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mapOrAsyncForUndefinable

Return the result of transformer with using input as an argument for it if input is not undefined. Otherwise, return defaultValue.

Basically, this operation is a combination map() and unwrapOr().

  • U must not be Undefinable<*>.
    • If the result of transformer is undefined, this throw an Error.
    • If the result of defaultValue is undefined, this throw an Error.
  • If you'd like to accept Undefinable<*> as U, use a combination andThen() and or().
function mapOrAsyncForUndefinable<T, U>(
input: Undefinable<T>,
defaultValue: NotUndefined<U>,
transformer: AsyncTransformFn<T, NotUndefined<U>>,
): Promise<NotUndefined<U>>;
§
mapOrAsyncForUndefinable<T, U>(input: Undefinable<T>, defaultValue: NotUndefined<U>, transformer: AsyncTransformFn<T, NotUndefined<U>>): Promise<NotUndefined<U>>
[src]

§Type Parameters

§Parameters

§
defaultValue: NotUndefined<U>
[src]
§
transformer: AsyncTransformFn<T, NotUndefined<U>>
[src]

§Return Type