Creational design patterns in object-oriented programming are design patterns that are to be applied during the instantiation of objects. In this chapter, we'll be talking about patterns in this category.
Consider we are building a rocket, which has payload and one or more stages:
class Payload {
weight: number;
}
class Engine {
thrust: number;
}
class Stage {
engines: Engine[];
}
In old-fashioned JavaScript, there are two major approaches to building such a rocket:
Constructor with
newoperatorFactory function
For the first approach, things could be like this:
function Rocket() {
this.payload = {
name: 'cargo ship'
};
this.stages = [
{
engines: [
// ...
]
}
];
}
var rocket = new Rocket();
And for the second approach, it could be like this:
function buildRocket...