Run results for: divide by 2 vs multiply by 0.5 - 1

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser: Chrome 108

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
div by 2	131.2 Ops/sec
div by 2.0	133.7 Ops/sec
multiply by 0.5	131.1 Ops/sec
bitwise	67.0 Ops/sec

Script Preparation code:

const length = 100000;
const tmp_nums=[];
for (let i = 0; i < length; i++) {
  tmp_nums.push(Date.now() + Math.random());
}
nums = [...tmp_nums];
nums_len = length;

Tests:

div by 2
const length = nums_len; for (let i = 0; i < length; i++) { nums[i] /= 2; }
div by 2.0
const length = nums_len; for (let i = 0; i < length; i++) { nums[i] /= 2.0; }
multiply by 0.5
const length = nums_len; for (let i = 0; i < length; i++) { nums[i] *= 0.5; }
bitwise
const length = nums_len; for (let i = 0; i < length; i++) { nums[i] = nums[i] >> 1; }

Run results for: divide by 2 vs multiply by 0.5 - 1

div by 2

div by 2.0

multiply by 0.5

bitwise