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It Coalesceseqorempty

docs/data/it-coalesceseqorempty.md

1.53.0699 B
Original Source

Returns the first non-empty sequence from the provided arguments, or an empty sequence if all arguments are empty.

go
emptySeq := func(yield func(int) bool) bool {
    return false // empty sequence
}
nonEmptySeq := it.Range(3)
result := it.CoalesceSeqOrEmpty(emptySeq, nonEmptySeq, emptySeq)
// iter.Seq[int] yielding 0, 1, 2

emptyStrSeq := func(yield func(string) bool) bool {
    return false // empty sequence
}
strSeq := func(yield func(string) bool) bool {
    yield("a")
    yield("b")
    return true
}
result = it.CoalesceSeqOrEmpty(emptyStrSeq, strSeq)
// iter.Seq[string] yielding "a", "b"

result = it.CoalesceSeqOrEmpty(emptySeq, emptyStrSeq)
// empty sequence (yields nothing)