Crate itermap

Tools for Iterators over maps (HashMap, BTreeMap, etc), or any two-element tuple.

Just import IterMap to get extra methods on iterators.

Examples

Mapping keys:

use itermap::IterMap;

let mut hash: HashMap<&str, &str> = HashMap::new();
hash.insert("a", "A");
hash.insert("b", "B");

let hash: HashMap<String, &str> = hash
    .into_iter()
    .map_keys(String::from)
    .collect();

Mapping values:

use itermap::IterMap;

let mut hash: HashMap<&str, &str> = HashMap::new();
hash.insert("a", "A");
hash.insert("b", "B");

let hash: HashMap<&str, String> = hash
    .into_iter()
    .map_values(String::from)
    .collect();

You can, of course, chain both adaptors to map both keys and values:

use itermap::IterMap;

let mut hash: HashMap<&str, &str> = HashMap::new();
hash.insert("a", "A");
hash.insert("b", "B");

let hash: HashMap<String, char> = hash
    .into_iter()
    .map_keys(String::from)
    .map_values(|v| v.parse().unwrap())
    .collect();

It works with any iterator over a two-element tuple:

use itermap::IterMap;

let mut values: Vec<(&str, &str)> = Vec::new();
values.push(("a", "A"));
values.push(("b", "B"));

let values: Vec<(String, char)> = values
    .into_iter()
    .map_keys(String::from)
    .map_values(|v| v.parse().unwrap())
    .collect();

Structs

MapKeys

Maps keys (or the first element of a two-element tuple like (K, V)), leaving other elements intact and untouched.

MapValues

Maps values (or the second element of a two-element tuple like (K, V)), leaving other elements intact and untouched.

Traits

IterMap

Adds additional methods for Iterators over maps (e.g., HashMap, BTreeMap, etc.) and other two-element tuples (like (K, V)).