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Run results for: Array constructor vs literal performance (10 items)

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36
Chrome 53
Mac OS X 10.12.0
Other
8 years ago
Test name Executions per second
Array constructor - 10 items 3978483.8 Ops/sec
Array literal - 10 items 15569086.0 Ops/sec
Array literal (assign by index) - 10 items 15560815.0 Ops/sec
Array literal (explicit length) - 10 items 6811425.0 Ops/sec
Tests:

  • Array constructor - 10 items

    ​x
     
    var n = 10;
    var arr = new Array(n);
    ​
    for (var i = 0; i < n; i++) {
      arr[i] = i;
    }

  • Array literal - 10 items

     
    var n = 10;
    var arr = [];
    ​
    for (var i = 0; i < n; i++) {
      arr.push(i);
    }

  • Array literal (assign by index) - 10 items

     
    var n = 10;
    var arr = [];
    ​
    for (var i = 0; i < n; i++) {
      arr[i] = i;
    }

  • Array literal (explicit length) - 10 items

     
    var n = 10;
    var arr = [];
    arr.length = n;
    ​
    for (var i = 0; i < n; i++) {
      arr[i] = i;
    }