Command
Another design pattern with huge importance in Node.js is Command. In its most generic definition, we can consider a command as any object that encapsulates all the information necessary to perform an action at a later time. So, instead of invoking a method or a function directly, we create an object representing the intention to perform such an invocation; it will then be the responsibility of another component to materialize the intent, transforming it into an actual action. Traditionally, this pattern is built around four major components, as shown in the following figure:
The typical organization of the Command pattern can be described as follows:
Command: This is the object encapsulating the information necessary to invoke a method or function.
Client: This creates the Command and provides it to the Invoker.
Invoker: This is responsible for executing the Command on the Target.
Target (or Receiver): This is the subject of the invocation. It can be a lone function or the method...
