In the dynamic field of software development, maintaining clean, efficient, and scalable code is crucial. Design patterns are invaluable tools that help developers achieve these goals by providing time-tested solutions to common programming challenges. They serve as blueprints that streamline the development process, making code easier to understand, maintain, and extend.
As a versatile and widely used language, JavaScript greatly benefits from applying design patterns. Whether you’re working on a simple script or a complex application, employing design patterns can enhance your code’s structure and reliability. This blog aims to introduce you to the fundamental design patterns in JavaScript, offering practical examples and insights on how to implement them effectively in your projects.
We’ll cover a range of design patterns, including Singleton, Factory, and Observer, discussing their advantages and appropriate use cases. By the end of this blog series, you’ll be equipped with the knowledge to apply these patterns confidently, improving your JavaScript programming skills and project outcomes. Let’s dive into the world of design patterns and discover how they can transform your approach to coding in JavaScript.
The Singleton design pattern is one of software development’s simplest yet most effective patterns. Its primary purpose is to ensure that a class has only one instance and to provide a global point of access to that instance. This can be particularly useful in situations where a single object is needed to coordinate actions across a system.
Related read: Flutter Singletons: What to do Instead and How to Avoid Them
In JavaScript, the Singleton pattern can be implemented in various ways, but the core idea remains the same: control the instantiation process so that only one instance of a class is created. Here’s a simple example to illustrate this concept:
class Counter {
counter = 0
incrementCount = () => {
this.counter++
}
decrementCount = () => {
this.counter--
}
}
//Created self invoking function and returned single instance
const singleTon = (function () {
let instance;
return {
getInstance() {
if (!instance) {
instance = new Counter
}
return instance
}
}
}())
const obj1 = singleTon.getInstance()
const obj2 = singleTon.getInstance()
obj1.incrementCount()
obj1.incrementCount()
obj2.incrementCount()
obj2.incrementCount()
console.log(obj1.counter)In the example above, I’ve constructed a class named Counter with a self-invoking method that either produces a new instance of the class and returns it, or returns an instance that already exists.
The Factory method pattern offers an object creation interface that allows for post-formation modification. The neat thing about this is that it simplifies and better organizes our code because all of the logic for constructing our objects is in one location.
There are two methods to implement this pattern, which is quite common: either using classes or factory functions (functions that return an object).
function carFactory(color, type, tyreSize) {
return {
color,
type,
tyreSize,
CC: function () {
return Math.floor(Math.random() * 1000)
}
}
}
const car1 = carFactory('red', 'petrol', '17')
const car2 = carFactory('white', 'hybrid', '19')In the example above, I have used the constructor function to generate my object and I have arguments to modify my object. In this way object creation is centralized.
The Observer design pattern is a behavioral pattern that allows an object, called the subject, to maintain a list of dependents, called observers, that are notified automatically of any state changes. This pattern is beneficial in scenarios where changes in one object must be reflected across multiple dependent objects without tightly coupling them.
Let’s understand it with a diagram:
Here we have an observable class that consists of an observers list and two methods to notify and subscribe.
Example Code:
class Observable {
constructor() {
this.observers = []
}
subscribe(fn) {
this.observers.push(fn)
}
unSubscribe(fn) {
this.observers = this.observers.filter(f => f !== fn)
}
notify(data) {
this.observers.forEach((fn) => {
fn(data)
})
}
}
const ob = new Observable()
const cb = (data) => {
console.log("Subscribed", data)
}
ob.subscribe(cb)
ob.notify("Hello")
console.log(ob.observers)
ob.unSubscribe(cb)
console.log(ob.observers)Remember that these patterns are not rigid rules but flexible guidelines that can be adapted to your specific project needs. By combining these patterns with your understanding of JavaScript, you can elevate your coding skills and create high-quality software.
In this blog post, we’ve explored the fundamental design patterns in JavaScript, including the Singleton, Factory, and Observer patterns. These patterns provide valuable tools for enhancing code structure, maintainability, and scalability. By understanding and applying these patterns effectively, you can create more robust and efficient JavaScript applications.
A Deep Dive into Modern Clinical Workflows with AI Agents & CDS Hooks
Register Now
The team at Mindbowser was highly professional, patient, and collaborative throughout our engagement. They struck the right balance between offering guidance and taking direction, which made the development process smooth. Although our project wasn’t related to healthcare, we clearly benefited...
