Integer.undigits

You're seeing just the function undigits, go back to Integer module for more information.
Link to this function

undigits(digits, base \\ 10)

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Specs

undigits([integer()], pos_integer()) :: integer()

Returns the integer represented by the ordered digits.

An optional base value may be provided representing the radix for the digits. Base has to be an integer greater than or equal to 2.

Examples

iex> Integer.undigits([1, 2, 3])
123

iex> Integer.undigits([1, 4], 16)
20

iex> Integer.undigits([])
0