Here you can find the source of format()
String.prototype.format = function(){ var pattern = /\{\d+\}/g; var args = arguments; return this.replace(pattern, function(capture){ return args[capture.match(/\d+/)]; }); }
String.prototype.format = function() { var newStr = this, i = 0; while (/%s/.test(newStr)) newStr = newStr.replace("%s", arguments[i++]) return newStr;
String.prototype.format = function() { var args = arguments; return this.replace(/\{(\d+)\}/g, function() { return args[arguments[1]]; }); };
String.prototype.format = function() var args = arguments; return this.replace(/\{(\d+)\}/g, function(m,i){ return args[i]; });
String.prototype.format = function(){ var args = arguments; return this.replace(/\{(\d)\}/g, function(a,b){ return typeof args[b] != 'undefined' ? args[b] : a; });
var util = require('util'); String.prototype.format = function () { return util.format.apply(null, [ this.toString() ].concat(Array.prototype.slice.call(arguments))); };
String.prototype.format = function() { var formatted = this; _.forEach(arguments, function(arg, i) { formatted = formatted.replace("{" + i + "}", arg); }); return formatted; };
'use strict'; String.prototype.format = function() { var formatted = this; for (var arg in arguments) { formatted = formatted.replace('{' + arg + '}', arguments[arg]); return formatted; };
String.prototype.format = function() { var s = this, i = arguments.length while (i--) { s = s.replace(new RegExp('\\{' + i + '\\}', 'gm'), arguments[i]) return s
String.prototype.format = function() { var formatted = this; for( var arg in arguments ) { formatted = formatted.replace("{" + arg + "}", arguments[arg]); return formatted; };