abstract class MaybeState {
    public readonly isJust: boolean = false;
    public readonly isNone: boolean = false;
}

export class Just<TData> extends MaybeState {
    public readonly isJust: boolean = true;
    public readonly data: TData;

    constructor(data: TData) {
        super();
        this.data = data;
    }
}

export class None extends MaybeState {
    public readonly isNone: boolean = true;
}

export default class Maybe<TData> {
    private state: MaybeState

    constructor(data?: TData) {
        this.state = data ? new Just<TData>(data) : new None();
    }

    public setJust(data: TData) {
        this.state = new Just<TData>(data);
    }

    public setNone() {
        this.state = new None();
    }
}