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 thekeys()
method to get an iterator over the keys of the HashMap, and then uses thecollect()
method to convert the iterator into a vector.println!("{:?}", keys);
: This prints the vector of keys.
Helpful links
Related
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- How to insert an element into a Rust HashMap if it does not already exist?
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- How to create a Rust HashMap with a string key?
- How to create a new Rust HashMap with values?
- How to create a HashMap of pointers in Rust?
- How to create a nested HashMap in Rust?
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