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swappedNullishOrFn()

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

Swapped Nullish Coalescing (b(x) ?? a(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 fallback return of.

Returns​

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

Type Parameters​

B​

B

Parameters​

b​

(y) => B

Returns​

(c): A | NonNullable<B>

Parameters​

c​

T

Returns​

A | NonNullable<B>

Remark​

pure function

Example​

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