Page 146 - JavaScript

aCommand.push(new Array() ); //array argument

Constructor for command class

class DoThis {
constructor( stringArg, numArg, objectArg, arrayArg ) {
this._stringArg = stringArg;
this._numArg = numArg;
this._objectArg = objectArg;
this._arrayArg = arrayArg;
}
Execute() {
var receiver = new Instructions();
receiver.DoThis(this._stringArg, this._numArg, this._objectArg, this._arrayArg );
}
}

Invoker

aCommand.Execute();

Can invoke:

• immediately
• in response to an event
• in a sequence of execution
• as a callback response or in a promise
• at the end of an event loop
• in any other needed way to invoke a method

Receiver

class Instructions {
DoThis( stringArg, numArg, objectArg, arrayArg ) {
console.log( `${stringArg}, ${numArg}, ${objectArg}, ${arrayArg}` );
}
}

A client generates a command, passes it to an invoker that either executes it immediately or
delays the command, and then the command acts upon a receiver. The command pattern is very
useful when used with companion patterns to create messaging patterns.

Iterator

An iterator pattern provides a simple method for selecting, sequentially, the next item in a
collection.

Fixed Collection

https://riptutorial.com/ 103