Friday Programming Quiz [modified]
-
Very nice quiz for functional languages :-). In F# it looks like this:
let drinks = [
("Anna Kournikova", ["Vodka"; "Kahlua"; "Skim Milk"]);
("Flaming Dr Pepper", ["Beer"; "151 Rum"; "Amaretto"]);
("Pina Colada", ["Rum"; "Coconut Juice"; "Pineapple Juice"]);
("Mint Julep", ["Mint"; "Bourbon"; "Sugar"])];;
let ingred =
["Vodka"; "Rum"; "151 Rum"; "Beer"; "Amaretto";
"Kahlua"; "Skim Milk"; "Mint"; "Sugar"];;let ingset = Set.of_list ingred;;
drinks |> List.filter (fun (_, ing) -> ing |> Seq.for_all ingset.Contains )
|> List.map fst;;Homepage: TomasP.net | Photo of the month: Calendar | C# and LINQ, F#, Phalanger: My Blog
Latest article: Phalanger, PHP for .NET: Introduction for .NET developersX| I took functional programming as a module in the final year of my degree, 13 years ago. I thought it would be "interesting" compared to some of the other more essay-based modules. Hoo boy, it was interesting alright! We were using a language called Gopher IIRC. During the 3 hour final exam, most people (including myself) had left before the first hour was up, unable to answer most of the questions. There was an inquiry into the difficulty of the exam paper after this, and the papers were re-evaluated and marked up. It looked like an interesting idea, but I've yet to see anything useful written in it... As wikipedia[^] states, it finds most application in academia rather than commercial software development. And IMHO, it should stay in academia too - well away from me! ;P
Sunrise Wallpaper Project | The StartPage Randomizer | A Random Web Page
-
Very nice quiz for functional languages :-). In F# it looks like this:
let drinks = [
("Anna Kournikova", ["Vodka"; "Kahlua"; "Skim Milk"]);
("Flaming Dr Pepper", ["Beer"; "151 Rum"; "Amaretto"]);
("Pina Colada", ["Rum"; "Coconut Juice"; "Pineapple Juice"]);
("Mint Julep", ["Mint"; "Bourbon"; "Sugar"])];;
let ingred =
["Vodka"; "Rum"; "151 Rum"; "Beer"; "Amaretto";
"Kahlua"; "Skim Milk"; "Mint"; "Sugar"];;let ingset = Set.of_list ingred;;
drinks |> List.filter (fun (_, ing) -> ing |> Seq.for_all ingset.Contains )
|> List.map fst;;Homepage: TomasP.net | Photo of the month: Calendar | C# and LINQ, F#, Phalanger: My Blog
Latest article: Phalanger, PHP for .NET: Introduction for .NET developersTomas Petricek wrote:
Very nice quiz for functional languages
I agree - I used Haskell rather than F# (and algebraic data types rather than just lists):
module Cocktails where ingredients = ["Vodka", "Rum", "151 Rum", "Beer", "Amaretto", "Kahlua", "Skim Milk", "Mint", "Sugar"] data Cocktail = Recipe { name::String, uses::[String]} deriving (Show) recipes = [ Recipe "Anna Kournikova" ["Vodka", "Kahlua", "Skim Milk"], Recipe "Flaming Dr Pepper" ["Beer", "151 Rum", "Amaretto"], Recipe "Pina Colada" ["Rum", "Coconut Juice", "Pineapple Juice"], Recipe "Mint Julep" ["Mint", "Bourbon", "Sugar"]] haveIngredients i (Recipe _ uses) = all (`elem` i) uses canMake recipes ingredients = map name $ filter (haveIngredients ingredients) recipesMmmmmm - Haskell :)
-
X| I took functional programming as a module in the final year of my degree, 13 years ago. I thought it would be "interesting" compared to some of the other more essay-based modules. Hoo boy, it was interesting alright! We were using a language called Gopher IIRC. During the 3 hour final exam, most people (including myself) had left before the first hour was up, unable to answer most of the questions. There was an inquiry into the difficulty of the exam paper after this, and the papers were re-evaluated and marked up. It looked like an interesting idea, but I've yet to see anything useful written in it... As wikipedia[^] states, it finds most application in academia rather than commercial software development. And IMHO, it should stay in academia too - well away from me! ;P
Sunrise Wallpaper Project | The StartPage Randomizer | A Random Web Page
The basic idea of functional programming (i.e. functions are first class types) is incredibly useful. Add currying and closures into the mix and you have something even more incredibly useful. The tricky thing with most functional languages is the immutability of data, which is what gives referential transparency (which is useful for other reasons) - however, that's not necessary for getting at least some of the benefits of FP. C++ with Boost.Function[^] and Boost.Lambda[^] does the job for me when I'm at work.
