Simple FNs & Helpers

function sum(arr) {
    return arr.reduce((a,b) => a + b);
}

function throttle(fn, ms) {
    let pending = false;

    return () => {
        if (!pending) {
            fn();
            pending = true;
            setTimeout(() => {
                pending = false;
            }, ms);
        }
    }
}

const myFunc = () => {
    console.log("Delayedddd", Date.now());
}

let handler = throttle(myFunc, 200);
handler()
setTimeout(() => handler(), 200);