formatString.js

/**
 * Creates a string using indexed format string
 * @param {string} Format of string
 * @param {...string} One or more strings to be using in the format
 */
function formatString(/* ... */) {
	var args = Array.apply(0, arguments);
	return args.shift().replace(/\{(\d+)\}/g, function(match, index) {
		return index < args.length
			? args[index]
			: match;
	});
}