Category Theory - Monad Container Implementation

category-theory-monad-container-implementation.ts

class Container<T> implements Monad<T> {
    private value: T

    constructor(value: T) {
        this.value = value
    }

    bind<U>(f: (a: T) => Monad<U>): Monad<U> {
        return f(this.value)
    }

    return(a: T): Monad<T> {
        return new Container(a)
    }
}

console.log(
    'bind container with 5 to container with 15:',
    new Container(5).bind((a) => new Container(a + 10))
) // Container { value: 15 }
console.log(
    'return:',
    new Container(undefined).return(6)
) // Container { value: 6 }