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Split with a sane second argument behaviour

/ Published in: JavaScript
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  1. String.prototype.split2 = function( delimiter, max )
  2. {
  3.     max = max || Number.Infinity;
  4.     var arr = [];
  5.  
  6.     if( delimiter.constructor != RegExp )
  7.     {
  8.         arr = this.split(delimiter);
  9.         if( arr.length > max )
  10.         {
  11.             arr.push( arr.splice(max-1, arr.length-max+1).join(delimiter) );
  12.         }
  13.     }
  14.     else
  15.     {
  16.         var old_ix = 0;
  17.         var match;
  18.  
  19.         delimiter.lastIndex = 0; // reset the regexp
  20.         while( match = delimiter.exec(this) )
  21.         {
  22.             arr.push( this.slice(old_ix, delimiter.lastIndex-match[0].length) );
  23.             old_ix = delimiter.lastIndex;            
  24.             if( arr.length+1 == max ) { break; }
  25.         }
  26.  
  27.         arr.push(this.slice(old_ix));
  28.     }
  29.  
  30.     return arr;
  31. }

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