rustHow to extend a Rust HashMap?

Extending a Rust HashMap is done by adding new key-value pairs to the existing map. This can be done using the insert() method.

use std::collections::HashMap;

let mut map = HashMap::new();

map.insert("key1", "value1");
map.insert("key2", "value2");

The code above creates a new HashMap and adds two key-value pairs to it.

• let mut map = HashMap::new(); creates a new empty HashMap.
• map.insert("key1", "value1"); adds a new key-value pair to the HashMap.

Helpful links

• Rust HashMap Documentation

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