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functional: add undefined checker

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Yingchi Long
2024-07-19 18:08:07 +08:00
parent 78f4885647
commit 5484a49166
1 changed files with 8 additions and 0 deletions
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8
src/functional.ts
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@@ -6,3 +6,11 @@ export const sequence = <T, U>(fn: ($: T) => Promise<U>) => async (L: T[]) => {
export const parallel = <T, U>(fn: ($: T) => Promise<U>) => async (L: T[]) => { export const parallel = <T, U>(fn: ($: T) => Promise<U>) => async (L: T[]) => {
await Promise.all(L.map(fn)); await Promise.all(L.map(fn));
}; };
export const notUndefined: <T>($: T | undefined) => T = $ => {
if ($ === undefined)
throw Error('the value is undefined!');
else
return $;
};