In computer science, a programming language is said to support first-class functions (or function literals) if it treats functions as first-class objects. Specifically, this means that the language supports constructing new functions during the execution of a program, storing them in data structures, passing them as arguments to other functions, and returning them as the values of other functions.
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- In computer science, a programming language is said to support first-class functions (or function literals) if it treats functions as first-class objects. Specifically, this means that the language supports constructing new functions during the execution of a program, storing them in data structures, passing them as arguments to other functions, and returning them as the values of other functions. This concept doesn't cover any means external to the language and program, such as invoking a compiler or an eval function to create a new function. These features are a necessity for the functional programming style, in which (for instance) the use of higher-order functions is a standard practice. A simple example of a higher-ordered function is the map or mapcar function, which takes as its arguments a function and a list, and returns the list formed by applying the function to each member of the list. For a language to support map, it must support passing a function as an argument. There are certain implementation difficulties in passing functions as arguments and returning them as results. Historically, these were termed the funarg problems, the name coming from "function argument".
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- In computer science, a programming language is said to support first-class functions (or function literals) if it treats functions as first-class objects. Specifically, this means that the language supports constructing new functions during the execution of a program, storing them in data structures, passing them as arguments to other functions, and returning them as the values of other functions.
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