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Run results for:
for loop vs array map
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<iframe src="https://measurethat.net/Embed?id=623990" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:146.0) Gecko/20100101 Firefox/146.0
Browser:
Firefox 146
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
6 months ago
for loop using a sparse array
3K/s
for loop
2K/s
Array.prototype.map
2K/s
View exact numbers
Test name
Executions per second
✓
for loop using a sparse array
2,537 Ops/sec
for loop
2,180 Ops/sec
Array.prototype.map
1,829 Ops/sec
Tests:
for loop
const numbers = Array(100000).fill(0); for (let i = 0; i < numbers.length; i++) { numbers[i] = i; } const doubled = Array(numbers.length).fill(null); for (let i = 0; i < numbers.length; i++) { doubled[i] = numbers[i] * 2; }
Array.prototype.map
const numbers = Array(100000).fill(0); for (let i = 0; i < numbers.length; i++) { numbers[i] = i; } const doubled = numbers.map((x) => x * 2);
for loop using a sparse array
const numbers = Array(100000).fill(0); for (let i = 0; i < numbers.length; i++) { numbers[i] = i; } const doubled = Array(numbers.length); for (let i = 0; i < numbers.length; i++) { doubled[i] = numbers[i] * 2; }