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

Architecture

See Contribution:haskellEngineer.

Usage

See Contribution:haskellEngineer.

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