Command.js

class Driver
{
    constructor(command)
    {
        this.command = command;
    }
    
    execute()
    {
        this.command.execute();
    }
}

class Engine
{
    constructor()
    {
        this.state = false;
    }
    
    on()
    {
        this.state = true;
    }
    
    off()
    {
        this.state = false;
    }
}

class OnStartCommand
{
    constructor(engine)
    {
        this.engine = engine;
    }
    
    execute()
    {
        this.engine.on();
    }
}

class OnSwitchOffCommand
{
    constructor(engine)
    {
        this.engine = engine;
    }
    
    execute()
    {
        this.engine.off();
    }
}

const engine = new Engine();

console.log(engine);

const onStartCommand = new OnStartCommand(engine);
const driver = new Driver(onStartCommand);
driver.execute();

console.log(engine);