You may have encountered javascript:void(0) in an HTML document as a href attribute like this: A common reason why developers use javascript:void(0) trick is to prevent the page from reloading when clicking a link. This comprehensive guide teaches you: Speaking of examples, I think the best way to learn what javascript:void(0) does is by taking […]

This guide teaches you 7 different ways to convert a string to a number in JavaScript. Here is a quick overview of the methods you’re about to learn: Let’s take a more detailed look at each of these approaches and also consider whether it makes sense to use them or not. 1. The parseInt() Function

To toggle a boolean value in JavaScript, use the not operator (!). This operator negates the boolean value, so if the value is true, it will become false, and if the value is false, it will become true. Here’s an example of how to toggle a boolean: Output: What Is the Not (!) Operator in

To find (and not delete) duplicates in a JavaScript array, you can use this function: Example use: Output: To learn how the above approach works, and what alternatives exist, please keep on reading. This guide shows you ways to find array duplicates and show them instead of deleting them. Besides, you will learn what performance

In JavaScript the difference between throw Error and throw new Error is that: When it comes to behavior, there’s really no difference between throw Error and throw new Error. For example: But the more technically correct way to throw a new Error object is by using the throw new Error instead of throw Error. Also,

There are several ways to clone a JavaScript object except for one key. The easiest way is to use Object.assign() method to clone an object and then delete the desired key. For example: This guide shows you 4 different ways to clone a JavaScript object by leaving one (or more) keys out. 1. Using the

In JavaScript, you can use a for loop to repeat a task based on a condition. As long as the condition is true, the looping continues. When the condition becomes false, the loop terminates. For example, let’s display numbers from 0 to 5 using a for loop: Output: In this particular for loop, the condition

In JavaScript, the array is an extremely commonly used data type. You can use an array in a variety of tasks to store and access values with ease. Some common tasks you want to do with arrays include: And so much more. The Array data structure comes with a bunch of helpful built-in methods. You

In JavaScript, the bind() method allows you to copy a method from an object. More importantly, you can use the copied method as an independent function but still be able to access the object’s values. Here’s an example that shows how you can use the bind() method: In this example, the greet function is a

In JavaScript, the call() method calls a function like a traditional function call but with a custom this value. This can be useful for borrowing methods from other objects, or for assigning a new this value when calling a function. This is a comprehensive guide to understanding how the call() method works in JavaScript. You