Mastering TypeScript: Learn How to Use Get and Set with These Easy Code Examples

Table of content

  1. Introduction
  2. Understanding TypeScript
  3. Getting Started with Getters and Setters
  4. Examples of Simple Getter and Setter Functions
  5. Working with Private and Protected Access Modifiers
  6. Advanced Getter and Setter Techniques
  7. Best Practices for Using Getters and Setters
  8. Conclusion


Hey there, TypeScript enthusiasts! Today, I want to talk about one of my favorite features of this amazing programming language – get and set. If you're not familiar with these nifty little methods, don't worry because I'm here to help.

Get and set are two methods that allow you to retrieve and modify properties of an object. They're incredibly useful and can make your code much more readable and maintainable. Plus, they're super easy to use once you get the hang of them.

In this article, I'll show you how to use get and set with some easy-to-follow code examples. We'll start with the basics and work our way up to more complex scenarios. By the end, you'll have a solid understanding of how amazing these methods can be.

So, whether you're a seasoned TypeScript pro or just starting out, buckle up and get ready to master get and set!

Understanding TypeScript

Have you been curious about TypeScript but don't quite know where to start? I was in the same boat not too long ago, but I'm happy to report that TypeScript is a nifty language that's not as daunting as it may seem.

One of the first things I learned about TypeScript is that it's a superset of JavaScript, meaning that any valid JavaScript code is also valid TypeScript code. How amazing is that? It also means that you can easily integrate TypeScript into existing JavaScript projects without having to start from scratch.

One of the key benefits of using TypeScript is the ability to catch errors earlier on in the development process. TypeScript utilizes static typing, meaning that you declare the type of a variable when it's created. This helps avoid any unintended consequences of using the wrong data type, which can often go undetected in regular JavaScript until runtime.

Another interesting feature of TypeScript is the use of getters and setters. These allow you to control access to properties of an object, essentially giving you complete control over how the code interacts with that object. This can be especially useful if you're building a class that needs to adhere to certain rules or constraints.

Overall, I've found TypeScript to be a powerful and handy tool for creating more efficient and error-free code. If you're looking to improve your JavaScript skills, I highly recommend giving TypeScript a try.

Getting Started with Getters and Setters

So, you want to learn how to use getters and setters in TypeScript? Well, let me tell you, they are nifty little features that can make your code much cleaner and easier to work with.

First things first, let's start with the basics. Getters and setters are used to access and manipulate the values of private variables within a class. This means that you can control how variables are accessed and modified, rather than just letting anyone change them willy-nilly.

To create a getter, you simply add the keyword get followed by the name of the variable you want to access. For example:

class Person {
  private _name: string;
  get name() {
    return this._name;

In this example, we have a private variable called _name. By adding a getter for the name variable, we can access it outside of the class without directly exposing the private variable.

To create a setter, you use the keyword set followed by the variable name and a parameter for the new value. Here's an example:

class Person {
  private _age: number;
  get age() {
    return this._age;
  set age(newAge: number) {
    if(newAge >= 0) {
      this._age = newAge;

In this example, we have a private variable called _age. By adding a setter for the age variable, we can control how it is modified. In this case, we are checking to make sure that the new age is not negative before allowing it to be set.

So, there you have it! in TypeScript is pretty easy once you know the basics. And just think, once you master these features, you'll be able to control your code like a boss. How amazing would that be?

Examples of Simple Getter and Setter Functions

Let me tell you about some nifty that I've come across while mastering TypeScript! If you're not familiar with the concept, getters and setters are functions that allow you to access and modify properties of an object. They're like little gatekeepers that make sure only certain things can happen to any given property.

Let's start with a simple example: say you have an object that represents a person, with properties like name and age. We could create a getter function for age that returns a string concatenating the age and the word "years old". Here's how it looks in TypeScript:

class Person {
    private _age: number;

    get age(): string {
        return `${this._age} years old`;

    set age(value: number) {
        this._age = value;

Notice the use of the get and set keywords here. The get keyword defines a getter function for age, which returns a string, and the set keyword defines a setter function for age, which takes in a single parameter of type number.

Now, whenever we want to access the age property of a Person object, we can simply call person.age, and it will return a string representation of the person's age. Similarly, we can update the age property by setting person.age = 30.

Another example I found particularly interesting involved using a getter to return a computed property value. Say we have an object representing a rectangle, with properties for its height and width. We could use a getter function to return the area of the rectangle whenever it is accessed:

class Rectangle {
    private _height: number;
    private _width: number;

    get area(): number {
        return this._height * this._width;

    set height(value: number) {
        this._height = value;

    set width(value: number) {
        this._width = value;

Now, whenever we access the area property of a Rectangle object, the getter function will compute and return the area based on the object's height and width properties. Neat, right?

I hope these examples give you a taste of how amazing it can be to use getter and setter functions in TypeScript. They're a great way to create more secure and flexible code, and can save a lot of time and headaches in the long run. Happy coding!

Working with Private and Protected Access Modifiers

Hey there, TypeScript enthusiasts! Let's talk about one particular aspect of TypeScript that some people tend to overlook: . Now, I know what you're thinking – why bother with these modifiers when I can just use public for everything? Well, there are actually some pretty nifty benefits to using private and protected.

First off, let's define what these modifiers do. When a class member is marked as private, it can only be accessed within the class itself. This means that any outside code cannot access or modify that member directly. On the other hand, a protected member can be accessed within the class and by any subclasses that inherit from that class. This allows for more controlled access to certain parts of a class, promoting encapsulation and preventing unwanted changes to class behavior.

