Engineering Blog

javascript

Misunderstanding variable scope in JavaScript

Misunderstanding variable scope in JavaScript

In this post, we are going to understand variable scope and difference between var, let and const keywords in javascript. Variable scope is tricky concept for new developers., especially in javascript. Most of beginner developers make common mistake like defining the variable inside the function and expecting it to access outside the function. Understanding var,…

Using index as a key in React (anti-pattern)

What are lists in React ? Lists are used to display data which are similar in ordered format . Often they have same type i.e an array of similar kind of data rendered into a list tag using some version of for loop. How does react render lists? DOM Before we learn how react renders lists…

Utility Types in TypeScript

Utility Types in TypeScript

What are utility Types? In TypeScript, utility types are built-in types that allow you to manipulate and transform existing types. They can be used to extract, exclude, or modify the properties of an existing type, or to create a new type based on an existing one. TypeScript provides several utility types to facilitate common type…