Run results for: Slice + reverse vs manual picking array indexes

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Manual pick

50.0M/s

slice + reverse

13.4M/s

View exact numbers

Test name	Executions per second
✓ Manual pick	49,984,224 Ops/sec
slice + reverse	13,356,074 Ops/sec

Script Preparation code:

var input = [1,2,3,4,5,6,7,8,9,10,11,12,13];
var inputLength = input.length;

Tests:

Manual pick
const result = [ input[inputLength - 1], input[inputLength - 2], input[inputLength - 3], input[inputLength - 4], input[inputLength - 5], input[inputLength - 6], input[inputLength - 7]]
slice + reverse
input.slice(inputLength-7, inputLength).reverse()