Crate iter_index 

This crate provides a simple extension trait that provides a more flexible alternative to the iterator’s method enumerate().

It allows to:

• use a custom type for the index with index::<T>()
• define a custom start value with index_start::<T>(start: T)
• define a custom step value with index_step::<T>(start: T, step: T).

use iter_index::IndexerIterator;

let items = vec!["a", "b", "c"];
let result = items.iter().index::<i32>().collect::<Vec<_>>();
assert_eq!(result, vec![(0_i32, &"a"), (1_i32, &"b"), (2_i32, &"c")]);

let result = items.iter().index_start::<u8>(97).collect::<Vec<_>>();
assert_eq!(result, vec![(97_u8, &"a"), (98_u8, &"b"), (99_u8, &"c")]);

let result = items.into_iter().index_step::<i16>(100, 10).collect::<Vec<_>>();
assert_eq!(result, vec![(100_i16, "a"), (110_i16, "b"), (120_i16, "c")]);

let items = 'a'..='z';
let mut result = items.index_step(100, 10);
assert_eq!(result.next(), Some((100, 'a')));
assert_eq!(result.nth(5), Some((160, 'g')));

Structs

Indexer

An iterator that yields the current count, with the generic type, and the iteration item.

Traits

IndexerIterator