What is the equivalent javascript closure in c#?

Question

Consider this simple .js code:

const createCounter = () => {
    let value = 0;
    return {
        increment: () => { value += 1 },
        decrement: () => { value -= 1 },
        logValue: () => { console.log(value); }
    }
}

// Usage

const { increment, decrement, logValue } = createCounter();

I'm pretty sure c# support first class function, note that I don't want to use classes to remake the code above. What is the equivalent closure in c#?

I have made this:

public Func<WhatType?> CreateCounter = () => {
    var value = 0;
    return what?
}

Answer 1

You could use a mix of ValueTuples and lambda expressions.

private static (Action increment, Action decrement, Action logValue) CreateCounter()
{
    var value = 0;

    return
        (
            () => value += 1,
            () => value -= 1,
            () => Console.WriteLine(value)
        );
}

Usage

var (increment, decrement, logValue) = CreateCounter();
increment();
increment();
decrement();
logValue();