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Run results for:
Last item in array Slice vs Length - 1 vs at(-1)
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<iframe src="https://measurethat.net/Embed?id=603996" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.0
Browser:
Firefox 137
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Length - 1
1.9M/s
at(-1)
1.3M/s
Slice
46K/s
View exact numbers
Test name
Executions per second
✓
Length - 1
1,936,920 Ops/sec
at(-1)
1,301,088 Ops/sec
Slice
46,134 Ops/sec
Script Preparation code:
var arr = []; for (let i = 0; i < 1000000; i++) { arr.push(i); }
Tests:
Slice
for (let i = 0; i < 1000; i++) { const v = arr.slice(-1)[0]; }
Length - 1
for (let i = 0; i < 1000; i++) { const v = arr[arr.length - 1]; }
at(-1)
for (let i = 0; i < 1000; i++) { const v = arr.at(-1); }