Mastering JavaScript Design Patterns - Second Edition

Command

The command pattern is a method of encapsulating both the parameters to a method, as well as the current object state, and which method is to be called. In effect the command pattern packs up everything needed to call a method at a later date into a nice little package. Using this approach one can issue a command and wait until a later date to decide which piece of code will execute the command. This package can then be queued or even serialized for later execution. Having a single point of command execution also allows for easily adding functionality such as undo or command logging.

This pattern can be a bit difficult to imagine so let's break it down into its components:

Command message

The first component of the command pattern is, predictably, ...