Benchmark: For loop i++ vs i += 1

Script Preparation code:

const arr = [];
for (let i = 0; i < 10000; i++) {
  arr.push(parseInt(10*Math.random()))
}

Tests:

i++ no cache
let sum; for (let i = 0; i < arr.length; i++) { sum += arr[i]; }
i += 1 no cahce
let sum; for (let i = 0; i < arr.length; i += 1) { sum += arr[i]; }
i++ cache length
let sum; const length = arr.length; for (let i = 0; i < length; i++) { sum += arr[i]; }
i += 1 cache length
let sum; const length = arr.length; for (let i = 0; i < length; i += 1) { sum += arr[i]; }

Rendered benchmark preparation results:

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For loop i++ vs i += 1 (version: 0)