Function or

Provide a fallback for a given Maybe. Behaves like a logical or: if the maybe value is a Just, returns that maybe; otherwise, returns the defaultMaybe value.

This is useful when you want to make sure that something which takes a Maybe always ends up getting a Just variant, by supplying a default value for the case that you currently have a nothing.

import Maybe from 'true-utils/maybe';

const justA = Maybe.just("a");
const justB = Maybe.just("b");
const aNothing: Maybe<string> = nothing();

console.log(Maybe.or(justB, justA).toString());  // Just(A)
console.log(Maybe.or(aNothing, justA).toString());  // Just(A)
console.log(Maybe.or(justB, aNothing).toString());  // Just(B)
console.log(Maybe.or(aNothing, aNothing).toString());  // Nothing
Copy