Expand description
Transform nested container types in Rust.
The crate provides the .transpose() and .flatten() on nested container types.
.transpose() exchanges the inner and outer containers types. For example,
Vec<Vec<T>>->Option<Vec<Vec<T>>>Vec<HashMap<K, V>>->Option<HashMap<K, Vec<V>>>HashMap<K, Vec<V>>->HashMap<K, Vec<V>>Result<Result<T, E>, F>->Result<Result<T, F>, E>Option<Option<T>>->Option<Option<T>>
.flatten() merges the inner and outer container types. For example,
Vec<Vec<T>>->Vec<T>HashMap<K, HashMap<L, V>>->HashMap<(K, L), V>HashMap<K, Vec<V>>->HashMap<(K, usize), V>Vec<HashMap<K, V>>->HashMap<(usize, K), V>
This is an example usage of .transpose and .flatten().
use mona::prelude::*;
let vec_of_vec = vec![vec![1, 2, 3], vec![4, 5, 6]];
assert_eq!(
vec_of_vec.clone().transpose(),
Some(vec![vec![1, 4], vec![2, 5], vec![3, 6]])
);
assert_eq!(vec_of_vec.flatten(), vec![1, 2, 3, 4, 5, 6]);