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switch elements index

/ Published in: JavaScript
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  1. Array.prototype.switchus = function(a,b) {
  2.   var x, y;
  3.   for(var i = 0; i < this.length; i++) {
  4.     if(a == this[i]) {
  5.       x = i;
  6.     }
  7.     if(b == this[i]) {
  8.       y = i;
  9.     }
  10.   }
  11.   if(x && y) {
  12.     this[x] = b;
  13.     this[y] = a;
  14.     return true;
  15.   } else {
  16.     return false;
  17.   }
  18. }
  19.  
  20. var a = [2,3,4,5,'ultimo elemento', 'mesmo'];
  21. result = a.switchus(4,'mesmo');

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