object-pool-1.js

function buildArray(n) {
    const arr = [];
    for (let i = 0; i < n; i++) {
        arr.push(i);
    }
}
function buildArray2(n) {
    const arr = new Array(n).fill(0);
    for (let i = 0; i < n; i++) {
        arr[i] = (i);
    }
}

function measureTime(callback, ...a) {
    const start = new Date().getTime();
    buildArray(...a)
    const end = new Date().getTime(),
        time = end - start,
        execs = 1000 / time;

    console.log(`\nFUNCTION: ${callback.name}`)
    console.log(`time in ms: ${time}`);
    console.log(`operations per second: ${execs}`);
}


measureTime(buildArray, 20000000)
measureTime(buildArray2, 20000000)


// FUNCTION: buildArray
// time in ms: 318
// operations per second: 3.1446540880503147
//
// FUNCTION: buildArray2
// time in ms: 262
// operations per second: 3.816793893129771