Contribution:
haskellLambda
Headline
Anonymous functions in Haskell
Characteristics
The contribution demonstrates functional programming in Haskell. Specifically, anonymous functions in the form lambda abstractions are put to work as arguments of higher-order functions for list processing.
Illustration
Anonymous functions are functions without name. They can be used as "in-place" arguments of higher-order functions, thereby eliminating the need of a definition in a local or a global scope, thereby making some definitions more concise. For comparison, consider the following functions for totaling salaries, as part of Contribution:haskellWhere:
-- Total all salaries in a company
total :: Company -> Float
total (n, es) = sum (map totalE es)
-- Extract the salary from an employee
totalE :: Employee -> Float
totalE ( , , s) = s
When anonymous functions are put to work, then the same functionality is implemented as follows:
-- Total all salaries in a company
total :: Company -> Float
total (n, es) = sum (map (\( , ,s) -> s) es)
Thus, the named helper function totalE is gone; map is applied instead to an anonymous function.
Relationships
- The present contribution revises Contribution:haskellList to use anonymous functions in combination with map and friends.
- The present contribution is thus also a variation on Contribution:haskellEngineer.
Architecture
See Contribution:haskellEngineer.
Usage
(C) 2012-2024 softlang.org and contributors
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