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\name{is.function}
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\alias{is.function}
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\title{Is an Object of Type Function?}
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\usage{is.function(x)}
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\description{Checks whether its argument is a function.}
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\arguments{
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  \item{x}{an \R object.}
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}
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\details{
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  \code{is.function} is generic: you can write methods to handle
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  specific classes of objects, see \link{InternalMethods}.
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}
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\value{\code{TRUE} if \code{x} is a function, and \code{FALSE}
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  otherwise.}
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}
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\keyword{programming}