_JavaScript_zip_iterable

zip.js

function *zip(iter1, iter2) {
    const a = iter1[Symbol.iterator]();
    const b = iter2[Symbol.iterator]();
    
    let va = null;
    let vb = null;
    while (!((va = a.next()).done) && !((vb = b.next()).done)) {
        yield [va.value, vb.value];
    }
}

for(const a of zip([1,2,3], [10, 20, 30])) console.log(a);
/*
console.log
[ 1, 10 ]
[ 2, 20 ]
[ 3, 30 ]
*/