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Javascript array member tests

/ Published in: JavaScript
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Given:
`a=['1',2,6];`

Allows things like:
`
a.contains(2); //true
'1'.in(a);
(1).in(a,true); //type not identical, so false
(1).in(a); //no type check, so true
`

I never actually used this, it was more of an exercise in playing with JS.

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  1. function in_test(ary,stricttype) {
  2.   for (var i=0; i<ary.length; i++) {
  3.     if (ary[i]==this) 
  4.       if (stricttype) return typeof(ary[i])==typeof(this)
  5.       else return true;
  6.   }
  7.   return false;
  8. }
  9. String.prototype.in = in_test;
  10. Number.prototype.in = in_test;
  11. //you could add it on Boolean, Date, but would you use it?
  12.  
  13. Array.prototype.contains = function(o,stricttype) {
  14.   for (var i=0; i<this.length; i++) {
  15.       if (this[i]==o)
  16.         if (stricttype) return typeof(this[i])==typeof(o)
  17.         else return true;
  18.     if (this[i]==o) return true;
  19.   }
  20.   return false;
  21. }

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