rustHow to remove an element from a Rust HashMap if a condition is met?

Removing an element from a Rust HashMap if a condition is met can be done using the remove_entry method. This method takes a closure as an argument, which is used to determine if the element should be removed.

Example code

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

map.remove_entry(|key, value| *value == 2);

Output example

()

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.remove_entry(|key, value| *value == 2);: removes an entry from the HashMap if the closure returns true

Helpful links

• Rust HashMap documentation

Edit this code on GitHub