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expression n) or (case expression is when value_list 1 => expression 1 when value_list 2 => expression 2 ... «when others => expression n ») Seed7: if condition then statements «else statements» end if: if condition 1 then statements elsif condition 2 then statements... «else statements» end if: case expression of when set1 : statements ...
In Haskell, indentation can be used in several syntactic constructs, including do, let, case, class, and instance. The use of indentation to indicate program structure originates in Peter J. Landin 's ISWIM language, where it was called the off-side rule .
1 2 3 Case-expressions in Haskell and match-expressions in F# and Haskell allow both switch-case and pattern matching usage. ^ In a Ruby case construct, regular expression matching is among the conditional flow-control alternatives available.
Ruby: as last object of line; comment may follow operator; AutoHotkey: As the first character of continued line; any expression operators except ++ and --, and a comma or a period [7] Some form of line comment serves as line continuation. Turbo Assembler: \ m4: dnl; TeX: % Character position
This idea is central to Haskell's IO monad, where an object of type IO a can be seen as describing an action to be performed in the world, optionally providing information about the world of type a. An action that provides no information about the world has the type IO () , "providing" the dummy value () .
Hugs deviates from the Haskell 98 specification [2] in several minor ways. [3] For example, Hugs does not support mutually recursive modules. A list of differences exists. [4] The Hugs prompt is a Haskell read–eval–print loop (REPL). It accepts expressions for evaluation, but not module, type, or function definitions.
a list is a matched pair of parentheses, with zero or more expressions inside it. Here the decimal digits, upper- and lower-case characters, and parentheses are terminal symbols. The following are examples of well-formed token sequences in this grammar: '12345', '()', '(A B C232 (1))'
Filter is a standard function for many programming languages, e.g., Haskell, [1] OCaml, [2] Standard ML, [3] or Erlang. [4] Common Lisp provides the functions remove-if and remove-if-not . [ 5 ] Scheme Requests for Implementation (SRFI) 1 provides an implementation of filter for the language Scheme . [ 6 ]