Check whether an object is empty, e.g. has no sub-elements, is NA, or is the empty string.
is_empty(x)
An object.
is_empty(NA) # TRUE is_empty("") # TRUE is_empty(list()) # TRUE is_empty(list(list())) # TRUE is_empty(1) # FALSE is_empty(list(1)) # FALSE is_empty(list(list(1))) # FALSE
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