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
let mut map = HashMap::new();
- This creates a new empty HashMap.map.insert("a", 1);
- This inserts a key-value pair into the HashMap.map.keys()
- This returns an iterator of the keys in the HashMap.collect()
- This method is used to convert the iterator into a HashSet.
Helpful links
Related
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- How to convert a Rust HashMap to a JSON string?
- How to create a HashMap of traits in Rust?
- How to compare two Rust HashMaps?
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- How to create a HashMap of structs in Rust?
- How to join two Rust HashMaps?
- How to check if a Rust HashMap contains a key?
- How to build a Rust HashMap from an iterator?
- How to lock a Rust HashMap?
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See more codes...