function* fibGenerator() {
    yield 0
    yield 1

    let [ prev, curr ] = [ 0, 1 ]
    while (true) {
        [ prev, curr ] = [ curr, prev + curr ]
        yield curr
    }
}

function fibIterator(n) {
    let count = 0
    let fibGen = fibGenerator()
    let result = []

    for (fibNum of fibGen) {
        result.push(fibNum)
        count ++

        if (count >= n) {
            break
        }
    }
    return result
}

console.log(fibIterator(10))