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Find type of variable

/ Published in: JavaScript
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  1. function type(o){
  2.     return !!o && Object.prototype.toString.call(o).match(/(\w+)\]/)[1];
  3. }
  4.  
  5. // or this way too
  6.  
  7. (function(){
  8.     var types = ['Array','Function','Object','String','Number'],
  9.         typesLength = types.length;
  10.     while (typesLength--) {
  11.         window['is' + types[typesLength]] = (function(type){
  12.             return function(o) {
  13.                 return !!o && ( Object.prototype.toString.call(o) === '[object ' + type + ']' );
  14.             }
  15.         })(types[typesLength]);
  16.     }
  17. })();

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