Rust Platform

🎯 In Python, "Hello, World!" is just a str — there's only one string type and you rarely think about it.

Rust has two main string types, and understanding the difference early will save you a lot of confusion:

• &str (string slice) — a borrowed reference to string data. Think of it like a read-only view. String literals like "hello" are &str by default.
• String (owned string) — a heap-allocated, growable string that you own and can modify. Closer to Python's str in terms of what you can do with it.

The function signature here asks you to return a String, not a &str. That means you need to convert the string literal into an owned String.

Common ways to do this:

"hello".to_string()    // calls the ToString trait
String::from("hello")  // explicit construction
"hello".into()         // uses the Into trait (type must be inferrable)

All three are equivalent — pick whichever reads best to you. You'll see .to_string() and String::from() most often in Rust codebases.

Your Task

Implement the hello_world function so it returns "Hello, World!" as an owned String.

Example

assert_eq!(hello_world(), "Hello, World!");

Further Reading

• The Rust Book — What Is Ownership? — foundational for understanding String vs &str
• The Rust Book — The String Type — deep dive into how Rust strings work under the hood