beginnerCollections
HashSet Basic
Use HashSets for unique collections and set operations.
HashSet Basic
Use HashSets for unique collections and set operations.
Difficulty
Beginner
Code
rust
use std::collections::HashSet;
fn main() {
let mut a: HashSet<i32> = vec![1, 2, 3, 4].into_iter().collect();
let b: HashSet<i32> = vec![3, 4, 5, 6].into_iter().collect();
println!("union: {:?}", a.union(&b).collect::<Vec<_>>());
println!("intersection: {:?}", a.intersection(&b).collect::<Vec<_>>());
println!("difference: {:?}", a.difference(&b).collect::<Vec<_>>());
a.insert(5);
println!("a contains 5: {}", a.contains(&5));
}Explanation
HashSet stores unique values with set operations.
Key Concepts
- Read the code carefully and understand the data flow
- Try modifying the example to see how it changes behavior
- Run this code in the Rust Playground
Related Topics
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