higher-order-snippets.js

/* Snippets: Higher-order Functions and Functional Programming Patterns */

/* Execute function at N interval */

const setNIntervals = (fn, delay, rounds) => {
    if (!rounds) {
        return;
    }
    setTimeout(() => {
        fn();
        setNIntervals(fn, delay, rounds - 1);
    }, delay);
};

// will fire 3 times, once every second
const mockHandler = (...args) => setNIntervals(() => console.log(...args), 1000, 3);


/* Call variable num of functions, else log all args */

const logOrFire = (...args) => {
    for (let i = 0; i <= args.length - 1; i++) {
        if (typeof args[i] === "function") {
            args[i]();
        }
        else {
            return console.log(...args);
        }
    } 
};

logOrFire("[-]", "[=]");
// [-] [=]

const x = () => console.log("[*]");
const y = () => console.log("[+]");

logOrFire(x, y);
// [*]
// [+]