To log colored text to the JavaScript console, call the console.log method and include special formatting code %c to colorize the log and pass the colorizing CSS code as the second argument. For example, to log text in red, you can use the %c formatting code, followed by the desired text and a CSS color […]
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An array is one of the key data types in JavaScript. It allows you to store values in a common place where it’s easy to access the values. This is a comprehensive guide to looping through arrays in JavaScript. You will learn multiple different and useful ways in which you can iterate over arrays. Which
7 Ways to Loop Through an Array in JavaScript (+ One to Avoid) Read More »
In JavaScript, the call() and apply() methods are both used to borrow and call a function on another object. The only difference between them is the way they accept arguments: Both methods are useful when borrowing functionality. To call a function of one object on another object you can use call() or apply(). This is
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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
How to Toggle a Boolean in JavaScript (TLDR; bool = !bool) Read More »
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,
JavaScript ‘throw new Error’ vs ‘throw Error’ vs ‘throw something’ Read More »
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
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Validating an email using JavaScript is not possible. The only 100% reliable way to validate an email address is by sending an email to the address to see if works. That being said, you can use JavaScript and regular expression patterns (regex) to ‘validate’ most of the emails. Just keep in mind you will never
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In JavaScript, the difference between for…of loop and a for…in loop is that: This guide teaches you what are the for…of and for…in loops in JavaScript. Besides, you will learn what’s the main difference via practical examples. Even though the above answer gives you a good hint about the distinction, there are useful and illustrative
JavaScript for…of vs for…in Loops (A Complete Guide) Read More »
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
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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
How to Clone JavaScript Object Except for One Key (in 4 Ways) Read More »
