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Diffstat (limited to 'src')
-rw-r--r-- | src/gleam/result.gleam | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/gleam/result.gleam b/src/gleam/result.gleam index b686939..88f933a 100644 --- a/src/gleam/result.gleam +++ b/src/gleam/result.gleam @@ -176,3 +176,26 @@ pub fn unwrap(result: Result(a, e), or default: a) -> a { pub fn nil_error(result: Result(a, e)) -> Result(a, Nil) { map_error(result, fn(_) { Nil }) } + +/// Return the first value if it is Ok, otherwise return the second value. +/// +/// ## Examples +/// +/// > or(Ok(1), Ok(2)) +/// Ok(1) +/// +/// > or(Ok(1), Error("Error 2")) +/// Ok(1) +/// +/// > or(Error("Error 1"), Ok(2)) +/// Ok(2) +/// +/// > or(Error("Error 1"), Error("Error 2")) +/// Error("Error 2") +/// +pub fn or(first: Result(a, e), second: Result(a, e)) -> Result(a, e) { + case first { + Ok(_) -> first + Error(_) -> second + } +} |