Run results for: explicit int32 types vs regular js 2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.5 Safari/605.1.15

Browser: Safari 26

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 months ago

regular js

21K/s

explicit int32 types 2

15K/s

explicit int32 types

15K/s

explicit int32 types modern

15K/s

modern js

14K/s

View exact numbers

Test name	Executions per second
✓ regular js	20,545 Ops/sec
explicit int32 types 2	14,894 Ops/sec
explicit int32 types	14,663 Ops/sec
explicit int32 types modern	14,660 Ops/sec
modern js	14,330 Ops/sec

Script Preparation code:

"use strict";
const arr = [];
for (let i=0; i<1000; i++) {
  arr[i] = Array.from({length: Math.floor(Math.random() * 101)}, (function(){return 97 | 0}));
  arr[i].push(0);
}

function strlen(str) {
  let current = 0;
  while (str[current] != 0) {
    current = current + 1;
  }
  return current;
}

function strlen_modern(str) {
  let current = 0;
  while (str[current] !== 0) {
    current += 1;
  }
  return current;
}

function strlen_explicit(str) {
  let current = 0;
  while ((str[current >> 0] | 0) != 0) {
    current = (current + 1) | 0;
  }
  return current | 0;
}

function strlen_explicit_modern(str) {
  let current = 0;
  while ((str[current >> 0] | 0) !== 0) {
    current = (current + 1) | 0;
  }
  return current | 0;
}

Tests:

regular js
"use strict"; let x = 0; for (let i=0; i<1000; i++) { x = strlen(arr[i]); }
modern js
"use strict"; let x = 0; for (let i=0; i<1000; i++) { x = strlen_modern(arr[i]); }
explicit int32 types
"use strict"; let x = 0; for (let i=0; i<1000; i++) { x = strlen_explicit(arr[i]) | 0; }
explicit int32 types 2
"use strict"; let x = 0; for (let i=0; i<1000; i = (i+1) | 0) { x = strlen_explicit(arr[i >> 0]) | 0; }
explicit int32 types modern
"use strict"; let x = 0; for (let i=0; i<1000; i = (i+1) | 0) { x = strlen_explicit_modern(arr[i >> 0]) | 0; }