Run results for: Array deconstruction vs array push

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36

Browser: Chrome 98

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Small test: array deconstruct	3011111.0 Ops/sec
Medium test: array deconstruct	501604.2 Ops/sec
Large test: array deconstruct	49032.8 Ops/sec
Small test: array push	9015043.0 Ops/sec
Medium test: array push	8919232.0 Ops/sec
Large test: array push	6866497.5 Ops/sec

Script Preparation code:

var sTest = Array.apply(null, Array(100)).map(function (x, i) { return i; });
var mTest = Array.apply(null, Array(1000)).map(function (x, i) { return i; });
var lTest = Array.apply(null, Array(10000)).map(function (x, i) { return i; });

Tests:

Small test: array deconstruct
let result = [ ...sTest, 0 ];
Medium test: array deconstruct
let result = [ ...mTest, 0 ];
Large test: array deconstruct
let result = [ ...lTest, 0 ];
Small test: array push
sTest.push(0);
Medium test: array push
mTest.push(0);
Large test: array push
lTest.push(0);

Run results for: Array deconstruction vs array push

Shows the decremental performance when unnecessarily recreating an array when pushing new items to it.

Small test: array deconstruct

Medium test: array deconstruct

Large test: array deconstruct

Small test: array push

Medium test: array push

Large test: array push