-
Here's an oddball language. Prolog. We did a similar solution involving restaurants and meals in my programming languages class a few quarters ago. Here's the adaptation for this problem. (I'm half betting/half hoping that nobody will actually plug this into a prolog interpreter...as I didn't actually check any of it. ;P This should work though.)
item(Vodka).
item(Rum).
item(OneFiftyOneRum).
item(Beer).
item(Amaretto).
item(Kahlua).
item(SkimMilk).
item(Mint).
item(Sugar).
item(CoconutJuice).
item(PineappleJuice);
item(Bourbon).drink(AnnaKournikova, [Vodka, Kahlua, SkimMilk]).
drink(FlamingDrPepper, [Beer, OneFiftyOneRum, Amaretto]).
drink(PinaColada, [Rum, CoconutJuice, PineappleJuice]).
drink(MintJulep, [Mint, Bourbon, Sugar]).stock([Vodka, Rum, OneFiftyOneRum, Beer, Amaretto, Kahlua, SkimMilk, Mint, Sugar]).
% Determines if the Drink is made with the given Ingredients
canBeMade(Drink, Ingredients) :-
drink(Drink, ActualIngredients), % Get the ingredients in the meal
intersection(ActualIngredients, Ingredients, Intersect), % Get the intersection of the actual ingredients with the specified ingredients
ActualIngredients = Intersect. % Check that they're equal% Print a list
print_list([]).
print_list([H|T]) :- print(H), print_list(T).:- print_list(canBeMade(_, stock)).
Last modified: 28mins after originally posted --
We are certainly uncertain at least I'm pretty sure I am...
David Stone wrote:
% Print a list print_list([]). print_list([H|T]) :- print(H), print_list(T).Does Prolog not have a
mapfunction? -
X| I took functional programming as a module in the final year of my degree, 13 years ago. I thought it would be "interesting" compared to some of the other more essay-based modules. Hoo boy, it was interesting alright! We were using a language called Gopher IIRC. During the 3 hour final exam, most people (including myself) had left before the first hour was up, unable to answer most of the questions. There was an inquiry into the difficulty of the exam paper after this, and the papers were re-evaluated and marked up. It looked like an interesting idea, but I've yet to see anything useful written in it... As wikipedia[^] states, it finds most application in academia rather than commercial software development. And IMHO, it should stay in academia too - well away from me! ;P
Sunrise Wallpaper Project | The StartPage Randomizer | A Random Web Page
I admit that my code may look a bit scary because I used a few "advanced" functional tricks, but once you get the idea than it is easy to understand and easy to write. When I attended my functional programming class I didn't understand anythin either and I wasn't very interested in playing with it to learn it because it is quite difficult to do anything fancy in Haskell, but than I started playing with F# which is a lot of fun because you can use everything from .NET so it's very easy to start... Anyway, I think that functional programming is slowly getting into a real world - look at C# 3.0 or Python - they both have quite a lot functional concepts in them...
Homepage: TomasP.net | Photo of the month: Calendar | C# and LINQ, F#, Phalanger: My Blog
Latest article: Phalanger, PHP for .NET: Introduction for .NET developers -
David Stone wrote:
% Print a list print_list([]). print_list([H|T]) :- print(H), print_list(T).Does Prolog not have a
mapfunction?I'm sure it does...but we weren't allowed to use it in the programming languages class I was in. Since I just copied the code wholesale, I figured I'd include that. ;)
We are certainly uncertain at least I'm pretty sure I am...
-
I'm sure it does...but we weren't allowed to use it in the programming languages class I was in. Since I just copied the code wholesale, I figured I'd include that. ;)
We are certainly uncertain at least I'm pretty sure I am...
David Stone wrote:
Since I just copied the code wholesale, I figured I'd include that.
Hey - code reuse - can't criticise that :)
-
Here's my entry: http://www.shog9.com/drinks/drinks.html [^] (Firefox only. Kinda works in Opera, IE throws away newlines, which kinda defeats the purpose of including a parser) The code is terrible, and i freely admit it; also, it doesn't quite work the way you described it... but i like how it works, so i just kinda went with it. As a bonus, it also has the proper ingredient list for a mint julep... :rolleyes: Now, if you'll excuse me, all this coding has made me thirsty...
----
i hope you are feeling sleepy for people not calling you by the same.
--BarnaKol on abusive words
I like the way it displays potential recipes, the way it uses color/font weights to differentiate recipes and best of it all, the way it sorts recipes by ingredient availability. I love it :)
Regards Senthil [MVP - Visual C#] _____________________________ My Blog | My Articles | My Flickr | WinMacro
-
I like the way it displays potential recipes, the way it uses color/font weights to differentiate recipes and best of it all, the way it sorts recipes by ingredient availability. I love it :)
Regards Senthil [MVP - Visual C#] _____________________________ My Blog | My Articles | My Flickr | WinMacro
-
Assuming that low a number of ingredients, you could write code that assigns a bit to each ingredient, and a field with the bits set for the ingredients that each cocktail needs. Then you can very simply work out which ones you have the ingredients for, without having to write much code at all. Anna Kournikova is a cocktail ? Yummy.
Christian Graus - Microsoft MVP - C++ Metal Musings - Rex and my new metal blog "I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )