What is the process for inheriting in JavaScript while also defining new prototype members as a singular object?

I find this code repetitive because it repeatedly uses Child.prototype:

function Parent(a)
{
  this.a = a;
}

function Child(a, b)
{
  Parent.call(this, a);
  this.b = b;
}

Child.prototype = Object.create(Parent.prototype);

Child.prototype.constructor = Child;
Child.prototype.childValue = 456;
Child.prototype.anotherChildValue = 457;
Child.prototype.yetAnotherValue = 458;
Child.prototype.IHateToWriteChildPrototypeEachTime = 459;
// ...and so on

I prefer a more concise way to add new members like this:

{
  constructor: Child,
  childValue: 456,
  anotherChildValue: 457,
  yetAnotherValue: 458,
  ILoveThisSinceItsSoTerse: 459,
  // ...and many more
}

Is there a simpler and more efficient method to achieve this without creating additional functions or reinventing existing solutions?

Answer №1

A straightforward approach is to create a custom extend function that achieves your desired outcome:

var extendFunction = function(object, methods) {
  for(var property in methods) {
    if(methods.hasOwnProperty(property)) {
      object[property] = methods[property];
    }
  }
}

Then, simply use the function like this:

extendFunction(Child.prototype, {
  constructor: Child,
  method: function() { }
});

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