It Droplastwhile

collection := func(yield func(int) bool) {
    yield(1)
    yield(2)
    yield(3)
    yield(4)
    yield(5)
}

filtered := it.DropLastWhile(collection, func(x int) bool {
    return x > 3
})
var result []int
for item := range filtered {
    result = append(result, item)
}
// result contains [1, 2, 3]