Sha256: 26ced5160823445c46d7f8d0e6fbb035ebc73c9812913b50f417ad521842a330
Contents?: true
Size: 1.13 KB
Versions: 289
Compression:
Stored size: 1.13 KB
Contents
pub trait Luhn {
fn valid_luhn(&self) -> bool;
}
impl Luhn for String {
fn valid_luhn(&self) -> bool {
if self.chars().any(|c| c.is_alphabetic()) || self.chars().count() == 1 {
return false;
}
self.chars()
.filter_map(|c| c.to_digit(10))
.rev()
.enumerate()
.map(|(index, digit)| if index % 2 == 0 { digit } else { digit * 2 })
.map(|digit| if digit > 9 { digit - 9 } else { digit })
.sum::<u32>() % 10 == 0
}
}
impl<'a> Luhn for &'a str {
fn valid_luhn(&self) -> bool {
String::from(*self).valid_luhn()
}
}
impl Luhn for u8 {
fn valid_luhn(&self) -> bool {
self.to_string().valid_luhn()
}
}
impl Luhn for u16 {
fn valid_luhn(&self) -> bool {
self.to_string().valid_luhn()
}
}
impl Luhn for u32 {
fn valid_luhn(&self) -> bool {
self.to_string().valid_luhn()
}
}
impl Luhn for u64 {
fn valid_luhn(&self) -> bool {
self.to_string().valid_luhn()
}
}
impl Luhn for usize {
fn valid_luhn(&self) -> bool {
self.to_string().valid_luhn()
}
}
Version data entries
289 entries across 289 versions & 1 rubygems