even-iteration-abstraction.js

even-iteration-abstraction.js

class EvensIterator {
    constructor(realArray) {
        this.realArray = realArray;
    }

    * [Symbol.iterator]() {
        for (const n of this.realArray) {
            if (n % 2 === 0) yield n;
        }
    }
}

const input = [1, 2, 3, 4, 5, 6, 78, 456, 5687, 345, 1423];

// abstraction thing

const evens = new EvensIterator(input);
for (const n of evens) {
    console.log(n);
}

// VS actually doing it

for (const n of input) {
    if (n % 2 === 0) {
        console.log(n);
    }
}