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What does exclamation mark mean in Haskell?
It’s a strictness declaration. Basically, it means that it must be evaluated to what’s called “weak head normal form” when the data structure value is created.
What does -> mean in Haskell?
(->) is often called the “function arrow” or “function type constructor“, and while it does have some special syntax, there’s not that much special about it. It’s essentially an infix type operator. Give it two types, and it gives you the type of functions between those types.
Haskell in 100 Seconds
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What is at symbol in Haskell?
IHP uses lots of GHC language extensions to create the “magic” that comes along with the framework. One the the first nonstandard language extensions you’ll come across while developing with IHP is the fancy “@” symbol.
What does || mean in Haskell?
Example: main = do. print(“Demo to show or operator in Haskell !!”) print(“Below we are using || operator for checking expression“)
What does <$> mean in Haskell?
It’s merely an infix synonym for fmap , so you can write e.g. Prelude> (*2) <$> [1.. 3] [2,4,6] Prelude> show <$> Just 11 Just “11” Like most infix functions, it is not built-in syntax, just a function definition. But functors are such a fundamental tool that <$> is found pretty much everywhere.
What does Unwords do in Haskell?
| Module: | Prelude |
|---|---|
| Function: | unwords |
| Type: | [String] -> String |
| Description: | creates a string from an array of strings, it inserts space characters between original strings |
| Related: |
What does ++ mean in Haskell?
The ++ operator is the list concatenation operator which takes two lists as operands and “combine” them into a single list.
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Syntax in Functions – Learn You a Haskell for Great Good!
The _ means the same thing as it does in list comprehensions. It means that we really don’t care what that part is, so we just write a _.
CS43 – Expressions, Values, and Types – Class
In Haskell functions are applied simply by writing them before their arguments. The only exception is infix functions like + which are written between their …
dollar sign – Type Classes
The dollar sign, $ , is a controversial little Haskell operator. Semantically, it doesn’t mean much, and its type signature doesn’t give you a hint of why …
Yet Another Haskell Tutorial/Language basics – Wikibooks
On the right-hand side, we give the definition of makeList . In Haskell, the colon operator is used to create lists (we’ll talk more about this soon). This …
What does <*> Do in Haskell?
<*> takes a functor that contains a function taking an a and returning a b , and a functor that contains an a , and it returns a functor that contains a b . So <*> kind of extract the function from a functor and applies it to an arguments also inside a functor, and finally returns the result into a functor.
What does colon mean in Haskell?
In Haskell, the colon operator is used to create lists (we’ll talk more about this soon). This right-hand side says that the value of makeList is the element 1 stuck on to the beginning of the value of makeList .
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What are guards in Haskell?
Haskell guards are used to test the properties of an expression; it might look like an if-else statement from a beginner’s view, but they function very differently. Haskell guards can be simpler and easier to read than pattern matching .
What is Fmap in Haskell?
You can think of fmap as either a function that takes a function and a functor and then maps that function over the functor, or you can think of it as a function that takes a function and lifts that function so that it operates on functors. Both views are correct and in Haskell, equivalent.
What is Foldr in Haskell?
From HaskellWiki. The foldr function applies a function against an accumulator and each value of a Foldable structure from right to left, folding it to a single value. foldr is a method of the Foldable typeclass: foldr (++) [] [[0, 1], [2, 3], [4, 5]] — returns [0, 1, 2, 3, 4, 5]
What is mod in Haskell?
mod : Returns the modulus of the two numbers. This is similar to the remainder but has different rules when “div” returns a negative number.
What does concatMap do in Haskell?
| Module: | Prelude |
|---|---|
| Function: | concatMap |
| Type: | (a -> [b]) -> [a] -> [b] |
| Description: | creates a list from a list generating function by application of this function on all elements in a list passed as the second argument |
| Related: |
What does Unlines do in Haskell?
| Module: | Prelude |
|---|---|
| Function: | unlines |
| Type: | [String] -> String |
| Description: | creates a string from an array of strings, it inserts new line characters between original strings |
| Related: |
What does drop do in Haskell?
Drop a given number of elements in order, beginning with the smallest ones. O(n) drop n, applied to a Text, returns the suffix of the Text after the first n characters, or the empty Text if n is greater than the length of the Text.
Haskell Tutorial
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What is getLine in Haskell?
This example uses the action getLine ( getLine :: IO String ) which reads a line of input from the console. The do-block makes an action that, when invoked, invokes the getLine , takes its result and invokes the action putStrLn (“you said: ” ++ line) with the previous result bound to line .
How are types used in Haskell?
In Haskell, every statement is considered as a mathematical expression and the category of this expression is called as a Type. You can say that “Type” is the data type of the expression used at compile time. To learn more about the Type, we will use the “:t” command.
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