rustHow to implement PartialEq for a Rust HashMap?

To implement PartialEq for a Rust HashMap, you can use the eq method provided by the HashMap type. This method takes two HashMaps as arguments and returns true if they contain the same key-value pairs.

Example code

use std::collections::HashMap;

let mut map1 = HashMap::new();
map1.insert("a", 1);
map1.insert("b", 2);

let mut map2 = HashMap::new();
map2.insert("a", 1);
map2.insert("b", 2);

assert!(map1.eq(&map2));

Output example

assertion successful

Code explanation

1. use std::collections::HashMap;: imports the HashMap type from the std::collections module.

2. let mut map1 = HashMap::new();: creates a new HashMap called map1.

3. map1.insert("a", 1);: inserts a key-value pair into map1, with the key being "a" and the value being 1.

4. let mut map2 = HashMap::new();: creates a new HashMap called map2.

5. map2.insert("a", 1);: inserts a key-value pair into map2, with the key being "a" and the value being 1.

6. assert!(map1.eq(&map2));: uses the eq method to compare map1 and map2 and returns true if they contain the same key-value pairs.

Helpful links

• Rust Documentation - HashMap

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