Difference between revisions of "User:Lenny222/Haskell explained to the busy"
Jump to navigation
Jump to search
(→Basics) |
|||
(102 intermediate revisions by the same user not shown) | |||
Line 1: | Line 1: | ||
− | 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 == |
||
− | {| class="wikitable" |
||
− | |- |
||
− | |||
− | ! Question |
||
− | ! Answer |
||
− | |- |
||
− | |What is Haskell? |
||
− | | Haskell is a purely functional, lazy, statically typed programming language |
||
− | |- |
||
− | |What is a '''purely functional''' programming language? |
||
− | | TODO |
||
− | |- |
||
− | |What is good about a purely functional programming language? |
||
− | | TODO |
||
− | |- |
||
− | |What is a '''lazy''' programming language? |
||
− | | TODO |
||
− | |- |
||
− | |What is good about a lazy programming language? |
||
− | | TODO |
||
− | |- |
||
− | |What is a '''statically typed''' programming language? |
||
− | | TODO |
||
− | |- |
||
− | |What is good about a statically typed programming language? |
||
− | | TODO |
||
− | |- |
||
− | |Is Haskell '''Open Source'''? |
||
− | | TODO |
||
− | |- |
||
− | |Why the name '''"Haskell"'''? |
||
− | | Haskell is named after the American mathematician [http://en.wikipedia.org/wiki/Haskell_Curry Haskell Curry] |
||
− | |} |
||
− | |||
− | == Basics == |
||
− | {| class="wikitable" |
||
− | |- |
||
− | ! Question |
||
− | ! Answer |
||
− | |- |
||
− | |How do you '''define a function''' in Haskell? |
||
− | | TODO |
||
− | For example: |
||
− | <haskell>add x y = x + y</haskell> |
||
− | |- |
||
− | |Didn't you say Haskell is statically typed? |
||
− | | It is. TODO |
||
− | |- |
||
− | |What is the meaning of the '''double dash''' "'''--'''"? |
||
− | | "--" begins a single-line comment. The rest of the line will be ignored. |
||
− | For example: |
||
− | <haskell>-- sort the list |
||
− | sort [3,2,4] |
||
− | </haskell> |
||
− | or |
||
− | <haskell>sort [3,2,4] -- sort the list</haskell> |
||
− | |- |
||
− | |What is the meaning of the '''dollar''' sign "'''$'''"? |
||
− | |"$" is a way to compose functions, but avoid typing too many brackets. |
||
− | For example: |
||
− | <haskell>foo x = h (g (f x))</haskell> |
||
− | is the same as |
||
− | <haskell>foo x = h $ g $ f x</haskell> |
||
− | |- |
||
− | |What is the meaning of the '''dot''' "'''.'''"? |
||
− | |"." is used to compose functions in point-free style, similar to "$". |
||
− | For example: |
||
− | <haskell>foo x = h $ g $ f x</haskell> |
||
− | is the same as |
||
− | <haskell>foo = h . g . f</haskell> |
||
− | |- |
||
− | |What is '''point-free style'''? |
||
− | |Point-free style is a way to define functions solely as a composition of other functions, leaving out arguments in the definition. |
||
− | For example: |
||
− | <haskell>takeFive x = take 5 x</haskell> |
||
− | is the same as |
||
− | <haskell>takeFive = take 5</haskell> |
||
− | in point-free style. |
||
− | |- |
||
− | |What is the meaning of "'''data'''"? |
||
− | | TODO |
||
− | |- |
||
− | |What is the meaning of "'''newtype'''"? |
||
− | | TODO |
||
− | |- |
||
− | |What is the meaning of "'''type'''"? |
||
− | | TODO |
||
− | |- |
||
− | |What is '''currying'''? |
||
− | | TODO |
||
− | |- |
||
− | |What is '''pattern matching'''? |
||
− | | TODO |
||
− | |} |
||
− | |||
− | == Advanced == |
||
− | |||
− | {| class="wikitable" |
||
− | |- |
||
− | ! Question |
||
− | ! Answer |
||
− | |- |
||
− | |What is a '''Monad'''? |
||
− | |TODO |
||
− | |- |
||
− | |What is the meaning of "'''forall'''"? |
||
− | |TODO |
||
− | |} |