Anonymous function: Difference between revisions

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== Names ==

The names "lambda abstraction", "lambda function", and "lambda expression" refer to the notation of function abstraction in lambda calculus, where the usual function {{math|1={{itco|''f''}}(''x'') = ''M''}} would be written {{math|1=(λ''x''.{{itco|''M''}})}}, and where ({{mvar|M}} is an expression that uses {{mvar|x}}). Compare to the Python syntax of <syntaxhighlight lang=python inline>lambda x: M</syntaxhighlight>.

The name "arrow function" refers to the mathematical "[[Maplet|maps to]]" symbol, {{math|''x'' ↦ ''M''}}. Compare to the JavaScript syntax of <syntaxhighlight lang=js inline>x => M</syntaxhighlight>.<ref>{{cite web |title=Arrow function expressions - JavaScript |url=https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions |access-date=August 21, 2019 |website=MDN |language=en-US}}</ref>