Rust:
Converting a string to lower case
How to:
fn main() {
let greeting = "HeLLo, WoRlD!";
let lowercase_greeting = greeting.to_lowercase();
println!("{}", lowercase_greeting); // "hello, world!"
}Output:
hello, world!Deep Dive
Before the .to_lowercase() method, you might have seen Rustaceans using .to_ascii_lowercase() for the same task, which only affected ASCII characters. The Rust standard library evolved, offering .to_lowercase() for full Unicode support—meaning it can handle more than just English! This matters a lot if your app steps out into the wider, multilingual world.
What’s under the hood? Well, the to_lowercase() method isn’t just swapping out ‘A’ to ‘a’. It’s more like a tiny linguist, knowledgeable in Unicode’s ways. It follows the Unicode standard to correctly lowercase characters respecting their cultural nuances.
Of course, there are alternatives. You can bust out a loop, plow through each char, and convert it yourself. But why reinvent the wheel when Rust’s standard library has put in the work?