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It Count

docs/data/it-count.md

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Counts elements in a collection. Count counts elements equal to a value, CountBy counts elements matching a predicate.

Examples:

go
seq := func(yield func(int) bool) {
    _ = yield(1)
    _ = yield(2)
    _ = yield(2)
    _ = yield(3)
    _ = yield(2)
}
cnt := it.Count(seq, 2)
// cnt == 3
go
seq := func(yield func(string) bool) {
    _ = yield("apple")
    _ = yield("banana")
    _ = yield("apricot")
}
cnt := it.CountBy(seq, func(s string) bool {
    return len(s) > 5
})
// cnt == 2 (banana, apricot)