Shared logic between constructor and another function in Java Script

Question

I have a situation like that:

class TestClass {
   constructor() {
    shared logic
  }

  anotherFunction() {
    shared logic
  }
}

How can I achieve that not duplicating the code?

Huh... put the logic within anotherFunction and call it from the constructor? — Jeto
– Jeto, Commented Nov 30, 2018 at 16:33

Matus Dubrava · Accepted Answer · 2018-11-30 16:35:14Z

2

As always, create a function for the shared logic, either inside of the class or outside of it.

class TestClass {
    constructor() {
        this.sharedLogicFunction();
    }

    anotherFunction() {
        this.sharedLogicFunction();
    }

    sharedLogicFunction() {}
}

answered Nov 30, 2018 at 16:35

Matus Dubrava

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2 Comments

Gershom Maes Over a year ago

This looks exactly right! Note that the ONLY restriction here is that super must be called before this is referenced. If for some weird reason sharedLogicFunction needs to occur before a call to super, sharedLogicFunction would need to be made static or defined outside the class altogether.

Murakami Over a year ago

But isn't it like that super needs to be called in order to access parent class, ie. when child class extends parent? Then we would have access to parents methods. In the scenario above is it really necassacy to call super in order to use 'this'?

sbqq · Accepted Answer · 2018-11-30 16:34:47Z

0

Put your code to the anotherFunction() and call this function from constructor.

class TestClass {
   constructor() {
    this.anotherFunction();
  }

  anotherFunction() {
    here is some logic to do
  }
}

answered Nov 30, 2018 at 16:34

sbqq

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