CODEWITHSUNDEEP
javascriptecmascript-6
vardius
vardius

Reputation: 6546

What is a difference between inherits and extends of classes?

I was looking for the asnwer long time and i get it a bit complicated. What is a difference between inherits and extends of classes ?

My question was born after reading this ebook and i was using extends syntax so it maked me wonder.

Extends Classes

class A {
    a = 2;

    constructor(x) {
        this.a = x;
    }
}

class B extends A {
}

Class Inheritance

class A {
    a = 4;

    A(x) {
        a = x;
    }

    drive() {
        output( "A" )
    }
}
class B inherits A {
    drive() {
        inherited:drive()
        output( "B" )
    }
}

Can i use constructor when inherits classes ? or name constructor when extend classes ?

What is the differenc when using super or inherited ?

Can i use inherited syntax when extending class ? I read that super is a direct way for the constructor of a child class to reference the constructor of its parent class.

Upvotes: 2

Views: 4564

Answers (2)

Rameshkumar Nagapuri US
Rameshkumar Nagapuri US

Reputation: 211

Inheriting refers to the relationship between a derived class (the child) and the base class (the parent). The derived class can use certain methods and fields within the base class according to accessibility levels

Extending is interchangeable with Inheriting and usually is used in java (since the syntax for inheritance in java is the keyword extends. In C#, it is colon :

Upvotes: 0

Bergi
Bergi

Reputation: 664599

inherits is not a keyword in ES6. In that place of a class declaration, only extends is valid, you've got a syntax error.

And neither are a = 4; in a class body nor inherited:drive(). The book section you found this in even explicitly states "Consider this loose pseudo-code (invented syntax) for inherited classes".

Upvotes: 7

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