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Run results for:
Array for vs fill vs map
People tend to use array fil and then foreach, we know foreach is faster than a for loop, but is it also faster if you use array fill first?
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<iframe src="https://measurethat.net/Embed?id=622141" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Browser:
Chrome 143
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
8 months ago
fill then edit with for
203K/s
for loop
90K/s
map
21K/s
View exact numbers
Test name
Executions per second
✓
fill then edit with for
202,787 Ops/sec
for loop
90,321 Ops/sec
map
21,246 Ops/sec
Script Preparation code:
var iterations = 10000;
Tests:
fill then edit with for
const array = new Uint8Array(iterations).fill(0); for(let i=0;i<iterations;i+=2) array[i]=1;
map
new Uint8Array(iterations).map((_, i) => i%2?0:1);
for loop
const array = new Uint8Array(iterations); for(let i=0;i<iterations;i++) array[i]=i%2?0:1;