Loop vs map vs forEach

JavaScript performance comparison

Revision 17 of this test case created by Fredrik Borgström

Preparation code 


      
      <script>

        Benchmark.prototype.setup = function() {

          
  var range = [];
  
  for (var i = 0; i < 10000; i++) {
    range.push({
      name: "Hello",
      value: 5
    });
  }

        
  };


      
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
forEach 
var result = new Array(range.length);

range.forEach(function(item, idx) {
  item.name = 'hi';
  item.value = 6;
  result[idx] = item;
});
 pending…
map 
var result = range.map(function(item) {
  item.name = 'hi';
  item.value = 6;
  return item;
});
 pending…
while 
var item,
  ln = range.length,
  result = new Array(ln);

while (--ln > -1) {
  item = range[ln];
   item.name = 'hi';
  item.value = 6;
  result[ln] = item;
}
 pending…
forEach es6 
const res = new Array(range.length);

range.forEach((item, idx) => {
  item.name = 'hi';
  item.value = 6;
  result[idx] = item;
});
 pending…
Loop 
var i,
  item,
  ln = range.length,
  result = new Array(ln);

for (i = 0; i < ln; i++) {
  item = range[i];
  item.name = 'hi';
  item.value = 6;
}
 pending…
forEach using push 
var result = [];

range.forEach(function(item) {
  item.name = 'hi';
  item.value = 6;
  result.push(item);
});
 pending…

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Revisions

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