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Compare string in Rust

There are many different ways to compare strings in Rust:

  • Using eq / ne To Compare String and &str Values
  • Using The == And != Operators
  • Using eq_ignore_ascii_case
  • Using cmp For Sort Order

Using eq / ne To Compare String and &str Values

Below example we will be using eq() function.

fn main() {
    let fruit1: String = String::from("apple");
    let fruit2: String = String::from("banana");
    println!("{}", fruit1.eq(&fruit2));
    
    let fruit1: String = String::from("apple");
    let fruit2: String = String::from("apple");
    println!("{}", fruit1.eq(&fruit2));
}

Output

false
true


Using The == And != Operators

Below example we will be using == and != logical operators supported by Rust.

fn main() {
    let fruit1: String = String::from("apple");
    let fruit2: String = String::from("banana");
    println!("{}", fruit1 == fruit2);
    
    let fruit1: String = String::from("apple");
    let fruit2: String = String::from("apple");
    println!("{}", fruit1 == fruit2);
}

Output

false
true


Using eq_ignore_ascii_case

Use eq_ignore_ascii_case() is a function on the str type. It compares strings in Rust without regard to their cases.

fn main() {
    let fruit1: String = String::from("apple");
    println!("{}", fruit1.eq_ignore_ascii_case("banana"));
    
    let fruit1: String = String::from("apple");
    println!("{}", fruit1.eq_ignore_ascii_case("apple"));
}

Output

false
true


Using cmp For Sort Order

At some point in our codes, we want to know which string value is greater or less than another string value. To achieve that, we could use the cmp() method, which comes from the Ord trait. Consider the following example.

fn main() {
    let apple: &str = "apple";
    let banana: &str = "banana";
 
    let order1 = apple.cmp(banana);
    println!("{:?}", order1);
 
    let order2 = banana.cmp(apple);
    println!("{:?}", order2);
}

Output

Less
Greater


Conclusion

In this page (written and validated by ) you learned about Compare string in Rust . What's Next? If you are interested in completing Rust tutorial, we encourage you simply to start here: Rust Tutorial.



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