the simplest perfomance benchmark (node)

const performance = require('perf_hooks').performance;

function checkout(n){

    var sum = 0;
    for(var i=0;i<n;i++){
        sum+=1;
    }
    return sum;
}

function apply(n){
    var time = performance.now();

    console.log(checkout(n));

    time = performance.now()- time;
    console.log('execution time = ', time);

}

for (let index = 0; index < 5; index++) {
    apply(10**6);
}

// => ~14-1 ms