Methods of Structs

  • What Are Methods?

Methods are just like user-defined functions. They are like functions, but the only difference lies in the fact that methods are declared specifically within the struct context.

  • Declare a Method

The method is like a regular function except that the &self parameter is passed to it and the items within the function are accessed through it.

  self.ite

Here self is the calling instance, i.e., it is referencing to the struct.

  • Call a Method

An instance of the struct has to be created to invoke it. This is similar to invoking a struct.

Why struct method? The main advantage is that all the data related to the instance is put inside the impl block rather than putting it in different places.

Example

The example below shows declares a method name_code function within the impl construct:

  //declare a struct

struct Course {

    name: String,

    level: String,

    code:i32

}

//impl construct to define struct methods

impl Course {

    fn name_code(&self) -> String {

        format!("{} {}", self.name, self.code)

    }

}



fn main() {

    let course_1 = Course {

        name: "Rust".to_string(),

        level:"beginner".to_string(),

        code:132

    };

    //call the non-static method

    println!("This is a {} course: {}", course_1.level, course_1.name_code());

}

output

  This is a beginner course: Rust 132

Quiz

Test your understanding of methods of structs.

--- primaryColor: steelblue secondaryColor: '#e8e8e8' textColor: black shuffleQuestions: false shuffleAnswers: true locale: en --- # Which code block has the method enclosed in it? - [ ] `impl` - [ ] `fn`
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Last updated 25 Jan 2024, 05:11 +0530 . history