'use strict';
  
  var callable = require('es5-ext/object/valid-callable')
    , forOf    = require('es6-iterator/for-of')
  
    , call = Function.prototype.call;
  
  module.exports = function (cb/*, thisArg*/) {
  	var thisArg = arguments[1], result = false;
  	callable(cb);
  	forOf(this, function (value, doBreak) {
  		if (call.call(cb, thisArg, value)) {
  			result = true;
  			doBreak();
  		}
  	});
  	return result;
  };