December 2023– date –

This article explains how to define your own functions using variable arguments in JavaScript. I want to create my own function using variable arguments, but how should I define it? To create a custom function with variable arguments, us...

This article explains in detail how to override base class methods in JavaScript. How can I override a base class method? Use overrides to override base class methods. 【How to call a superclass method from a subclass】 superUse keywords...

This article explains how to use JavaScript's getElementsByTagName method to retrieve elements using the HTML tag name as a key. Is it possible to retrieve HTML elements using tag names as keys? Using the getElementsByTagName method, you...

By creating your own functions in JavaScript, you can create reusable code and achieve efficient development. In this article, we will explain in detail how to create your own functions. I want to create my own function, what should I do...

This article explains how to use the Map object and map method in JavaScript . One way to handle associative arrays is to use Map objects. Also, what is the map method? A Map object is an object for handling associative arrays, which sto...

We will explain in detail how to inherit classes using extends in JavaScript. I don't really understand how to inherit classes, so I'd like some help! of course. Let's explain in detail how to inherit classes in JavaScript. 【Basic conce...

This article explains how to remove duplicates from an array using JavaScript. How can I remove duplicates from an array? The easiest way is to use a Set object. 【How to delete duplicates using Set object】 　A Set object is a type...

In JavaScript, we will explain how to generate random numbers using the methods of the Math object and the library that generates random numbers. JavaScript has a method called Math.random() for generating random numbers. 【"random" meth...

This article explains how to return multiple values ​​from a JavaScript function. Is there a way to return multiple values ​​from a function? There are two ways to return multiple values: using arrays and objects, and using tables. 【How...

We will explain in detail how to use " querySelector " and " querySelectorAll " , which are used when retrieving elements from an HTML document in JavaScript . Do you have any recommendations on how to retrieve elements from an HTML docu...