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nullishOrFn()

nullishOrFn<T, A>(a): <B>(b) => (c) => B | NonNullable<A>

Nullish Coalescing (a(x) ?? b(x)).

Type Parameters​

T​

T

The type of the input value of the functions.

A​

A

The return type of the first function.

Parameters​

a​

(x) => A

The function to get the, possibly null, return of.

Returns​

<B>(b): (c) => B | NonNullable<A>

Type Parameters​

B​

B

Parameters​

b​

(y) => B

Returns​

(c): B | NonNullable<A>

Parameters​

c​

T

Returns​

B | NonNullable<A>

Remark​

pure function

Example​

nullishOrFn(x => x.foo)(x => x.bar)({ bar: 4 });
// 4