rustHow to convert the keys of a Rust HashMap to a vector?

To convert the keys of a Rust HashMap to a vector, you can use the keys() method. This will return an iterator over the keys of the HashMap. You can then use the collect() method to convert the iterator into a vector.

Example code

use std::collections::HashMap;

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

let keys: Vec<&str> = map.keys().collect();

println!("{:?}", keys);

Output example

["a", "b", "c"]

Code explanation

• let mut map = HashMap::new();: This creates a new empty HashMap.
• map.insert("a", 1);: This inserts a key-value pair into the HashMap.
• let keys: Vec<&str> = map.keys().collect();: This uses the keys() method to get an iterator over the keys of the HashMap, and then uses the collect() method to convert the iterator into a vector.
• println!("{:?}", keys);: This prints the vector of keys.

Helpful links

• Rust HashMap documentation
• Rust Iterator documentation

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