- 01Setting up (what you'll need)
- 02Your first output (println!)
- 03Variables and mutability (let / mut)
- 04Type annotations and basic types
- 05Branching (the if statement)
- 06Repeating (the for loop)
- 07Writing your own function
- 08Repeating (while and loop)
- 09Ownership, the basics
- 10Borrowing (references, &)
- 11Working with vectors (Vec)
- 12Structs
- 13enum and the match expression
- 14The Option type (null safety)
- 15The Result type and error handling
- 16Traits
- 17Generics
- 18Closures
- 19Working with strings (String)
- 20[Project] Build a small inventory system
Working with strings (String)
This lesson covers basic string handling with the String type.
Rust has two main string types: String, which owns its data, and &str, which is used as a reference. String comes with handy methods such as len(), push_str(), and to_uppercase().
The sample code converts to upper case with message.to_uppercase() and checks the byte length with message.len().
A common early stumble is the difference between String and &str. "A string you own (and can modify) is a String; a string you have only borrowed is a &str" makes the choice easier.
In professional work, the common split is &str for function parameters, since it accepts more, and String for data you hold on to and change.
๐งช This site can't compile or run Rust directly, so it checks on the spot whether what you typed matches the reference code (scoring happens entirely in your browser โ nothing is sent anywhere).