Run results for: Array Initialization: Constructor vs Literal

Run details:

User agent: 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

Browser: Chrome 53

Operating system: Mac OS X 10.11.6

Device Platform: Other

Date tested: 8 years ago

Test name	Executions per second
Literal with push	3826.0 Ops/sec
Constructor() with push	2924.2 Ops/sec
Constructor(times) with push	6450.4 Ops/sec
Literal with index	9386.4 Ops/sec
Constructor() with index	9353.4 Ops/sec
Constructor(times) with index	12325.8 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