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% File src/library/base/man/is.language.Rd
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% File src/library/base/man/is.language.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 1995-2015 R Core Team
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% Copyright 1995-2018 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{is.language}
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\name{is.language}
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\title{Is an Object a Language Object?}
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\alias{is.language}
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\alias{is.language}
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\alias{language}
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\alias{language object}
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\alias{language object}
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\alias{language objects}
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\alias{language objects}
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\title{Is an Object a Language Object?}
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\usage{
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\usage{
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is.language(x)
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is.language(x)
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}
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}
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\description{
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\description{
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  \code{is.language} returns \code{TRUE} if \code{x} is a
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  \code{is.language} returns \code{TRUE} if \code{x} is a
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}
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}
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\note{
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\note{
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  A \code{name} is also known as \sQuote{symbol}, from its type
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  A \code{name} is also known as \sQuote{symbol}, from its type
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  (\code{\link{typeof}}), see \code{\link{is.symbol}}.
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  (\code{\link{typeof}}), see \code{\link{is.symbol}}.
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  If \code{\link{typeof}(x) == "language"}, then \code{is.language(x)}
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  is always true, but the reverse does not hold as expressions or
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  names \code{y} also fulfill \code{is.language(y)}, see the examples.
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  This is a \link{primitive} function.
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  This is a \link{primitive} function.
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}
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}
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\references{
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\references{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \emph{The New S Language}.
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  \emph{The New S Language}.