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⭐Rust的中文翻譯以參考這份檔案為主.

目錄

• 派生屬性(Derive)
• 參數和引數的差異(Difference between parameter and argument)

派生屬性(Derive)

• 比較性質(traits): Eq, PartialEq, Ord, PartialOrd.
• Clone, 從&T 建立 &T 通過copy(見下一項)
• Copy, 給予一種型別"copy語意(copy semantics)，而非移動語意(move semantics)
• Hash, 從&T運算雜湊(compute a hash from &T)
• Default, 創建一個檔案型別的空實例(to create an empty instance of a data type)
• Debug, 安排使用{:?}格式的值(to format a value using the {:?} formatter)

Example 01 - 沒有派生屬性 Without Derive trait(s).

enum Title {
  CEO,
  CTO,
  Engineer
}
struct Employee {
  position: Title,
  work_hour: i64
}

fn main() {
    let person_a = Employee{
      position: Title::CTO,
      work_hour:25
    };
  match person_a.position {
    Title::CEO => println!("CEO"),
    Title::CTO => println!("CTO"),
    Title::Engineer => println!("Engineer"),
  }
}

/*
CTO
*/

Example 02 - Debug派生屬性

#[derive(Debug)]
enum Title {
    CEO,
    CTO,
    Engineer,
}

struct Employee {
    position: Title,
    work_hour: i64,
}

fn main() {
    let person_a = Employee {
        position: Title::CTO,
        work_hour: 25,
    };
    println!("{:?}", person_a.position);
}

/*
CTO
*/

Example 03

#[derive(Debug)]
enum Title {
    CEO,
    CTO,
    Engineer,
}

#[derive(Debug)]
struct Employee {
    position: Title,
    work_hour: i64,
}

fn main() {
    let person_a = Employee {
        position: Title::CTO,
        work_hour: 25,
    };
    println!("{:?}", person_a);
}

/*
Employee { position: CTO, work_hour: 25 }
*/

Example 04 - #[derive(Clone, Copy)]

#[derive(Debug, Clone, Copy)]
enum Title {
    CEO,
    CTO,
    Engineer,
}

#[derive(Debug, Clone, Copy)]
struct Employee {
    position: Title,
    work_hour: i64,
}

fn print_employee(emp: Employee) {
    println!("{:?}", emp);
}

fn main() {
    let person_a = Employee {
        position: Title::CTO,
        work_hour: 25,
    };
    let person_b = Employee {
        position: Title::Engineer,
        work_hour: 40,
    };
    print_employee(person_a);
    print_employee(person_b);
}

/*
Employee { position: CTO, work_hour: 25 }
Employee { position: Engineer, work_hour: 40 }
*/

參數和引數的差異(Difference between parameter and argument)

✨參數和引數的差異(Difference between parameter and argument)

• 引數 (Argument) 是用於呼叫函式，
• 參數 (Parameter) 是方法簽章 (方法的宣告)。

解釋Explanation

✨什麼是過程式程式Procedural programming

• • 過程定義了一個參數 (Parameter)，呼叫的程式碼會傳送一個引數到那個參數(The procedure defines a parameter, and the calling code passes an argument to that parameter)
• 一個引數表示當你呼叫一個procedure，並傳送到過程參數的值。當被呼叫的程式碼呼叫了procedure，會供應參數。An argument represents the value that you pass to a procedure parameter when you call the procedure. The calling code supplies the arguments when it calls the procedure.

void Foo(int i, float f)
{
    // Do things
}

void Bar()
{
    int num = 1;
    Foo(anInt, 2.0);
}

• num 與 2.0 即為 引數 (Argument)，或稱為 函式引數 (Argument of a Function)。
• i 與 f 則為 參數 (Parameter)。
  例子引用自https://notfalse.net/6/arg-vs-param

參考資料 Reference

• ⭐ Rust官網 - 繁體版本
• Must try! Rust官網 - 英文版本
• ⭐ 超讚! github.io Rust檔案 - 繁體中文
• 原始Medium系列Rust文章 - 英文版本

Nice 教學影片

• ZeroToMastery Rust課程 - 英文付費教學
• 無人不知的佛心 Youtube頻道 FreeCodeCamp - 英文免費教學
• 適合熟悉Rust語法後再看 Youtube頻道 No Boilerplate - 英文免費教學