It Foreach

seq := func(yield func(int) bool) {
    _ = yield(1)
    _ = yield(2)
    _ = yield(3)
}
var result []int
it.ForEach(seq, func(item int) {
    result = append(result, item*2)
})
// result contains 2, 4, 6

seq := func(yield func(string) bool) {
    _ = yield("hello")
    _ = yield("world")
}
it.ForEach(seq, func(item string) {
    fmt.Println("Item:", item)
})
// Prints: Item: hello
//        Item: world