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js StringBuilder

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  1. function StringBuilder(){
  2.     // (C) Andrea Giammarchi - Mit Style License
  3.     //	http://webreflection.blogspot.com/2008/06/lazy-developers-stack-concept-and.html
  4.     if(arguments.length)
  5.         this.append.apply(this, arguments);
  6. };
  7. StringBuilder.prototype = function(){
  8.     var join = Array.prototype.join,
  9.         slice = Array.prototype.slice,
  10.         RegExp = /\{(\d+)\}/g,
  11.         toString = function(){return join.call(this, "")};
  12.     return {
  13.         constructor:StringBuilder,
  14.         length:0,
  15.         append:Array.prototype.push,
  16.         appendFormat:function(String){
  17.             var i = 0, args = slice.call(arguments, 1);
  18.             this.append(RegExp.test(String) ?
  19.                 String.replace(RegExp, function(String, i){return args[i]}):
  20.                 String.replace(/\?/g, function(){return args[i++]})
  21.             );
  22.             return  this;
  23.         },
  24.         size:function(){return this.toString().length},
  25.         toString:toString,
  26.         valueOf:toString
  27.     }
  28. }();
  29.  
  30. //usage
  31. /*
  32. var str = new StringBuilder("a", "b", "c");
  33. str.append("de", "f");
  34. alert(str.length); // 5
  35. alert(str.size()); // 6, the length of the string
  36. alert(str); // abcdef
  37.  
  38. alert(
  39.     new StringBuilder("a", "b", "c").
  40.     appendFormat("{0}{1}{0}", 0, 1).
  41.     appendFormat("???", 1, 2, 3)
  42. );
  43. // abc010123
  44.  
  45. */

URL: http://webreflection.blogspot.com/2008/06/lazy-developers-stack-concept-and.html

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