Javascript Optimisation Techniques with Examples

JavaScript is a powerful programming language that is used extensively in web development.

However, due to its interpreted nature, it can be slower than compiled languages like Java. Therefore, optimizing JavaScript code is an important task for any web developer looking to create high-performance, efficient web applications.

In this article, we will explore some of the key techniques for optimizing JavaScript code, including using efficient data structures, avoiding unnecessary computations, reducing DOM manipulation, and minimizing HTTP requests.

1. Use Efficient Data Structures

One of the key factors that can affect the performance of JavaScript code is the choice of data structures. Using inefficient data structures can lead to slower code, increased memory usage, and slower page loading times.

For example, consider the following code snippet, which creates an array of objects:

var data = [
  {name: 'John', age: 25},
  {name: 'Jane', age: 30},
  {name: 'Jim', age: 35}
];

While this code works fine, it can be optimized using a more efficient data structure such as a Map:

var data = new Map([  ['John'…