Check the speed the rounding inside loop and in loop's condition

rouding-loop.js

const Benchmark = require('benchmark')
const suite = new Benchmark.Suite()

suite
    .add('With rounding inside loop', () => {
        let i = 0
        let step = 0.5
        while(i < 1000) {
            i += Math.round(step)
        }
    })
    .add('With rounding in condition', () => {
        let i = 0
        let step = 0.5
        while(Math.round(i) < 1000) {
            i += step
        }
    })
    .on('cycle', event => console.log(String(event.target)) )
    .on('complete', function() {
        console.log('Fastest is ' + this.filter('fastest').map('name'))
    })
    .run({ 'async': true })

Results:

With rounding inside loop x 1,352,140 ops/sec ±0.80% (89 runs sampled)
With rounding in condition x 144,753 ops/sec ±0.78% (89 runs sampled)
Fastest is With rounding inside loop