【JavaScript】クラスの継承（extends） - 別クラスの定義を引き継ぐクラス（スーパークラス・サブクラス）

class サブクラス名 extends スーパークラス名 {
    // 定義...
}

class Person {
    
    name;
    
    constructor( name ) {
        this.name = name;
    }
    
    greeting() {
        console.log("Hello");
        console.log("My name is " + this.name);
    }
    
}

___ih_hl_start
class Teacher extends Person {
___ih_hl_end
    
}

let t = new Teacher("TANAKA");

t.greeting();

Hello
My name is TANAKA

class Person {
    
    name;
    
    constructor( name ) {
        this.name = name;
    }
    
    greeting() {
        console.log("Hello");
        console.log("My name is " + this.name);
    }
    
}

class Teacher extends Person {
    
    ___ih_diff_start
+    subject;
    ___ih_diff_end
    
    ___ih_diff_start
+    lesson() {
+        console.log(this.subject + ' : ' + this.name);
+    }
    ___ih_diff_end
    
}

let t = new Teacher("TANAKA");

___ih_diff_start
+t.subject = "Programming";
___ih_diff_end

___ih_diff_start
-t.greeting();
+t.lesson();
___ih_diff_end

Name : tanaka
Lesson : Programming