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  1. Let vs. Where - HaskellWiki -
    Haskell programmers often wonder whether to use let or where . This seems to be only a matter of taste in the sense of "Declaration vs. expression style", however there is more to it. It is important to know that let ... in ... is an ...
  2. Syntax in Functions - Learn You a Haskell for Great Good!
    This chapter will cover some of Haskell's cool syntactic constructs and we'll start with pattern matching. Pattern matching consists of specifying patterns to which some data should conform and then checking to see if it does and deconstructing  ...
  3. Haskell: Where vs. Let - Stack Overflow
    1: The problem in the example f :: State s a f = State $ \x -> y where y = ... x ... is the parameter x . Things in the where clause can refer only to the parameters of the function f (there are none) and things in outer scopes.
  4. Guards, Guards! - Functional Programming in Haskell - FutureLearn
    Haskell provides a notation for defining functions based on predicate values. f x | predicate1 = expression1 | predicate2 = expression2 | predicate3 = expression3. For instance, the absolute value of a number is its magnitude, i.e. ignoring its ...
  5. Haskell - Functions - Tutorialspoint
    Like other languages, Haskell does have its own functional definition and declaration. Function declaration consists of the function name and its argument list along with its output. Function definition is where you actually define a ...
  6. A Quick Tour of Haskell Syntax - Prajit Ramachandran
    Couple of things to notice. not is a function: it takes a boolean value, and negates it. Functions in Haskell do not require parentheses. The general syntax is ...
  7. Haskell Syntax Basics — Monday Morning Haskell
    At this point you might be thinking to yourself, “learning about types with the interpreter is fine. But I want to actually write code!” What does Haskell's syntax really look like? Luckily, that's exactly the focus of this article! We' ...
  8. Defining functions in Haskell
    Defining functions in Haskell. The most basic way of defining a function in Haskell is to ``declare'' what it does. For example, we can write: double :: Int -> Int double n = 2*n. Here, the first line specifies the type of the function and the second line ...
  9. Haskell : let expressions -
    Name, let expressions. Description, a nested, lexically-scoped, mutually- recursive list of declarations (let is often called letrec in other languages). The scope of the declarations is the expression and the right hand side of the declarations.
  10. let, where, の使い分け - BIG MOON
    2019年8月24日 ... また、様々な Haskell 書籍で同様の内容について触れられていますが、明確な指針は 無く個人の好みという感じがします。 let を使うタイミング (do の中). -- let version f :: ...
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