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aryelgois/maybeCall.ts

Last active August 22, 2022 19:22
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maybeCall.ts
type UnaryFn<T, R> = (param: T) => R
export function maybeCall<T, R>(fn: UnaryFn<T, R>): UnaryFn<T | null, R | null>;
export function maybeCall<T, R>(fn: UnaryFn<T, R>, value: T | null): R | null;
export function maybeCall<T, R>(fn: UnaryFn<T, R>, value?: T | null) {
if (value === undefined) {
return (v: T | null) => maybeCall(fn, v)
}
return value !== null ? fn(value) : null
}
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