Nodejs String Format format()

Method Source Code

/**//ww  w.  j  a v  a2  s.  co m
 * Convenience method for assembling strings from multiple parts.  You can pass in a set of strings as arguments
 * that will replace tokens in the source strings based on argument index, OR you can pass in an object
 * of name value pairs that will replace tokens in the string based on key values.
 * ex: '{0} {0} {1} {2}'.format(3.14, 'abc', 'foo'); //outputs: 3.14 3.14 abc foo
 * ex: '{key1} {name} {key1}'.format({"key1" : 123, "name" : "Bob"}); //outputs: 123 Bob 123
 */
String.prototype.format = function() {
  var txt = this;
  var i = arguments.length;

  var replaceTokens = function(txt, key, value) {
    return txt.replace(new RegExp('\\{' + key + '\\}', 'gm'), value);
  };

  if(i > 0 && typeof(arguments[0]) == "object") { //process name value pairs
    for(var key in arguments[0]) {
      txt = replaceTokens(txt, key, arguments[0][key]);
    }
  }
  else { //do replacement by argument indexes
    while (i--) {
      txt = replaceTokens(txt, i, arguments[i]);
    }
  }
  return txt;
};

Related

1. format()

   String.prototype.format = function() {
     var formatted = this;
     for (arg in arguments) {
       formatted = formatted.replace('{' + arg + '}', arguments[arg]);
     return formatted;
   };
   

2. format()

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

3. format()

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

4. format()

   String.prototype.format = function () {
       var args = arguments;
       var reg = /\{(\d+)}/g;
       return this.replace(reg, function (g0, g1) {
           return args[+g1];
       });
   };
   var str = "this is :{0} and {1} , and  {0}".format("arg1","arg2")
   var main = "Scripts/main";
   ...
   

5. format()

   String.prototype.format = function(){    
     var re_all = /{(\d+)?(:(\d+)?(.\d+?f))?}/g;
     var re_index = /(\d+):/;
     var re_before = /(\d+)\./;
     var re_after = /\.(\d+)/;
     var cur = this;
     var matches = cur.match(re_all);
     if (arguments.length > matches){
       console.log("Too many arguments!");
   ...
   

6. format()

   String.prototype.format = function() {
       var s = this,
           i = arguments.length;
       while (i--) {
           s = s.replace(new RegExp('\\{' + i + '\\}', 'gm'), arguments[i]);
       return s;
   };
   

7. 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();
   ...
   

8. 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();
   ...
   

9. 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',
   ...