Difference between revisions of "User:Lenny222/Haskell explained to the busy"

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|What is the meaning of the "'''data'''"?
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Revision as of 14:47, 29 September 2009

You have heard about Haskell but don't have the time to find out what it is?

I hope this page is for you.

Introduction

Question Answer
What is Haskell? Haskell is a purely functional, lazy, statically typed programming language.
Why the name "Haskell"? Haskell is named after the American mathematician Haskell Curry

Basics

Question Answer
What is the meaning of the dollar sign "$"? "$" is a way to avoid typing too many brackets.

For example: 

foo x = h (g (f x))

is the same as 

foo x = h $ g $ f x
What is point-free style? Point-free style is a way to define functions solely as a composition of other functions, leaving arguments in the definition out.

For example: 

takeFive x = take 5 x

is the same as 

takeFive = take 5

in point-free style.

What is the meaning of the dot "."? "." is used to compose functions in point-free style, similar to "$".

For example: 

foo x = h $ g $ f x

is the same as 

foo = h . g . f
What is the meaning of the "data"? TODO
What is the meaning of the "newtype"? TODO
What is the meaning of the "type"? TODO

Advanced

Question Answer
What is a Monad? TODO
What is the meaning of "forall"? TODO
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