Function definition that is not bound to an identifier
In computer programming, an anonymous function (function literal, lambda abstraction, lambda function, lambda expression or block) is a function definition that is not bound to an identifier. Anonymous functions are often arguments being passed to higher-order functions or used for constructing the result of a higher-order function that needs to return a function.[1]
If the function is only used once, or a limited number of times, an anonymous function may be syntactically lighter than using a named function. Anonymous functions are ubiquitous in functional programming languages and other languages with first-class functions, where they fulfil the same role for the function type as literals do for other data types.
Anonymous functions originate in the work of Alonzo Church in his invention of the lambda calculus, in which all functions are anonymous, in 1936, before electronic computers.[2] In several programming languages, anonymous functions are introduced using the keyword lambda, and anonymous functions are often referred to as lambdas or lambda abstractions. Anonymous functions have been a feature of programming languages since Lisp in 1958, and a growing number of modern programming languages support anonymous functions.
^"Higher order functions". learnyouahaskell.com. Retrieved 3 December 2014.
^Fernandez, Maribel (2009), Models of Computation: An Introduction to Computability Theory, Undergraduate Topics in Computer Science, Springer Science & Business Media, p. 33, ISBN 9781848824348, The Lambda calculus ... was introduced by Alonzo Church in the 1930s as a precise notation for a theory of anonymous functions
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programming, an anonymousfunction (function literal, lambda abstraction, lambda function, lambda expression or block) is a function definition that is...
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defines a ByteArray of four integers. And last but not least, blocks (anonymousfunction literals) [... Some smalltalk code...] Blocks are explained in detail...
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Lambda expression in computer programming, also called an anonymousfunction, is a defined function not bound to an identifier. Lambda expression in lambda...
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