About

alpha-counter is a library providing the [AlphaCounter] iterator representing an alphabetic counter as would be used for numbering appendices.

It provides convenience methods to create [upper][AlphaCounter::upper] and [lower][AlphaCounter::lower] ASCII alphabets as well as any alphabet via the [custom][AlphaCounter::custom] method. All three constructors enable starting the iterator at any point; although one could also manipulate it via regular Iterator methods.

Example

``` use alpha_counter::AlphaCounter;

assert_eq!( AlphaCounter::lower(0).take(30).collect::>(), vec![ "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "aa", "ab", "ac", "ad", ], );

assert_eq!( AlphaCounter::upper(0).take(30).collect::>(), vec![ "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "AA", "AB", "AC", "AD", ], );

assert_eq!( AlphaCounter::custom(0, "abc") .take(30) .collect::>(), vec![ "a", "b", "c", "aa", "ab", "ac", "ba", "bb", "bc", "ca", "cb", "cc", "aaa", "aab", "aac", "aba", "abb", "abc", "aca", "acb", "acc", "baa", "bab", "bac", "bba", "bbb", "bbc", "bca", "bcb", "bcc", ], ); ```