It Filter - Lo — ContextQMD

Returns a sequence of all elements for which the predicate function returns true.

Filter

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

FilterI

FilterI iterates over elements of collection, returning a sequence of all elements predicate returns true for. The predicate function includes the index.

result := it.FilterI(it.Range(1, 6), func(item int, index int) bool {
    return item%2 == 0 && index > 1
})
var filtered []int
for v := range result {
    filtered = append(filtered, v)
}
// filtered contains [4, 6]