Run results for: Array_Filter_VS_loop

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36

Browser: Chrome 60

Operating system: Windows

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
test_filter	20643.5 Ops/sec
test_loop	0.0 Ops/sec
test_loop_optimized	3288.8 Ops/sec

Script Preparation code:

  var items = [];
  var names = ['george', 'nick', 'jack', 'herodotus', 'joanne'];
  for (var i = 0; i < 2000; i++) {
   var obj = {
    name: names[i % 5] + '-' + i,
    age: i % 10 + 15
   };
   items.push(obj);
  }
  
  function filter_callback(item) {
   return (item.age == '18');
  }
  
  function test_filter() {
   var aged_18_filter = items.filter(filter_callback);
  }
  
  function test_looptest_looptest_looptest_loop() {
   var aged_18_loop = [];
   for (var i = 0; i < items.length; i++) {
    if (items[i].age == '18') aged_18_loop.push(items[i]);
   }
  }

 function test_loop_optimized() {
 var length=items.length
   var aged_18_loop = new Array(length);
   for (var i = 0; i < length; i++) {
    if (items[i].age == '18') aged_18_loop=items[i];
   }
  }

Tests:

test_filter
test_filter()
test_loop
test_loop()
test_loop_optimized
test_loop_optimized()