Nodejs String Format format()

Method Source Code

/*//from  w  w w.  j  a  v a2  s .  co  m
if (!String.prototype.format) {
  String.prototype.format = function() {
    var args = arguments;
    return this.replace(/{(\d+)}/g, function(match, number) { 
      return typeof args[number] != 'undefined'
        ? args[number]
        : match
      ;
    });
  };
} else {
  console.log(String.prototype.format);
}
*/
String.prototype.printf = function (obj) {
  var useArguments = false;
  var _arguments = arguments;
  var i = -1;
  if (typeof _arguments[0] == "string") {
    useArguments = true;
  }
  if (obj instanceof Array || useArguments) {
    return this.replace(/\%s/g,
    function (a, b) {
      i++;
      if (useArguments) {
        if (typeof _arguments[i] == 'string') {
          return _arguments[i];
        }
        else {
          throw new Error("Arguments element is an invalid type. "+typeof _arguments[i]);
        }
      }
      return obj[i];
    });
  }
  else {
    return this.replace(/{([^{}]*)}/g,
    function (a, b) {
      var r = obj[b];
      return typeof r === 'string' || typeof r === 'number' ? r : a;
    });
  }
};

Related

1. format()

   String.prototype.format=function(){
     if(arguments.length==0) return this;
     var args=[], i=0;
     for(;i<arguments.length;i++) args[i]=arguments[i];
     return this.replace(/\%[sSfdDTt\%]/g, function(m){
       if(m=='%%') return '%';
       var v=args.shift();
       switch(m.substr(1,1)){
         case 's': return v.toString();
   ...
   

2. format()

   String.prototype.format=function(){
     if(arguments.length==0) return this;
     var args=[], i=0;
     for(;i<arguments.length;i++) args[i]=arguments[i];
     return this.replace(/\%[sSfdDTt\%]/g, function(m){
       if(m=='%%') return '%';
       var v=args.shift();
       switch(m.substr(1,1)){
         case 's': return v.toString();
   ...
   

3. format()

   String.prototype.format = function (){
     var values = [].slice.call(arguments, 0, arguments.length),
         idx, 
         length = values.length,
         regex, 
         str = this;
     if(str.match(/\{\d+\}/g).length !== length){
       throw{
         name: 'ArgumentMissMatch',
   ...
   

4. format()

   'use strict';
   String.prototype.format = function () {
       var args = arguments;
       var unkeyed_index = 0;
       return this.replace(/\{{1,2}(\w*)\}{1,2}/g, function (match, key) {
           if (match.indexOf('{{') !== -1) { 
               return match.replace('{{', '{').replace('}}', '}');
           if (key === '') { 
   ...
   

5. format()

   String.prototype.format = function() {
       var newStr = this, i = 0;
       while (/%s/.test(newStr)) {
           newStr = newStr.replace("%s", arguments[i++])
       return newStr;
   

6. format()

   String.prototype.format = function () {
       'use strict';
       var newString = this;
       function replace(string, search, replacement) {
           return string.replace(new RegExp(search.replace('{', '\\{').replace('}', '\\}'), 'g'), replacement.toString());
       if (arguments[0] !== 'undefined') {
           switch (typeof arguments[0]) {
               case 'object':
   ...
   

7. format()

   String.prototype.format = function() {
     var args = Array.prototype.slice.call(arguments);
     var str = this;
     return str.replace(/%s/g, function(match, index) {
       if (str.charAt(index-1) == "%") {
         return match;
       } else {
         return args.shift();
     });
   

8. format()

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

9. format()

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