In this section, we will review the Template Haskell features to write meta programs. The following sample code shows how you can add two integer numbers in Haskell − main = do let var1 = 2 let var2 = 3 putStrLn "The addition of the two numbers is:" print(var1 + var2) In the above file, we have created two separate variables var1 and var2. Code Example #1 I've seen beginners on /r/haskell ask for practical code examples so I thought I would share some code from my own work. I was just exploring haste / client side javascript generation from Haskell, and encountered this. You can type most math expressions directly into ghci and get an answer. Earlier we gave several examples of pattern matching in defining functions---for example length and fringe.In this section we will look at the pattern-matching process in greater detail (). There’s a lot more to Haskell, including typeclasses and monads. Prelude> is the default GHCi prompt. Developed to be suitable for teaching, research and industrial application, Haskell has pioneered a number of advanced programming language features. Code, collaborate, compile, run, share, and deploy Haskell online from your browser

Today's example will focus on how you can use Haskell to write clear and self-documenting code. The result of this list comprehension is "HELLO". (Of course, in this simple example you would just write map toUpper s.) Examples.

Here is a transcript that shows how you'd create a minimal git and cabalised Haskell project for the cool new Haskell program "haq", build it, install it and release.

4 Case Expressions and Pattern Matching.

I am not sure if this is the correct fix, but compiles and runs. See Structure of a Haskell project for an example of a larger project's directory structure. The first set of examples show-cases Template Haskell's potential as a code generator; the second set of examples highlights its facilities to … Its type is: foldr :: (a -> b -> b) -> b -> [a] -> b Strings in Haskell are lists of characters; the generator c <-s feeds each character of s in turn to the left-hand expression toUpper c, building a new list. foldr begins at the right-hand end of the list and combines each list entry with the accumulator value using the function you give it. The second is an interpreter that lets you write Haskell code and get feedback right away. As the name suggests, the addition (+) operator is used for addition function. Haskell / ˈhæskəl / is a general-purpose, statically typed, purely functional programming language with type inference and lazy evaluation. These are the big ideas that make Haskell such fun to code in. An introductory set of slides full of example code for an undergraduate course in Haskell. The first compiles Haskell libraries or applications to binary code. I've created a patch for the one example I was working on. Template Haskell by Examples. Looks like some changes made from String to JSStr broke at least this example.