Run results for: Array Initialization: Constructor vs Literal

Run details:

User agent: Mozilla/5.0 (Linux; Android 5.0.1; SAMSUNG GT-I9505 Build/LRX22C) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/4.0 Chrome/44.0.2403.133 Mobile Safari/537.36

Browser: Chrome Mobile 44

Operating system: Android 5.0.1

Device Platform: Samsung GT-I9505

Date tested: 8 years ago

Test name	Executions per second
Literal with push	6879.6 Ops/sec
Constructor() with push	6867.5 Ops/sec
Constructor(times) with push	6550.3 Ops/sec
Literal with index	36078.9 Ops/sec
Constructor() with index	33063.1 Ops/sec
Constructor(times) with index	39390.7 Ops/sec
Literal with push and overflow	7061.6 Ops/sec
Constructor() with push and overflow	6860.5 Ops/sec
Constructor(times) with push and overflow	7053.5 Ops/sec
Literal with index and overflow	36949.9 Ops/sec
Constructor() with index and overflow	33780.5 Ops/sec
Constructor(times) with index and overflow	39960.9 Ops/sec

Script Preparation code:

var times = 500;

var noOverflow = 0,
    overflow = 1;

Tests:

Literal with push
var arr = [], arrSize = times + noOverflow; for (var i = 0; i <= arrSize; i++) { arr.push(1337); }
Constructor() with push
var arr = new Array(), arrSize = times + noOverflow; for (var i = 0; i <= arrSize; i++) { arr.push(1337); }
Constructor(times) with push
var arr = new Array(times), arrSize = times + noOverflow; for (var i = 0; i <= arrSize; i++) { arr.push(1337); }
Literal with index
var arr = [], arrSize = times + noOverflow; for (var i = 0; i <= arrSize; i++) { arr[i] = 1337; }
Constructor() with index
var arr = new Array(), arrSize = times + noOverflow; for (var i = 0; i <= arrSize; i++) { arr[i] = 1337; }
Constructor(times) with index
var arr = new Array(times), arrSize = times + noOverflow; for (var i = 0; i <= arrSize; i++) { arr[i] = 1337; }
Literal with push and overflow
var arr = [], arrSize = times + overflow; for (var i = 0; i <= arrSize; i++) { arr.push(1337); }
Constructor() with push and overflow
var arr = new Array(), arrSize = times + overflow; for (var i = 0; i <= arrSize; i++) { arr.push(1337); }
Constructor(times) with push and overflow
var arr = new Array(times), arrSize = times + overflow; for (var i = 0; i <= arrSize; i++) { arr.push(1337); }
Literal with index and overflow
var arr = [], arrSize = times + overflow; for (var i = 0; i <= arrSize; i++) { arr[i] = 1337; }
Constructor() with index and overflow
var arr = new Array(), arrSize = times + overflow; for (var i = 0; i <= arrSize; i++) { arr[i] = 1337; }
Constructor(times) with index and overflow
var arr = new Array(times), arrSize = times + overflow; for (var i = 0; i <= arrSize; i++) { arr[i] = 1337; }

Run results for: Array Initialization: Constructor vs Literal

This test should measure performance of different array initialization types

Literal with push

Constructor() with push

Constructor(times) with push

Literal with index

Constructor() with index

Constructor(times) with index

Literal with push and overflow

Constructor() with push and overflow

Constructor(times) with push and overflow

Literal with index and overflow

Constructor() with index and overflow

Constructor(times) with index and overflow