C#•7mo ago

Comments in curried lambda expression

Just a quick question. Do you think the comments I used here are correct? If needed I'll provide the whole code:

    public static Func<double, Func<double, double>> GetPriceCalculator(double taxRate)
    {   
        Func<double /*discount*/, Func<double /*price*/, double/*final price*/>> GetFinalPrice = discount => price => price * (1 - discount) * (1 + taxRate);
        return GetFinalPrice;
    }

    public static Func<double, Func<double, double>> GetPriceCalculator(double taxRate)
    {   
        Func<double /*discount*/, Func<double /*price*/, double/*final price*/>> GetFinalPrice = discount => price => price * (1 - discount) * (1 + taxRate);
        return GetFinalPrice;
    }

7 Replies

canton7•7mo ago

Looks correct, but took me a while to get my head around it

TahaAOP•7mo ago

understandable, that's the struggle with code that's put into one line as much as possible

canton7•7mo ago

That might well benefit from some custom delegates, with named parameters. Otherwise you're having to work out what each unnamed double actually means

TahaAOP•7mo ago

I see. Thanks

canton7•7mo ago

And PriceCalculator doesn't really capture the fact that you give it a discount, and it gives you back a function which turns a price into a final price (with discount and tax)

TahaAOP•7mo ago

yeah I know, but I was asking because this was part of a classroom assignment. It worked but I didn't know why it worked, so I was asking to be sure

canton7•7mo ago

👍

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Comments in curried lambda expression