Allows you to contain temporary variables to where they are needed, rather than having them remain active through the remainder of the current scope. You could do that with immediately invoked function expressions, but they are too verbose to be really viable for this. You could also use extra functions, but extra functions don't always make sense. Currently I'm frequently doing this:

Without do expression:

    let result;
    {
        let tmp = 123;

        result = tmp * 2;
    }

    let result = do {
        let tmp = 123;
     
        tmp * 2;
    }