So, how do we use these modifiers in TypeScript? It's actually quite simple – just add the private or protected keyword before the member declaration. For example, let's say we have a class called Person with a private member called name:

class Person {
  private name: string;

  constructor(name: string) { = name;

  getName() {

In this example, we can create a new instance of Person and call the getName() function to retrieve the name – but we cannot access or modify the name directly from outside the class.

const alice = new Person('Alice');
console.log(alice.getName()); // Outputs 'Alice'
console.log(; // Error: 'name' is private and cannot be accessed outside of class 'Person'

As you can see, the private keyword restricts direct access to the member. This can be incredibly useful in preventing unintended changes or manipulations of important class properties.

Protected members work similarly, but can be accessed by subclasses. Let's say we have a class called Animal with a protected member called numberOfLegs:

class Animal {
  protected numberOfLegs: number;

  constructor(numberOfLegs: number) {
    this.numberOfLegs = numberOfLegs;

class Dog extends Animal {
  constructor() {

  getNumberOfLegs() {
    return this.numberOfLegs;

Here, we create a subclass of Animal called Dog that inherits the protected numberOfLegs member. We can access this member from within the Dog class, but not from outside:

const myDog = new Dog();
console.log(myDog.getNumberOfLegs()); // Outputs 4
console.log(myDog.numberOfLegs); // Error: 'numberOfLegs' is protected and can only be accessed within the class hierarchy

How amazing is that? With private and protected access modifiers, we can create more robust and secure classes in TypeScript. Give it a try next time you're coding – your future self will thank you for it!

Advanced Getter and Setter Techniques

Alright, let's dive into some in TypeScript! I love using these because they allow for some really nifty code that can make your life as a developer a whole lot easier.

First up, let's talk about lazy instantiation. This is when you only create an object when it's actually needed, rather than creating it upfront. You can do this easily using a getter. Here's an example:

class MyClass {
  private _myProp: string;

  get myProp(): string {
    if (!this._myProp) {
      this._myProp = this.createMyProp(); // Create the object only when needed

    return this._myProp;

  private createMyProp(): string {
    // Some code to create the object
    return 'My nifty object!';

Next, let's talk about restricting access to properties. Say you only want a property to be set once, and then never changed. You can accomplish this using a setter. Here's an example:

class MyClass {
  private _myProp: string;

  set myProp(value: string) {
    if (!this._myProp) {
      this._myProp = value; // Only set the value if it hasn't been set before

Finally, let's talk about combining getters and setters. This can be really useful for creating computed properties. Here's an example:

class MyClass {
  private _firstName: string;
  private _lastName: string;

  get fullName(): string {
    return `${this._firstName} ${this._lastName}`;

  set fullName(value: string) {
    const [firstName, lastName] = value.split(' ');
    this._firstName = firstName;
    this._lastName = lastName;

How amazingd it be to have a fullName property that's automatically created based on the firstName and lastName properties?

Hopefully, these examples have given you some inspiration for how you can use getters and setters to make your TypeScript code more powerful and elegant. Happy coding!

Best Practices for Using Getters and Setters

Let me tell you, friends, getters and setters are some nifty little tools that can really enhance your TypeScript coding experience. But like with any tool, you want to make sure you're using them correctly. That's why I want to give you some tips on how to use getters and setters in the best possible way.

First of all, always make sure you're declaring your getters and setters correctly. It can be tempting to just slap a "get" or "set" in front of a method name and call it a day, but that's not going to cut it. Take the time to fully understand how getters and setters work and use them appropriately.

Another important practice is to keep your getters and setters simple. Don't try to cram too much functionality into them. They should be used to simply retrieve or set a value, not to do major calculations or manipulations.

It's also important to consider how your getters and setters may interact with other parts of your code. Be aware of any potential side effects and make sure you're not inadvertently causing issues somewhere else.

Overall, using getters and setters can be an amazing addition to your TypeScript arsenal. Just make sure you're using them correctly and keeping things simple. Imagine how amazing it would be to have clean, efficient code that makes use of these powerful tools. Trust me, it's definitely worth the effort.


All in all, getting comfortable with using get and set methods in TypeScript can be a bit of a learning curve. However, once you master it, you'll find it to be an incredibly powerful tool that can help you create amazing code structures.

Remember that get methods can be used to retrieve and manipulate private properties, giving you an unparalleled level of control over your code. Meanwhile, set methods allow you to set private properties in a way that's both secure and flexible.

So, take the time to experiment with these methods in your own TypeScript projects. Try combining them with other TypeScript features such as classes and interfaces to see how they can improve your code's organization and readability.

Who knows? With a little bit of practice, you might even find yourself creating some nifty TypeScript applications that utilize get and set methods in ways you never thought possible. Moreover, you can show off your newly gained TypeScript knowledge to co-workers, fellow developers or anyone who may be interested. How amazingd it be to share with others what you have learned here!

As a senior DevOps Engineer, I possess extensive experience in cloud-native technologies. With my knowledge of the latest DevOps tools and technologies, I can assist your organization in growing and thriving. I am passionate about learning about modern technologies on a daily basis. My area of expertise includes, but is not limited to, Linux, Solaris, and Windows Servers, as well as Docker, K8s (AKS), Jenkins, Azure DevOps, AWS, Azure, Git, GitHub, Terraform, Ansible, Prometheus, Grafana, and Bash.

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