello World!

'He{0}{0}o World!'.format('l')            ->     Hello World!

'{0} {1}!'.format('Hello', 'Word')     ->     Hello World!

'{0}!'.format('Hello {1}', 'Word')     ->     Hello World!