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  If \code{mode} is specified then only objects of that type are sought.
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  If \code{mode} is specified then only objects of that type are sought.
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  The \code{mode} may specify one of the collections \code{"numeric"} and
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  The \code{mode} may specify one of the collections \code{"numeric"} and
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  \code{"function"} (see \code{\link{mode}}): any member of the
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  \code{"function"} (see \code{\link{mode}}): any member of the
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  collection will suffice.  (This is true even if a member of a
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  collection will suffice.  (This is true even if a member of a
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  collection is specified, so for example \code{mode="special"} will
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  collection is specified, so for example \code{mode = "special"} will
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  seek any type of function.)
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  seek any type of function.)
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}
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}
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\value{
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\value{
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  Logical, true if and only if an object of the correct name and mode is
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  Logical, true if and only if an object of the correct name and mode is
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  found.
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  found.
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  and for yet a different kind, namely if a file exists,
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  and for yet a different kind, namely if a file exists,
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  \code{\link{file.exists}}.
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  \code{\link{file.exists}}.
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}
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}
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\examples{
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\examples{
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##  Define a substitute function if necessary:
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##  Define a substitute function if necessary:
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if(!exists("some.fun", mode="function"))
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if(!exists("some.fun", mode = "function"))
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  some.fun <- function(x) { cat("some.fun(x)\n"); x }
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  some.fun <- function(x) { cat("some.fun(x)\n"); x }
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search()
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search()
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exists("ls", 2) # true even though ls is in pos=3
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exists("ls", 2) # true even though ls is in pos = 3
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exists("ls", 2, inherits = FALSE) # false
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exists("ls", 2, inherits = FALSE) # false
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}
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}
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\keyword{data}
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\keyword{data}