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\code{is.null} returns \code{TRUE} if its argument
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\code{is.null} returns \code{TRUE} if its argument
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is \code{NULL} and \code{FALSE} otherwise.
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is \code{NULL} and \code{FALSE} otherwise.
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}
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}
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\details{
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\details{
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  \code{is.null} is generic: you can write methods to handle
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  \code{is.null} is generic: you can write methods to handle
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  of specific classes of objects, see \link{InternalMethods}.
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  specific classes of objects, see \link{InternalMethods}.
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}
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}
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\arguments{
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\arguments{
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  \item{x}{an object to be tested or coerced.}
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  \item{x}{an object to be tested or coerced.}
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  \item{\dots}{ignored.}
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  \item{\dots}{ignored.}
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}
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}