native vs implmented - 0

JavaScript performance comparison

Revision 5 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  function each (obj, func, context) {
      var kindex,
          length;
      for (kindex = 0, length = obj.length; kindex < length; kindex++) {
          func.call(context, obj[kindex], kindex, obj);
      }
  }
  
  function forEach( callback, thisArg ) {
  
      var T, k;
  
      if ( this == null ) {
        throw new TypeError( "this is null or not defined" );
      }
  
      // 1. Let O be the result of calling ToObject passing the |this| value as the argument.
      var O = Object(this);
  
      // 2. Let lenValue be the result of calling the Get internal method of O with the argument "length".
      // 3. Let len be ToUint32(lenValue).
      var len = O.length >>> 0; // Hack to convert O.length to a UInt32
  
      // 4. If IsCallable(callback) is false, throw a TypeError exception.
      // See: http://es5.github.com/#x9.11
      if ( {}.toString.call(callback) !== "[object Function]" ) {
        throw new TypeError( callback + " is not a function" );
      }
  
      // 5. If thisArg was supplied, let T be thisArg; else let T be undefined.
      if ( thisArg ) {
        T = thisArg;
      }
  
      // 6. Let k be 0
      k = 0;
  
      // 7. Repeat, while k < len
      while( k < len ) {
  
        var kValue;
  
        // a. Let Pk be ToString(k).
        //   This is implicit for LHS operands of the in operator
        // b. Let kPresent be the result of calling the HasProperty internal method of O with argument Pk.
        //   This step can be combined with c
        // c. If kPresent is true, then
        if ( Object.prototype.hasOwnProperty.call(O, k) ) {
  
          // i. Let kValue be the result of calling the Get internal method of O with argument Pk.
          kValue = O[ k ];
  
          // ii. Call the Call internal method of callback with T as the this value and
          // argument list containing kValue, k, and O.
          callback.call( T, kValue, k, O );
        }
        // d. Increase k by 1.
        k++;
      }
      // 8. return undefined
    };
  
  
  function forEachSimple( callback, thisArg ) {
  
      var T, k;
  
      if ( this == null ) {
        throw new TypeError( "this is null or not defined" );
      }
  
      // 1. Let O be the result of calling ToObject passing the |this| value as the argument.
      var O = Object(this);
  
      // 2. Let lenValue be the result of calling the Get internal method of O with the argument "length".
      // 3. Let len be ToUint32(lenValue).
      var len = O.length >>> 0; // Hack to convert O.length to a UInt32
  
      // 4. If IsCallable(callback) is false, throw a TypeError exception.
      // See: http://es5.github.com/#x9.11
      if ( {}.toString.call(callback) !== "[object Function]" ) {
        throw new TypeError( callback + " is not a function" );
      }
  
      // 5. If thisArg was supplied, let T be thisArg; else let T be undefined.
      if ( thisArg ) {
        T = thisArg;
      }
  
      // 6. Let k be 0
      k = 0;
  
      // 7. Repeat, while k < len
      while( k < len ) {
  
        var kValue;
  
        // a. Let Pk be ToString(k).
        //   This is implicit for LHS operands of the in operator
        // b. Let kPresent be the result of calling the HasProperty internal method of O with argument Pk.
        //   This step can be combined with c
        // c. If kPresent is true, then
        //if ( Object.prototype.hasOwnProperty.call(O, k) ) {
  
          // i. Let kValue be the result of calling the Get internal method of O with argument Pk.
          kValue = O[ k ];
  
          // ii. Call the Call internal method of callback with T as the this value and
          // argument list containing kValue, k, and O.
          callback.call( T, kValue, k, O );
        //}
        // d. Increase k by 1.
        k++;
      }
      // 8. return undefined
    };

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
implemented
each([0,1,2,3], function(val){
    val++;
});
pending…
native
[0,1,2,3].forEach(function(val){
    val++
});
pending…
forEach from MDN
forEach.call([0,1,2,3], function(val){
    val++
});
pending…
forEach without hasOwnProperty
forEachSimple.call([0,1,2,3], function(val){
    val++
});
pending…

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