Nodejs String Format format(arg)

Method Source Code

String.prototype.format = function(arg) {
  var argLen, args, repFn, str;
  repFn = void 0;//from   w w w.  ja v  a 2 s  .  c  o  m
  str = this;
  if (typeof arg === "object") {
    repFn = function(a, b) {
      if (arg[b]) {
        return arg[b];
      } else {
        return a;
      }
    };
  } else {
    args = arguments;
    argLen = args.length - 1;
    str = str.replace(/(?!\{)*\{\{(\w+)\}\}/g, function(a) {
      var ret;
      args[++argLen] = a.replace("{{", "{").replace("}}", "}");
      ret = "{" + argLen + "}";
      return ret;
    });
    repFn = function(a, b) {
      return args[parseInt(b, 10)];
    };
  }
  return str.replace(/(?!\{)*\{(\w+)\}/g, repFn);
};

Related

1. format()

   String.prototype.format = function () {
       var args = arguments;
       var input = this;        
       var output = "";
       if (input.length > 0) {
           if (args[0] === undefined || args[0] === null) {
               output = "string without any arguments";
           else {
   ...
   

2. format()

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

3. format()

   String.format = function() {
       "use strict"
       var theString = arguments[0];
       for (var i = 1; i < arguments.length; i++) {
           var regEx = new RegExp("\\{" + (i - 1) + "\\}", "gm");
           theString = theString.replace(regEx, arguments[i]);
       return theString;
   };
   ...
   

4. format()

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

5. format(...args)

   String.prototype.format = function (...args) {
     return this.replace(/\{(\d+)\}/g, function (m, i) {
       return args[i]
     })
   

6. format(args)

       var result = this;
       if (arguments.length > 0) {    
           if (arguments.length == 1 && typeof (args) == "object") {
               for (var key in args) {
                   if(args[key]!=undefined){
                       var reg = new RegExp("({" + key + "})", "g");
                       result = result.replace(reg, args[key]);
           else {
               for (var i = 0; i < arguments.length; i++) {
                   if (arguments[i] != undefined) {
                       var reg = new RegExp("({[" + i + "]})", "g");
                       result = result.replace(reg, arguments[i]);
       return result;
   };
   

7. format(args)

   String.prototype.format = function (args) {
       var newStr = this;
       for (var key in args) {
           newStr = newStr.replace('{' + key + '}', args[key]);
       return newStr;
   

8. format(args)

   String.prototype.format = function (args) {
     var newStr = this;
     for (var key in args) {
       newStr = newStr.replace(new RegExp("{" + key + "}","g"), args[key]);
     return newStr;
   };
   

9. format(args)

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