gtin/internal/utils
Internal utility functions for the GTIN library. These functions are not part of the public API.
Values
pub fn last_digit(digits: List(Int)) -> IntExtract the last digit from a list of integers.
Returns the last element if the list is non-empty, otherwise returns 0.
Examples
last_digit([1, 2, 3])
// -> 3
last_digit([])
// -> 0
pub fn parse_digit(char: String) -> Result(Int, Nil)Parse a single character to an integer digit.
Returns Ok(digit) if the character is a digit (0-9), otherwise returns Error.
Examples
parse_digit("5")
// -> Ok(5)
parse_digit("a")
// -> Error(InvalidCharacters)