List.ascii_printable-question-mark

You're seeing just the function ascii_printable-question-mark, go back to List module for more information.

ascii_printable?(list, limit \\ :infinity)

(since 1.6.0)

Specs

ascii_printable?(list(), 0) :: true

ascii_printable?([], limit) :: true when limit: :infinity | pos_integer()

ascii_printable?([...], limit) :: boolean()
when limit: :infinity | pos_integer()

Checks if list is a charlist made only of printable ASCII characters.

Takes an optional limit as a second argument. ascii_printable?/2 only checks the printability of the list up to the limit.

A printable charlist in Elixir contains only the printable characters in the standard seven-bit ASCII character encoding, which are characters ranging from 32 to 126 in decimal notation, plus the following control characters:

?\a - Bell
?\b - Backspace
?\t - Horizontal tab
?\n - Line feed
?\v - Vertical tab
?\f - Form feed
?\r - Carriage return
?\e - Escape

For more information read the Character groups section in the Wikipedia article of the ASCII standard.

Examples

iex> List.ascii_printable?('abc')
true

iex> List.ascii_printable?('abc' ++ [0])
false

iex> List.ascii_printable?('abc' ++ [0], 2)
true

Improper lists are not printable, even if made only of ASCII characters:

iex> List.ascii_printable?('abc' ++ ?d)
false