Calling a class method from the constructor

Question

I'm getting an error when calling a class method from its constructor. Is it possible to call a method from the constructor? I tried calling the base class method from the constructor of a derived class but I am still getting an error.

'use strict';

class Base {
    constructor() {
        this.val = 10;
        init();
    }

    init() {
        console.log('this.val = ' + this.val);
    }
};

class Derived extends Base {
    constructor() {
        super();
    }
};

var d = new Derived();

➜ js_programs node class1.js /media/vi/DATA/programs/web/js/js_programs/class1.js:7 init(); ^

ReferenceError: init is not defined at Derived.Base (/media/vi/DATA/programs/web/js/js_programs/class1.js:7:9) at Derived (/media/vi/DATA/programs/web/js/js_programs/class1.js:18:14) at Object. (/media/vi/DATA/programs/web/js/js_programs/class1.js:23:9) at Module._compile (module.js:435:26) at Object.Module._extensions..js (module.js:442:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:311:12) at Function.Module.runMain (module.js:467:10) at startup (node.js:136:18) at node.js:963:3 ➜ js_programs

Maybe the title should be Calling a method from constructor or Calling a member function from constructor. A class method is a static method. — DarkTrick

deceze deceze · Accepted Answer · 2016-02-19T11:52:32

You're calling the function init(), not the method init of either Base or the current object. No such function exists in the current scope or any parent scopes. You need to refer to your object:

this.init();

Calling a class method from the constructor

2 Answers