R/assertions.R

In zip: Cross-Platform 'zip' Compression

Defines functions is_count is_flag is_character_or_null is_character is_string

is_string <- function(x) {
  is.character(x) && length(x) == 1 && !is.na(x)
}

is_character <- function(x) {
  is.character(x) && !any(is.na(x))
}

is_character_or_null <- function(x) {
  is.null(x) || is_character(x)
}

is_flag <- function(x) {
  is.logical(x) && length(x) == 1 && !is.na(x)
}

is_count <- function(x) {
  is.numeric(x) && length(x) == 1 && !is.na(x) &&
    as.integer(x) == x
}

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