const TEST_COUNT = Math.pow(10, 2);

const pojo = {
    name: 'n',
    age: 10
}

function Benckmark(desc, func) {
    console.time(desc)
    let sum = 0;
    for (let index = 0; index < TEST_COUNT; index++) {
        func()
    }
    console.timeEnd(desc)
}

const noop = () => {}

function forLoop(o) {
    const keys = Object.keys(o)
    for (let i = 0; i < keys.length; ++i) {	
        const key = keys[i]
        noop(key)
    }
}

function forOf(o) {
    for (const key of Object.keys(o)) {	
        noop(key)
    }
}

Benckmark('forLoop', () => forLoop(pojo))
Benckmark('forOf', () => forOf(pojo))