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Run results for: Array constructor vs literal performance - 100000 items

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Run details:
Mozilla/5.0 (iPad; CPU OS 10_0_1 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) Version/10.0 Mobile/14A403 Safari/602.1
Mobile Safari 10
iOS 10.0.1
iPad
8 years ago
Test name Executions per second
Array constructor - 100000 items 354024.6 Ops/sec
Array literal - 100000 items 356914.8 Ops/sec
Array literal (assign by index) - 100000 items 362310.4 Ops/sec
Array literal (explicit length) - 100000 items 350099.7 Ops/sec
Script Preparation code:
​x
 
var n = 10;
​
function Person(name, age) {
  this.name = name;
  this.age = age;
}
Tests:

  • Array constructor - 100000 items

     
    var arr = new Array(n);
    ​
    for (var i = 0; i < n; i++) {
      arr[i] = new Person(i + '', i);
    }

  • Array literal - 100000 items

     
    var arr = [];
    ​
    for (var i = 0; i < n; i++) {
      arr.push(new Person(i + '', i));
    }

  • Array literal (assign by index) - 100000 items

     
    var arr = [];
    ​
    for (var i = 0; i < n; i++) {
      arr[i] = new Person(i + '', i);
    }

  • Array literal (explicit length) - 100000 items

     
    var arr = [];
    arr.length = n;
    ​
    for (var i = 0; i < n; i++) {
      arr[i] = new Person(i + '', i);
    }