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It Findorelse

docs/data/it-findorelse.md

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Searches for an element using a predicate or returns a fallback value if not found.

Examples:

go
seq := func(yield func(int) bool) {
    _ = yield(10)
    _ = yield(20)
    _ = yield(30)
    _ = yield(40)
}
result := it.FindOrElse(seq, 99, func(x int) bool {
    return x > 25
})
// result == 30
go
seq := func(yield func(string) bool) {
    _ = yield("apple")
    _ = yield("banana")
    _ = yield("cherry")
}
result := it.FindOrElse(seq, "unknown", func(s string) bool {
    return len(s) > 10
})
// result == "unknown" (fallback value)