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Refactor factorial function using custom iterator

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Rock070 2024-01-11 23:22:52 +08:00
parent 77c6ac4868
commit eb99e60ed8
1 changed files with 8 additions and 5 deletions
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13
exercises/18_iterators/iterators5.rs
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@ -11,8 +11,6 @@
// Execute `rustlings hint iterators5` or use the `hint` watch subcommand for a // Execute `rustlings hint iterators5` or use the `hint` watch subcommand for a
// hint. // hint.
// I AM NOT DONE
use std::collections::HashMap; use std::collections::HashMap;
#[derive(Clone, Copy, PartialEq, Eq)] #[derive(Clone, Copy, PartialEq, Eq)]
@ -35,11 +33,11 @@ fn count_for(map: &HashMap<String, Progress>, value: Progress) -> usize {
fn count_iterator(map: &HashMap<String, Progress>, value: Progress) -> usize { fn count_iterator(map: &HashMap<String, Progress>, value: Progress) -> usize {
// map is a hashmap with String keys and Progress values. // map is a hashmap with String keys and Progress values.
// map = { "variables1": Complete, "from_str": None, ... } // map = { "variables1": Complete, "from_str": None, ... }
todo!(); map.values().filter(|&val| val == &value).count()
} }
fn count_collection_for(collection: &[HashMap<String, Progress>], value: Progress) -> usize { fn count_collection_for(collection: &[HashMap<String, Progress>], value: Progress) -> usize {
let mut count = 0; let mut count: usize = 0;
for map in collection { for map in collection {
for val in map.values() { for val in map.values() {
if val == &value { if val == &value {
@ -54,7 +52,12 @@ fn count_collection_iterator(collection: &[HashMap<String, Progress>], value: Pr
// collection is a slice of hashmaps. // collection is a slice of hashmaps.
// collection = [{ "variables1": Complete, "from_str": None, ... }, // collection = [{ "variables1": Complete, "from_str": None, ... },
// { "variables2": Complete, ... }, ... ] // { "variables2": Complete, ... }, ... ]
todo!(); let mut count = 0;
collection.iter().for_each(|f| {
count += count_iterator(f, value)
});
count
} }
#[cfg(test)] #[cfg(test)]