yield from a list of generators created from an array

by

You could use rest parameters ... and check the length of the rest array for another calling of the generator

function* flat(a, ...r) {
    if (Array.isArray(a)) {
        yield* flat(...a);
    } else {
        yield 'foo' + a;
    }
    if (r.length) {
        yield* flat(...r);
    }
}

var obj = [1, 2, 3, [4, 5, [6, 7, 8], 9], 10];
console.log([...flat(obj)])
.as-console-wrapper { max-height: 100% !important; top: 0; }

A similar approach but with a spread generator for calling the handed over generator with the spreaded values.

function* spread(g, a, ...r) {
    yield* g(a);
    if (r.length) {
        yield* spread(g, ...r);
    }
}

function* flat(a) {
    if (Array.isArray(a)) {
        yield* spread(flat, ...a);
    } else {
        yield 'foo' + a;
    }
}

var obj = [1, 2, 3, [4, 5, [6, 7, 8], 9], 10];
console.log([...flat(obj)])
.as-console-wrapper { max-height: 100% !important; top: 0; }

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