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In the § More complex examples section above, calc is used in two senses, showing that there is a Haskell type class namespace and also a namespace for values: a Haskell type class for calc. The domain and range can be explicitly denoted in a Haskell type class. a Haskell value, formula, or expression for calc.
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.
An Introduction to Functional Programming Systems Using Haskell. Cambridge University Press. ISBN 978-0-521-25830-2. Bird, Richard (1998). Introduction to Functional Programming using Haskell (2nd ed.). Prentice Hall Press. ISBN 978-0-13-484346-9. Hudak, Paul (2000). The Haskell School of Expression: Learning Functional Programming through ...
The detailed semantics of "the" ternary operator as well as its syntax differs significantly from language to language. A top level distinction from one language to another is whether the expressions permit side effects (as in most procedural languages) and whether the language provides short-circuit evaluation semantics, whereby only the selected expression is evaluated (most standard ...
In Haskell this is the foldl' (note the apostrophe, pronounced 'prime') function in the Data.List library (one needs to be aware of the fact though that forcing a value built with a lazy data constructor won't force its constituents automatically by itself). Combined with tail recursion, such folds approach the efficiency of loops, ensuring ...
Hugs (Haskell User's Gofer System), also Hugs 98, is a bytecode interpreter for the functional programming language Haskell. Hugs is the successor to Gofer, and was originally derived from Gofer version 2.30b. [1] Hugs and Gofer were originally developed by Mark P. Jones, now a professor at Portland State University.
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As of GHC-6.10, Template Haskell provides support for user-defined quasi-quoters, which allows users to write parsers which can generate Haskell code from an arbitrary syntax. This syntax is also enforced at compile time. For example, using a custom quasi-quoter for regular expressions could look like this: