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use std::collections::HashMap;
/// Represents a key-value pair entry in a map.
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct Entry<K, V> {
/// The key of the entry.
pub key: K,
/// The value of the entry.
pub value: V,
}
/// Collects all entries from a map into a vector of `Entry` structs.
///
/// Iterates over each key-value pair in the input map and collects them into a vector.
///
/// # Arguments
/// * `map` - The input map from which to collect entries.
///
/// # Returns
/// * `Vec<Entry<K, V>>` - A vector containing all key-value pairs as `Entry` structs.
///
/// # Examples
/// ```rust
/// use lowdash::{Entry, entries};
/// use std::collections::HashMap;
///
/// let mut map = HashMap::new();
/// map.insert("a", 1);
/// map.insert("b", 2);
///
/// let result = entries(&map);
/// let expected = vec![
/// Entry { key: "a", value: 1 },
/// Entry { key: "b", value: 2 },
/// ];
///
/// let mut sorted_result = result.clone();
/// sorted_result.sort_by(|a, b| a.key.cmp(&b.key));
///
/// let mut sorted_expected = expected.clone();
/// sorted_expected.sort_by(|a, b| a.key.cmp(&b.key));
///
/// assert_eq!(sorted_result, sorted_expected);
/// ```
pub fn entries<K, V>(map: &HashMap<K, V>) -> Vec<Entry<K, V>>
where
K: Clone + std::cmp::Eq + std::hash::Hash,
V: Clone,
{
map.iter()
.map(|(k, v)| Entry {
key: k.clone(),
value: v.clone(),
})
.collect()
}
#[cfg(test)]
mod tests {
use super::*;
use std::collections::HashMap;
#[test]
fn test_entries_single_entry() {
let mut map = HashMap::new();
map.insert("a", 1);
let result = entries(&map);
let expected = vec![Entry { key: "a", value: 1 }];
assert_eq!(result, expected);
}
#[test]
fn test_entries_multiple_entries() {
let mut map = HashMap::new();
map.insert("a", 1);
map.insert("b", 2);
map.insert("c", 3);
let result = entries(&map);
let expected = vec![
Entry { key: "a", value: 1 },
Entry { key: "b", value: 2 },
Entry { key: "c", value: 3 },
];
// Since HashMap does not guarantee order, we need to sort both vectors before comparison
let mut sorted_result = result.clone();
sorted_result.sort_by(|a, b| a.key.cmp(&b.key));
let mut sorted_expected = expected.clone();
sorted_expected.sort_by(|a, b| a.key.cmp(&b.key));
assert_eq!(sorted_result, sorted_expected);
}
#[test]
fn test_entries_empty_map() {
let map: HashMap<&str, i32> = HashMap::new();
let result = entries(&map);
let expected: Vec<Entry<&str, i32>> = vec![];
assert_eq!(result, expected);
}
#[test]
fn test_entries_with_integers() {
let mut map = HashMap::new();
map.insert(1, "one");
map.insert(2, "two");
let result = entries(&map);
let expected = vec![
Entry {
key: 1,
value: "one",
},
Entry {
key: 2,
value: "two",
},
];
// Sort for comparison
let mut sorted_result = result.clone();
sorted_result.sort_by(|a, b| a.key.cmp(&b.key));
let mut sorted_expected = expected.clone();
sorted_expected.sort_by(|a, b| a.key.cmp(&b.key));
assert_eq!(sorted_result, sorted_expected);
}
#[test]
fn test_entries_with_complex_values() {
let mut map = HashMap::new();
map.insert("a", vec![1, 2, 3]);
map.insert("b", vec![4, 5]);
map.insert("c", vec![6]);
let result = entries(&map);
let expected = vec![
Entry {
key: "a",
value: vec![1, 2, 3],
},
Entry {
key: "b",
value: vec![4, 5],
},
Entry {
key: "c",
value: vec![6],
},
];
// Since HashMap does not guarantee order, sort before comparison
let mut sorted_result = result.clone();
sorted_result.sort_by(|a, b| a.key.cmp(&b.key));
let mut sorted_expected = expected.clone();
sorted_expected.sort_by(|a, b| a.key.cmp(&b.key));
assert_eq!(sorted_result, sorted_expected);
}
}