Nodejs String Format format()

Method Source Code

String.prototype.format = function () {
   var str = this,
      args = arguments;//w  w  w. j av  a  2  s . c om
   return str.replace(String.prototype.format.regex, function(item) {
      var intVal = parseInt(item.substring(1, item.length - 1)),
         replace;
      if (intVal >= 0) {
         replace = args[intVal];
      } else if (intVal === -1) {
         replace = "{";
      } else if (intVal === -2) {
         replace = "}";
      } else {
         replace = "";
      }
      return replace;
   });
};
String.prototype.format.regex = new RegExp("{-?[0-9]+}", "g");

Related

1. format()

   String.prototype.format = function () {
       var formatted = this;
       if (arguments != null) {
           for (var i = 0; i < arguments.length; i++) {
               while (formatted.indexOf("{" + i + "}") > -1) {
                   formatted = formatted.replace("{" + i + "}", arguments[i]);
       return formatted;
   };
   

2. format()

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

3. format()

   String.prototype.format = function() {
       var res = this;
       for (var i = 0; i < arguments.length; i++) {
           res = res.replace(new RegExp("\\{" + (i) + "\\}", "g"), arguments[i]);
       return res;
   };
   

4. format()

   String.prototype.format = function() {
     var args = arguments;
     return this.replace(/\$\{([A-Za-z0-9_]+)\}/g, function(base, element, position) {
       for (var i = 0; i < args.length; i++) {
         if (args[i] != null && typeof(args[i][element]) != "undefined")
           return args[i][element];
       if (typeof(args[element - 1]) == "undefined")
         return base;
   ...
   

5. format()

   String.prototype.format = function(){
     var fn = String.format;
     switch (arguments.length) {
       case 1:
         return fn(this, arguments[0]);
       case 2:
         return fn(this, arguments[0], arguments[1]);
       case 3:
         return fn(this, arguments[0], arguments[1], arguments[2]);
   ...
   

6. format()

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

7. format()

   'use strict';
   String.prototype.format = function() {
     var self = this;
     for(var i = 0; i < arguments.length; i += 1) {
       var reg = new RegExp("\\{" + i + "\\}", "gm");
       self = self.replace(reg, arguments[i]);
     return self;
   };
   ...
   

8. format()

   String.prototype.format = function() {
       var args = arguments;
       return this.replace(/\$\{p(\d)\}/g, (match, id) => {
           return args[id]
       })
   String.prototype.sid = function() {
       return `${this.substring(0, 7)}...`
   

9. format()

   String.prototype.format = function(){
     return this.replace(/(\d)(?=(\d{3})+(?!\d))/g, "$1,");
   };