JavaScript ?? In JavaScript, the double question mark ?? is called “nullish coalescing operator.” It is a relatively new addition to the language, introduced in ECMAScript 2020 (ES11). nullish coalescing operator provides a concise way to handle default values when dealing with null or undefined values. The syntax of nullish coalescing operator is as follows: […]
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Debouncing is a programming technique used to improve the performance and efficiency of certain functions, especially those triggered by events like scrolling, resizing, or typing. The purpose of debounce is to ensure that a function is not executed too frequently, particularly when the event that triggers it occurs rapidly or repeatedly. When an event is
In recursive functions, each call creates a new stack frame, leading to stack overflow errors for deep nesting. Tail call optimization reuses the same stack. In recursive functions, every time a function calls itself or another function, a new “context” is created and stored on a “stack” data structure. This stack of contexts keeps track
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In JavaScript, the ?. is called the “optional chaining” operator. It is a feature introduced in ECMAScript 2020 (ES11) . It is used to simplify accessing object properties and calling object methods , especially when dealing with nested or deeply nested objects. The optional chaining operator (?.) allows to safely access Objects properties or Object
Destructuring in JavaScript helps you to extract individually selected values from arrays or individually selected properties from objects and assign them to variables. Following examples demonstrate different use cases of destructuring: In this example, we extract the name and age properties from the person object and assign them to variables of the same name. Here,
Here are the different types of loops in JavaScript: Example: This loop will print the numbers 1 to 5 in the console. Example: This loop will print the numbers 1 to 5 in the console. Example: This loop will also print the numbers 1 to 5 in the console. Example: This loop will print the
Lets first understand the lexical scope to understand the concept of function scope and closures in javascript In the context of programming and scope, the term “lexical” refers to the concept of how the scope of variables is determined based on the physical structure (the lexical structure) of the code. Lexical scope, also known as
Event binding on dynamically created elements in JavaScript refers to the process of attaching event listeners to elements that are added to a webpage dynamically, meaning they are created or modified after the initial page load. This is a common scenario when you want to respond to user interactions on elements that are generated or
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In this blog, we will be writing script for this app using async/await and promise .then syntax . We will also write scripts for other apps as well. Keep on reading as this article is written in depth. We will first understand what is asynchronous call and callback hell. Then we will discuss different approaches
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JavaScript is a dynamically typed language, which means that you don’t have to explicitly declare the data type of a variable. JavaScript has several built-in data types, including: let car = null; console.log(car); // Output: null let name; console.log(name); // Output: undefined function greet() { // No return statement } console.log(greet()); // Output: undefined const
