how-to-get-an-entry-from-a-hashset-in-rust.md

How to get an entry from a HashSet in Rust?

// plain

To get an entry from a HashSet in Rust, you can use the get method. This method takes a reference to the value you want to get and returns an Option<&T> where T is the type of the value stored in the HashSet.

Example code

let mut set = HashSet::new();
set.insert("foo");

let entry = set.get(&"foo");
println!("{:?}", entry);

Output example

Some("foo")

The code above creates a new HashSet and inserts a value of type &str into it. Then it uses the get method to get the entry with the value "foo". The get method returns an Option<&T> where T is the type of the value stored in the HashSet. In this case, T is &str so the return type is Option<&str>. The output of the code is Some("foo") which indicates that the entry was found in the HashSet.

Code explanation

• let mut set = HashSet::new();: creates a new HashSet
• set.insert("foo");: inserts a value of type &str into the HashSet
• let entry = set.get(&"foo");: uses the get method to get the entry with the value "foo"
• println!("{:?}", entry);: prints the result of the get method

Helpful links

• Rust HashSet documentation

group: hashset

onelinerhub: How to get an entry from a HashSet in Rust?