Only use the first element of a vector

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Description

If the input is not scalar, then only the first element is returned, with a warning.

Usage

1
use_first(x, indexer = c("[[", "["), .xname = get_name_in_parent(x))

Arguments

x

Input that should be scalar.

indexer

Either double indexing, "[[" (the default) or single indexing "[".

.xname

Not intended to be used directly.

Value

If x is scalar, it is returned unchanged, otherwise only the first element is returned, with a warning.

Examples

1