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

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

Example code

use std::collections::{HashMap, HashSet};

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

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

Output example

{"a", "b", "c"}

Code explanation

1. let mut map = HashMap::new(); - This creates a new empty HashMap.
2. map.insert("a", 1); - This inserts a key-value pair into the HashMap.
3. map.keys() - This returns an iterator of the keys in the HashMap.
4. collect() - This method is used to convert the iterator into a HashSet.

Helpful links

• HashMap documentation
• HashSet documentation

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