Run results for: Array Initialization: Constructor vs Literal

Run details:

User agent: Mozilla/5.0 (Linux; Android 5.0.1; GT-I9505 Build/LRX22C) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.81 Mobile Safari/537.36

Browser: Chrome Mobile 51

Operating system: Android 5.0.1

Device Platform: Samsung GT-I9505

Date tested: 7 years ago

Test name	Executions per second
Literal with push	19430.3 Ops/sec
Constructor() with push	23382.0 Ops/sec
Constructor(times) with push	19202.8 Ops/sec
Literal with index	31628.0 Ops/sec
Constructor() with index	30256.9 Ops/sec
Constructor(times) with index	32682.2 Ops/sec
Literal with push and overflow	24178.0 Ops/sec
Constructor() with push and overflow	18423.7 Ops/sec
Constructor(times) with push and overflow	13744.7 Ops/sec
Literal with index and overflow	33135.3 Ops/sec
Constructor() with index and overflow	26403.2 Ops/sec
Constructor(times) with index and overflow	28992.1 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