Applications without Dependency Injection

Without the Dependency Injection framework, the life of a developer would be very tough. Take a look at the following drawbacks of not using Dependency Injection:

• Every time a constructor parameter needs to be passed, we will need to edit the constructor definition of the class in all instances

• We will need to create constructors and inject each of the required dependency classes individually

Let's take a look at an application without Dependency Injection to understand the challenges and shortfalls:

class products {
 available;
 category;
 
 constructor() {
  this.available = new warehouse();
  this.category = new category();
 }
}

Let's analyze the preceding code snippet to understand better:

1. We created a class named products.
2. In the constructor method, we instantiated the dependent classes, warehouse and category.
3. Note that...