Timing functions in node.js

index.js

const NS_PER_SEC = 1e9;

function test(func, ...args) {
    let times = [];

    for (let i = 0; i < 5; i++) {
        const t = process.hrtime();
        func(...args);
        const diff = process.hrtime(t);
        times.push((diff[0] * NS_PER_SEC) + diff[1]);
    }

    return times;
}

function avg(o) {
    return o.reduce((a,b,i) => a+b) / o.length;
}

let a = test(func_a, "args");
let b = test(func_b, "args");
console.log(a > b ? "a won" : "b won");