Founder, Texas Ranch Security
Mindbowser played a crucial role in helping us bring everything together into a unified, cohesive product. Their commitment to industry-standard coding practices made an enormous difference, allowing developers to seamlessly transition in and out of the project without any confusion....
CEO, MarketsAI
I'm thrilled to be partnering with Mindbowser on our journey with TravelRite. The collaboration has been exceptional, and I’m truly grateful for the dedication and expertise the team has brought to the development process. Their commitment to our mission is...
Founder & CEO, TravelRite
The Mindbowser team's professionalism consistently impressed me. Their commitment to quality shone through in every aspect of the project. They truly went the extra mile, ensuring they understood our needs perfectly and were always willing to invest the time to...
CTO, New Day Therapeutics
I collaborated with Mindbowser for several years on a complex SaaS platform project. They took over a partially completed project and successfully transformed it into a fully functional and robust platform. Throughout the entire process, the quality of their work...
President, E.B. Carlson
Mindbowser and team are professional, talented and very responsive. They got us through a challenging situation with our IOT product successfully. They will be our go to dev team going forward.
Founder, Cascada
Amazing team to work with. Very responsive and very skilled in both front and backend engineering. Looking forward to our next project together.
Co-Founder, Emerge
The team is great to work with. Very professional, on task, and efficient.
Founder, PeriopMD
I can not express enough how pleased we are with the whole team. From the first call and meeting, they took our vision and ran with it. Communication was easy and everyone was flexible to our schedule. I’m excited to...
Founder, Seeke
We had very close go live timeline and Mindbowser team got us live a month before.
CEO, BuyNow WorldWide
If you want a team of great developers, I recommend them for the next project.
Founder, Teach Reach
Mindbowser built both iOS and Android apps for Mindworks, that have stood the test of time. 5 years later they still function quite beautifully. Their team always met their objectives and I'm very happy with the end result. Thank you!
Founder, Mindworks
Mindbowser has delivered a much better quality product than our previous tech vendors. Our product is stable and passed Well Architected Framework Review from AWS.
CEO, PurpleAnt
I am happy to share that we got USD 10k in cloud credits courtesy of our friends at Mindbowser. Thank you Pravin and Ayush, this means a lot to us.
CTO, Shortlist
Mindbowser is one of the reasons that our app is successful. These guys have been a great team.
Founder & CEO, MangoMirror
Kudos for all your hard work and diligence on the Telehealth platform project. You made it possible.
CEO, ThriveHealth
Mindbowser helped us build an awesome iOS app to bring balance to people’s lives.
CEO, SMILINGMIND
They were a very responsive team! Extremely easy to communicate and work with!
Founder & CEO, TotTech
We’ve had very little-to-no hiccups at all—it’s been a really pleasurable experience.
Co-Founder, TEAM8s
Mindbowser was very helpful with explaining the development process and started quickly on the project.
Executive Director of Product Development, Innovation Lab
The greatest benefit we got from Mindbowser is the expertise. Their team has developed apps in all different industries with all types of social proofs.
Co-Founder, Vesica
Mindbowser is professional, efficient and thorough.
Consultant, XPRIZE
Very committed, they create beautiful apps and are very benevolent. They have brilliant Ideas.
Founder, S.T.A.R.S of Wellness
Mindbowser was great; they listened to us a lot and helped us hone in on the actual idea of the app. They had put together fantastic wireframes for us.
Co-Founder, Flat Earth
Ayush was responsive and paired me with the best team member possible, to complete my complex vision and project. Could not be happier.
Founder, Child Life On Call
The team from Mindbowser stayed on task, asked the right questions, and completed the required tasks in a timely fashion! Strong work team!
CEO, SDOH2Health LLC
Mindbowser was easy to work with and hit the ground running, immediately feeling like part of our team.
CEO, Stealth Startup
Mindbowser was an excellent partner in developing my fitness app. They were patient, attentive, & understood my business needs. The end product exceeded my expectations. Thrilled to share it globally.
Owner, Phalanx
Mindbowser's expertise in tech, process & mobile development made them our choice for our app. The team was dedicated to the process & delivered high-quality features on time. They also gave valuable industry advice. Highly recommend them for app development...
Co-Founder, Fox&Fork
