It Takefilter

seq := func(yield func(int) bool) {
    yield(1)
    yield(2)
    yield(3)
    yield(4)
    yield(5)
    yield(6)
}
result := it.TakeFilter(seq, 2, func(x int) bool {
    return x%2 == 0
})
var out []int
for v := range result {
    out = append(out, v)
}
// out contains [2, 4]

result := it.TakeFilterI(seq, 2, func(x, index int) bool {
    return x%2 == 0 && index < 4
})
// out contains [2, 4]