Run results for: fill array with value: map(callback) vs fill(value) vs fill(dummy).map(callback)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

.fill(value) - 1 000 elements

862K/s

.map(callback) - 1 000 elements

377K/s

.fill(value) - 10 000 elements

99K/s

.map(callback) - 10 000 elements

42K/s

.fill(value) - 100 000 elements

9K/s

.map(callback) - 100 000 elements

4K/s

.fill(dummy).map(callback) - 100 000 elements

1K/s

View exact numbers

Test name	Executions per second
✓ .fill(value) - 1 000 elements	861,659 Ops/sec
.map(callback) - 1 000 elements	376,575 Ops/sec
.fill(value) - 10 000 elements	99,304 Ops/sec
.map(callback) - 10 000 elements	41,538 Ops/sec
.fill(value) - 100 000 elements	9,120 Ops/sec
.map(callback) - 100 000 elements	3,605 Ops/sec
.fill(dummy).map(callback) - 100 000 elements	1,379 Ops/sec

Script Preparation code:

var array1000 = (new Array(1000)).map((e, i) => ({a: i, b: i, c: i, d: i, e: i, f: i, g: i, test: 'object'+ i}));
var array10000 = (new Array(10000)).map((e, i) => ({a: i, b: i, c: i, d: i, e: i, f: i, g: i, test: 'object'+ i}));
var array100000 = (new Array(100000)).map((e, i) => ({a: i, b: i, c: i, d: i, e: i, f: i, g: i, test: 'object'+ i}));

Tests:

.map(callback) - 1 000 elements
const result = array1000.map(() => true);
.fill(value) - 1 000 elements
const result = new Array(array1000.length).fill(true);
.map(callback) - 10 000 elements
const result = array10000.map(() => true);
.fill(value) - 10 000 elements
const result = new Array(array10000.length).fill(true);
.map(callback) - 100 000 elements
const result = array100000.map(() => true);
.fill(value) - 100 000 elements
const result = new Array(array100000.length).fill(true);
.fill(dummy).map(callback) - 100 000 elements
const result = new Array(array100000.length).fill(0).map(() => true)