MeasureThat.net

Run results for: Array constructor vs literal performance - 1000 items

Go to the benchmark
Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36
Chrome 53
Mac OS X 10.11.6
Other
8 years ago
Test name Executions per second
Array constructor - 1000 items 227036.1 Ops/sec
Array literal - 1000 items 150661.5 Ops/sec
Array literal (assign by index) - 1000 items 158591.0 Ops/sec
Array literal (explicit length) - 1000 items 564172.2 Ops/sec
Tests:

  • Array constructor - 1000 items

    ​x
     
    var n = 1000;
    var arr = new Array(n);
    ​
    for (var i = 0; i < n; i++) {
      arr[i] = i;
    }

  • Array literal - 1000 items

     
    var n = 1000;
    var arr = [];
    ​
    for (var i = 0; i < n; i++) {
      arr.push(i);
    }

  • Array literal (assign by index) - 1000 items

     
    var n = 1000;
    var arr = [];
    ​
    for (var i = 0; i < n; i++) {
      arr[i] = i;
    }

  • Array literal (explicit length) - 1000 items

     
    var n = 1000;
    var arr = [];
    arr.length = n;
    ​
    for (var i = 0; i < n; i++) {
      arr[i] = i;
    }