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Implement fromNullable for Maybe #13

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Merged
lazamar merged 3 commits into from
Nov 25, 2025
Merged

Implement fromNullable for Maybe #13

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37e077a
Implement fromNullable for Maybe
lazamar Nov 24, 2025
0812e5f
Fix implementation
lazamar Nov 24, 2025
0984bfd
Add NonNullable constraint
lazamar Nov 24, 2025
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9 changes: 9 additions & 0 deletions ambar-core/src/maybe.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@ export {
CallableJust as Just,
CallableNothing as Nothing,
from,
fromNullable,
catMaybes,
mapMaybe,
};
Expand Down Expand Up @@ -99,6 +100,14 @@ function from<T>(v: undefined | T): Maybe<T> {
}
}

function fromNullable<T>(v: NonNullable<T> | null): Maybe<T> {
if (v === null) {
return new Nothing();
} else {
return new Just(v);
}
}

// Remove Nothings from an array.
function catMaybes<T>(xs: Array<Maybe<T>>): Array<T> {
const r: Array<T> = [];
Expand Down