state-monad-ts/dist/state.d.ts

state monad in typescript

export declare type RunState<S, A> = (s: S) => [A, S];
export declare type Unit = null;
export declare const unit: Unit;
export declare class State<S, A> {
    readonly [Symbol.toStringTag] = "StateMoand";
    runState: RunState<S, A>;
    execState: (s: S) => S;
    evalState: (s: S) => A;
    constructor(runState: RunState<S, A>);
    map<B>(f: (p: A) => B): State<S, B>;
    static pure<S, A>(a: A): State<S, A>;
    ap<B>(fa: State<S, (x: A) => B>): State<S, B>;
    static return: typeof State.pure;
    bind<B>(f: (a: A) => State<S, B>): State<S, B>;
    then: <B>(f: (a: A) => State<S, B>) => State<S, B>;
    get(): this;
    put(s: S): State<S, null>;
    modify(f: (s: S) => S): State<S, null>;
}