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Diffstat (limited to 'src')
| -rw-r--r-- | src/gleam/result.gleam | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/gleam/result.gleam b/src/gleam/result.gleam index 76ee0e1..c381cae 100644 --- a/src/gleam/result.gleam +++ b/src/gleam/result.gleam @@ -165,6 +165,24 @@ pub fn unwrap(result: Result(a, e), or default: a) -> a { } } +/// Extract the Ok value from a result, evaluating the default function if the result +/// is an Error. +/// +/// ## Examples +/// +/// > unwrap(Ok(1), fn() { 0 }) +/// 1 +/// +/// > unwrap(Error(""), fn() { 0 }) +/// 0 +/// +pub fn lazy_unwrap(result: Result(a, e), or default: fn() -> a) -> a { + case result { + Ok(v) -> v + Error(_) -> default() + } +} + /// Transforms any error into Error(Nil) /// /// ## Examples |