rustHow to filter a Rust HashMap?

Filtering a Rust HashMap can be done using the filter method. This method takes a closure as an argument and returns a new HashMap with only the elements that satisfy the closure.

Example code

let mut map = HashMap::new();
map.insert("a", 1);
map.insert("b", 2);
map.insert("c", 3);

let filtered_map = map.filter(|&(_, v)| v > 1);

Output example

{"b": 2, "c": 3}

Code explanation

• let mut map = HashMap::new();: creates a new empty HashMap
• map.insert("a", 1);: inserts a key-value pair into the HashMap
• map.insert("b", 2);: inserts a key-value pair into the HashMap
• map.insert("c", 3);: inserts a key-value pair into the HashMap
• let filtered_map = map.filter(|&(_, v)| v > 1);: filters the HashMap using the filter method, which takes a closure as an argument and returns a new HashMap with only the elements that satisfy the closure

Helpful links

• Rust HashMap Documentation

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