Create a new data type in JavaScript

by vsasikalabe Updated: Feb 24, 2023

Guide Kit

Yes, you can use the concept of Class to create new data types in Javascript. We can use instanceof to check the actual data type. It tells about the data type. typeof is a JavaScript keyword. When you call it, this will return the type of variable. To validate function parameters or check if variables are defined, the keyword typeof is used. In our code, it is an effortless way to check the variable type. In Javascript, there are five basic, or primitive, types of data strings, numbers, booleans, undefined, and null.

It has six basic data types in JavaScript. The data types specify the data that can be stored and exploited within a program. It is again split into three main categories: primitive (or primary), composite (or reference), and special data types.

Primitive data types - String, Number, and Boolean.
Composite data types - Object, Array, and Function
Special data types - Undefined and Null

It returns the boolean value. Its behavior can be customized with Symbol. To check the object type at run time, the instanceof operator is used in JavaScript. If true, it returns a boolean value, then signifies that the object is an instance of a certain class, and if false, then it is not.

Here is an example of how to create a new Data type using Javascript:

Preview of the output that you will get on running this code from your IDE.

Code

Is it possible to create a new data type in JavaScript?

JavaScriptLines of Code : 17License : Strong Copyleft (CC BY-SA 4.0)

class Person {
  constructor(name, age) {
    this.name = name; 
    this.age = age;
  }
}

const bill = new Person("Bill", 40);

function checkType(data){
  if(data instanceof Person) return "Person";
  return typeof data; 
}

console.log(bill instanceof Person);
console.log(checkType(bill));
console.log(checkType("bill"));

Instructions

Follow the steps carefully to get the output easily.

Download and Install VS Code on your Desktop.
Open the VS Code and install Javascript ES6 Code Snippet and Code Runner from Extensions.
Open the new file and save as example.js (event.js)
Copy the code using the "Copy" button above, and paste it in your javascript file.
Run the code using (ctr+alt+N) Run button.

I hope you found this useful. I have added version information in the following sections.

I found this code snippet by searching for ' Create a new data type in JavaScript' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

The solution is created in VS Code 1.73.1 version.
JavaScript (ES6) code snippets v1.8.0
Code Runner v0.11.8

Using this solution, we are able to Create a new data type in JavaScript with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to Create a new data type in JavaScript.

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