d4ins

function configureEvent(config) {
    let createEvent;

    switch (config.os) {
        case 'ios':
            createEvent = createAppleEvent;
            break;
        case 'chromeos':
            createEvent = createGoogleEvent;
            break;

d4ins

function application(createEvent) {
    createEvent({name: 'Abstract Factory Pattern', date: new Date(), participants: []});
}

d4ins

function createOutlookEvent({name, date, participants}) {
    MicrosoftAPI.createEvent({title: name, date, users: participants});
}

d4ins

function createAppleEvent({name, date, participants}) {
    AppleAPI.createEvent({name, date, participants});
}

d4ins

function createGoogleEvent({name, date, participants}) {
    GoogleAPI.createEvent({title: name, date, invitees: participants});
}

d4ins

export interface CreateEventArgs {
    name: string;
    date: Date;
    participants: string[];
}

export interface Calendar {
    createEvent: (options: CreateEventArgs) => void;
}

d4ins

class GoogleCalendar implements Calendar {
    public createEvent({name, date, participants}: CreateEventArgs): void {
        GoogleAPI.createEvent({title: name, date, invitees: participants});
    }
}

d4ins

class AppleCalendar implements Calendar {
    public createEvent({name, date, participants}: CreateEventArgs): void {
        AppleAPI.createEvent({name, date, participants});
    }
}

d4ins

class OutlookCalendar implements Calendar {
    public createEvent({name, date, participants}: CreateEventArgs): void {
        MicrosoftAPI.createEvent({title: name, date, users: participants});
    }
}

d4ins

class Application {
    calendar: Calendar;

    constructor(calendar: Calendar) {
        this.calendar = calendar;
    }

    run(): void {
        this.calendar.createEvent({name: 'Abstract Factory Pattern', date: new Date(), participants: []});
    }