Defining traits
We will create a trait called GetType that we will use to get the type of a variable as a string.
To define a trait we use the trait keyword and the name of the trait, followed by the prototype of the methods we want to implement.
trait GetType {
fn get_type(&self) -> &str;
}
We will implement the get_type trait for the String type.
impl GetType for String {
fn get_type(&self) -> &str {
"String"
}
}
Now every time the get_type method will be called on a String instance, it will return the “String”.
let my_string = String::from("Hello world!");
println!("Hi, my name is my_string ! I'm a {} and my value is {}", my_string.get_type(), my_string);
Result:
Hi, my name is my_string ! I'm a String and my value is Hello world!