R/is.installed.R

In TobieSurette/gulf.utils: Southern Gulf of Saint Lawrence Utility Functions

#' @title Check Package Installation
#'
#' @description This function checks whether an R package(s) is installed.
#'
#' @param package.name Name(s) of the packages to be checked.
#' @return Logical value(s).
#'
#' @examples
#' # Check whether there is a 'base' and 'splines' package:
#' is.installed(c("base", "splines"))
#'
#' @export is.installed
is.installed <- function(package.name) is.element(package.name, utils::installed.packages()[,1])