Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36
Chrome 53
Mac OS X 10.12.0
Other
8 years ago
Test name Executions per second
Array constructor - 10 items 4245485.0 Ops/sec
Array literal - 10 items 17309080.0 Ops/sec
Array literal (assign by index) - 10 items 18234638.0 Ops/sec
Array literal (explicit length) - 10 items 7530503.5 Ops/sec
Array constructor - 1000 items 197481.6 Ops/sec
Array literal - 1000 items 198472.6 Ops/sec
Array literal (assign by index) - 1000 items 210236.6 Ops/sec
Array literal (explicit length) - 1000 items 437439.2 Ops/sec
Array constructor - 100000 items 1015.6 Ops/sec
Array literal - 100000 items 915.9 Ops/sec
Array literal (assign by index) - 100000 items 947.2 Ops/sec
Array literal (explicit length) - 100000 items 1474.1 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;
    } 
  • Array constructor - 1000 items

     
    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;
    } 
  • Array constructor - 100000 items

     
    var n = 100000;
    var arr = new Array(n);
    for (var i = 0; i < n; i++) {
      arr[i] = i;
    }
  • Array literal - 100000 items

     
    var n = 100000;
    var arr = [];
    for (var i = 0; i < n; i++) {
      arr.push(i);
    } 
  • Array literal (assign by index) - 100000 items

     
    var n = 100000;
    var arr = [];
    for (var i = 0; i < n; i++) {
      arr[i] = i;
    } 
  • Array literal (explicit length) - 100000 items

     
    var n = 100000;
    var arr = [];
    arr.length = n;
    for (var i = 0; i < n; i++) {
      arr[i] = i;
    }