Function malachite_base::num::conversion::string::from_string::digit_from_display_byte

pub const fn digit_from_display_byte(b: u8) -> Option<u8>

Produces a digit from a byte corresponding to a numeric or alphabetic (lower- or uppercase) char that represents the digit.

Bytes corresponding to chars from ‘0’ to ‘9’ become digits 0 to 9. Bytes corresponding to chars from ‘a’ to ‘z’ become digits 10 to 35. Bytes corresponding to chars from ‘A’ to ‘Z’ also become digits 10 to 35. Passing a byte that does not correspond to any of these chars yields None.

Worst-case complexity

Constant time and additional memory.

Examples

use malachite_base::num::conversion::string::from_string::digit_from_display_byte;

assert_eq!(digit_from_display_byte(b'0'), Some(0));
assert_eq!(digit_from_display_byte(b'9'), Some(9));
assert_eq!(digit_from_display_byte(b'a'), Some(10));
assert_eq!(digit_from_display_byte(b'z'), Some(35));
assert_eq!(digit_from_display_byte(b'A'), Some(10));
assert_eq!(digit_from_display_byte(b'Z'), Some(35));
assert_eq!(digit_from_display_byte(b' '), None);
assert_eq!(digit_from_display_byte(b'!'), None);