JavaScript

In JavaScript, the isExtensible() method is used to determine if new properties can be added to an object. This method checks the extensibility of an object, which means if it can be modified to add new properties or not. By default, any object in JavaScript is extensible unless it has been used as an argument to certain methods like Object.freeze(), Object.seal(), or Object.preventExtensions(). These methods restrict the modification capabilities of an object....

In JavaScript, the Number.isSafeInteger() method is used to determine if a given number is a “safe integer” or not. A safe integer is defined as one that can be exactly represented as an integer, without any loss of precision. While a number may satisfy the Number.isInteger() method, it may not necessarily be considered a safe integer if it exceeds the boundaries of safe integers. The boundaries of safe integers in JavaScript are defined as anything greater than 2^53 or less than -2^53....

Learn all about the isSealed() method of the Object object in JavaScript. The isSealed() method accepts an object as an argument and returns true if the object is sealed, and false otherwise. An object is considered sealed when it is a return value of the Object.seal() function. Here’s an example illustrating the usage of isSealed(): const dog = {} dog.breed = 'Siberian Husky' const myDog = Object.seal(dog) Object.isSealed(dog) // true Object....

Learn more about the seal() method in JavaScript, which is used to restrict the modification of an object’s properties. The seal() method, when called on an object, returns the same object. The object passed as an argument is mutated and becomes immutable. This means that new properties cannot be added to it, existing properties cannot be removed, but they can still be modified. Here’s an example to demonstrate it: const dog = {} dog....

Welcome to the JavaScript Cookbook, a compilation of helpful articles that provide step-by-step instructions on how to perform common tasks in JavaScript. Whether you’re a beginner or an experienced developer, you’ll find practical solutions to enhance your JavaScript skills. Note: This document is continuously updated with new content, ensuring that you have access to a wealth of valuable how-tos. Strings How to Uppercase the First Letter of a String in JavaScript: Learn how to capitalize the first letter of a string using JavaScript....

The for...of loop is a powerful and concise way to iterate over elements in JavaScript. It combines the ease of use of forEach loops with the added flexibility to break out of the loop whenever necessary. The syntax for the for...of loop is as follows: const list = ['a', 'b', 'c']; for (const item of list) { console.log(item); } With this loop, you can easily iterate over each element in the list array and perform any desired actions....

In frontend development, there are several terms that may be unfamiliar to you. This glossary provides explanations of these terms to help you better understand JavaScript and frontend development concepts. Let’s dive in! Terms Asynchronous Asynchronous code allows you to initiate a task, forget about it, and receive the result when it’s ready, without having to wait for it. An example is an AJAX call, where you can continue with other tasks while waiting for the response....

Learn the basics of using the JavaScript if conditional in your code. An if statement is a powerful tool in JavaScript that allows you to control the flow of your program based on the evaluation of an expression. By using conditionals, you can make your program take different paths depending on certain conditions. Let’s start with a simple example that always executes: if (true) { // code to be executed } In this case, the code inside the if block will always run because the expression true evaluates to true....

The Math object in JavaScript is a powerful tool for performing various mathematical operations. This tutorial will provide an overview of the Math object and its functions. Constants The Math object contains several constants that are commonly used in mathematical calculations. These constants include: Math.E: The base of the natural logarithm, approximately equal to 2.71828. Math.LN10: The natural logarithm of 10. Math.LN2: The natural logarithm of 2. Math.LOG10E: The base 10 logarithm of e....

In JavaScript, the spread operator ... allows you to expand arrays, objects, and strings. Understanding how to utilize this operator can significantly enhance your coding capabilities. Let’s explore its various applications and examples. Expanding Arrays To create a new array by expanding an existing one, you can use the spread operator. Take the following array a as an example: const a = [1, 2, 3]; Using the spread operator, you can easily create a new array b by appending additional elements:...