Do all items in a list or vector return TRUE from a predicate function?

Do all items in a list or vector return TRUE from a predicate function?

• is_all_null(): Are all items in a list or vector NULL values?

• is_all_na(): Are all items in a list or vector NA values?

Usage

is_all(x, FUN, ...)

is_all_null(x)

is_all_na(x)

Arguments

x

A list or vector passed to X parameter of vapply().

FUN

the function to be applied to each element of X: see ‘Details’. In the case of functions like +, %*%, the function name must be backquoted or quoted.

...

Arguments passed on to base::vapply

USE.NAMES

logical; if TRUE and if X is character, use X as names for the result unless it had names already. Since this argument follows ... its name cannot be abbreviated.

FUN.VALUE

a (generalized) vector; a template for the return value from FUN. See ‘Details’.

Value

TRUE if FUN returns TRUE for all elements of x or FALSE if any element returns FALSE.

See also

is_any()