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venil7/maybe_functor.ts

Last active May 7, 2019 11:17
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simple maybe functor
Raw
maybe_functor.ts
class Maybe<T> {
constructor(private val: T | null|undefined) { }
public get hasVal():boolean {
return (this.val !== null || this.val !== undefined);
}
public value(fallback: T):T {
return this.hasVal ? this.val : fallback;
}
public map<U>(func:(t: T) => U): Maybe<U> {
return this.hasVal
? new Maybe(func(this.val))
: new Maybe<U>(null);
}
}
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