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how to inherit Constructor from super class to sub class


how to inherit Constructor from super class to sub class

By : Raja Zahid Hussain K
Date : October 25 2020, 12:12 PM
it fixes the issue Constructors are not inherited, you must create a new, identically prototyped constructor in the subclass that maps to its matching constructor in the superclass.
Here is an example of how this works:
code :


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Inherit and use super class's constructor in javascript

Inherit and use super class's constructor in javascript


By : user2372415
Date : March 29 2020, 07:55 AM
hop of those help? I wonder if it's possible to instantiate subclasses in javascript by automatically using the super class's constructor. ,
code :
Cat.prototype.constructor = Cat;
//Otherwise instances of Cat would have a constructor of Mammal
subclass(parent) {
    function Child() {
        parent.apply(this, arguments);
    }
    Child.prototype = Object.create(parent.prototype);
    Child.prototype.constructor = Child;
    return Child;
}
function A(prop) {
    this.prop = prop;
}
A.prototype.whatAmI = function() {
    console.log(
        "I'm an instance of %s, my prop is %s",
        this instanceof A1? "A1" : "A2",
        this.prop
    );
};
var A1 = subclass(A),
    A2 = subclass(A);
Python - Inherit an Already Initialized Class Without Calling Super Constructor

Python - Inherit an Already Initialized Class Without Calling Super Constructor


By : user3232817
Date : March 29 2020, 07:55 AM
Any of those help You likely use the wrong structure : your city is not a county, your county is not a state. You should use composition instead of derivation
code :
class State(object):
  def __init__(self, **kwargs):
    self.__dict__.update(kwargs)

  def state_name(self):
    return self.state


class County(object):
  def __init__(self, state, **kwargs):
    self.state=state # this will just reference the state object
    self.__dict__.update(kwargs)
  def getStateName(self):
    return self.state.state


class City(object):
  def __init__(self, county, **kwargs):
    self.county = county
    self.__dict__.update(kwargs)
  def getStateName(self):
    return self.county.getStateName()
Why can't we call super class constructor using super keyword from child class method in Java?

Why can't we call super class constructor using super keyword from child class method in Java?


By : user3453014
Date : March 29 2020, 07:55 AM
wish help you to fix your issue In Java, each keyword has its own meaning ... for example to define a new class, we use 'class' keyword. Each keyword is reserved to do a particular thing. Basically when you type a keyword, it is an instruction to jvm and jvm knows what needs to be done on an encounter with a particular keyword. Same way super() is designed to be called with in a subclass constructor only so that when you instantiate object of subclass, super class defaults will also get instantiated. So it ensures that on instantiating a sub class instance, super class defaults will also get instantiated. Now, if you want to create a super class Object inside your method, you can use new keyword.
How can a class inherit from Object class and another explicit super class?

How can a class inherit from Object class and another explicit super class?


By : Alaoui Mohammed
Date : March 29 2020, 07:55 AM
wish of those help I know that Java doesn't support multiple inheritance. Every class in Java inherits from java.lang.Object class. In the absence of any other explicit super class, every class is implicitly a subclass of java.lang.Object class. , A extends B.
B extends C.
Javascript - how to initialize super class if super class constructor takes arguments

Javascript - how to initialize super class if super class constructor takes arguments


By : Alfred Miller
Date : March 29 2020, 07:55 AM
hope this fix your issue First of all, there's a bunch of errors in that code.
This will make IntermediateClass a sister of SuperClass.
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