Nodejs String Format format()

Method Source Code

String.prototype.format = function() {
   var args = arguments;
   //from   ww w .  j a v a 2s. co  m
   return this.replace(/\$\{([A-Za-z0-9_]+)\}/g, function(base, element, position) {
      for (var i = 0; i < args.length; i++) {
         var arg = args[i];

         if (arg && typeof(arg) == "object") {
            try {
               if (arg[element] !== undefined)
                  return arg[element];
            }
            catch (e) {
            }
         }
      }

      if (typeof(args[element - 1]) == "undefined")
         return base;
      else {
         var elem = args[element - 1];
         
         if (elem === null)
            return "null";
         else
            return elem;
      }
   })
}

String.prototype.beginsWith = function(str) {
   return (this.substr(0, str.length) == str);
}

String.prototype.endsWith = function(str) {
   return (this.substr(-str.length) == str);
}

Related

1. format()

   String.prototype.format = function() {
     var args = arguments;
     return this.replace(/\{\{|\}\}|\{(\d+)\}/g, function(m, n) {
       if (m == "{{") {
         return "{";
       if (m == "}}") {
         return "}";
       return args[n];
     });
   };
   String.prototype.html = function() {
     return $('<i></i>').text(this).html();
   };
   String.prototype.htmlWithLines = function() {
     var text = this.html();
     return text.replace(/\n/g, '<br/>');
   function loc () {
     var code = arguments[0];
     var text = l[code];
     if (text != null) {
       var params = []  ;
       for (var i = 1 ; i < arguments.length ; i++) {
         params.push(arguments[i]);
       return text.format (params);
     } else {
       return "##" + code + "##";
   

2. format()

   function generateUUID(){
       var d = new Date().getTime();
       if(window.performance && typeof window.performance.now === "function"){
           d += performance.now(); 
       var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
           var r = (d + Math.random()*16)%16 | 0;
           d = Math.floor(d/16);
           return (c=='x' ? r : (r&0x3|0x8)).toString(16);
   ...
   

3. format()

   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;
   };
   function lz(n){
   ...
   

4. format()

   'use strict';
   String.prototype.format = function () {
       var args = arguments;
       return this.replace(/{(\d+)}/g, function(match, number) {
           return typeof args[number] != 'undefined' ? args[number] : match;
       });
   };
   

5. format()

   String.prototype.format = function () {
       var args = [].slice.call(arguments);
       return this.replace(/(\{\d+\})/g, function (a) {
           return args[+(a.substr(1, a.length - 2)) || 0];
       });
   };
   var self = {
       clone: function clone(a) {
           return JSON.parse(JSON.stringify(a));
   ...
   

6. format()

   String.prototype.format = function () {
       var args = arguments;
       this.unkeyed_index = 0;
       return this.replace(/\{(\w*)\}/g, function (match, key) {
           if (key === '') {
               key = this.unkeyed_index;
               this.unkeyed_index++
           if (key == +key) {
   ...
   

7. format()

   'use strict';
   String.prototype.format = function () {
       var str = this;
       for (var i = 0; i < arguments.length; i++) {
           var regEx = new RegExp("\\{" + (i) + "\\}", "gm");
           str = str.replace(regEx, arguments[i]);
       return str;
   

8. format()

   String.prototype.format = function () {
       var args = arguments;
       return this.replace(/{(\d+)}/g, function (match, number) {
           if (typeof args[number] != 'undefined') {
               return args[number];
           return "";
       });
   };
   ...
   

9. format()

   String.prototype.format = function () {
     var str = this;
     for ( var i = 0; i < arguments.length; i ++ ) {
       str = str.replace( '{' + i + '}', arguments[ i ] );
     return str;