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% File src/library/base/man/function.Rd
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% File src/library/base/man/function.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2012 R Core Team
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% Copyright 1995-2021 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{function}
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\name{function}
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\alias{function}
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\alias{function}
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\alias{return}
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\alias{return}
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\alias{closure}
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\alias{closure}
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\title{Function Definition}
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\title{Function Definition}
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\usage{
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\usage{
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\special{function( arglist ) expr}
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\special{function( arglist ) expr}
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\special{\\( arglist ) expr}
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\special{return(value)}
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\special{return(value)}
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}
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}
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\description{
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\description{
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  These functions provide the base mechanisms for defining
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  These functions provide the base mechanisms for defining
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  new functions in the \R language.
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  new functions in the \R language.
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  the evaluation frame of the function and before any
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  the evaluation frame of the function and before any
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  \code{\link{on.exit}} expression is evaluated.)
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  \code{\link{on.exit}} expression is evaluated.)
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  If the end of a function is reached without calling \code{return}, the
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  If the end of a function is reached without calling \code{return}, the
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  value of the last evaluated expression is returned.
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  value of the last evaluated expression is returned.
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  The shorthand form \code{\\(x) x + 1} is parsed as \code{function(x) x
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    + 1}. It may be helpful in making code containing simple function
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  expressions more readable.
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}
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}
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\note{ \bold{The shorthand function notation is experimental and may change
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    prior to release.} }
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\section{Technical details}{
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\section{Technical details}{
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  This type of function is not the only type in \R: they are called
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  This type of function is not the only type in \R: they are called
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  \emph{closures} (a name with origins in LISP) to distinguish them from
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  \emph{closures} (a name with origins in LISP) to distinguish them from
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  \link{primitive} functions.
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  \link{primitive} functions.