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In JavaScript, to search for an object key in a Set, you need to understand how Sets store values and how objects behave in JavaScript. JavaScript Sets are useful objects that store unique values, making them excellent for handling distinct data. In this article, we'll explore different ways to search for an object key in a Set. JavaScript Set A Set in JavaScript is a collection of unique values. Values like numbers and strings can be compared directly, but objects are stored by reference. This means that even if two objects have the same properties, they are still seen ... Read More
The compile() method in JavaScript is a lesser-known method that has been associated with two main contexts: compiling regular expressions and validating JavaScript syntax. This method has been deprecated since JavaScript version 1.5. But developers must know about this. What is the compile() Method? The compile() method allows developers to update an existing regular expression (RegExp) object with a new pattern and flags. This is helpful when you need to change a regular expression without making a new object. Syntax and Parameters Here is the basic syntax for this: RegExpObject.compile(pattern, flags) Let's understand the parameters used with ... Read More
Extracting text enclosed in quotation marks is a common task in programming, especially when working with strings that include quotes. In JavaScript, strings are a data type used to represent text. A string is a sequence of characters enclosed in single quotes ('), double quotes ("), or backticks (`). In JavaScript, strings are a data type used to represent text. JavaScript provides multiple ways to extract text enclosed in quotation marks. This article explains how to extract words or phrases inside quotations from a string efficiently. Extracting text enclosed in quotation marks Extracting text enclosed in quotation marks can ... Read More
When working with JavaScript, handling keyboard events and creating a program that gets a variable to count up/down on keyboard press can be an essential skill. Keyboard events such as keydown and keyup in JavaScript are actions that occur when a user interacts with the keyboard. This article explains how to create a JavaScript program that increments or decrements a variable based on specific keyboard key presses. This feature can be helpful in interactive websites, like games or tools that check user input. Table of Content You can create a JavaScript program to get a variable to count up ... Read More
In JavaScript, the JSON.stringify() method is a useful tool that converts JavaScript objects into JSON strings. This is important when dealing with APIs, storing data, or transferring information between different systems. Knowing how to use JSON.stringify() helps developers manage data transformations in their applications. In this article, we will look at how JSON.stringify() works, its syntax, the parameters it uses, and some examples of how to use it well. The basic syntax for JSON.stringify() is as follows: JSON.stringify(obj, replacer, space) Let's understand the parameters used in JSON.stringify() syntax: obj: The JavaScript object to be ... Read More
The eval() function in JavaScript allows the execution of code stored as a string. It can be used to fetch specific values dynamically, but be careful, as it can have security risks and affect performance. This article will guide you on how to use eval() to get specific values and why you should generally avoid using eval(). How eval() Works? The eval() function takes a string as an argument and evaluates it as JavaScript code. For example: console.log(eval("2 + 2")); // Output: 4 Fetching Specific Values Using eval() The eval() function in JavaScript can be used to: ... Read More
JavaScript is a powerful tool for dynamically updating the Document Object Model (DOM) of a web page. The Document Object Model (DOM) is an important part of web development that allows changing the structure, content, and style of a webpage. This article explains how to update the DOM using different methods and provides examples. Understanding the DOM DOM stands for Document Object Model. The DOM represents a webpage as a tree structure, where each element is a node. JavaScript allows developers to select, modify, and manipulate these elements in real time, making web pages dynamic and interactive. Updating ... Read More
Let’s say the following is our HTML button −Click the button to add the input into the belowText BoxUse document.getElementById() to add a text in on button click. Following is the code −Example Live Demo Document Click the button to add the input into the below Text Box document.getElementById("clickButton").addEventListener("click", () =>{ document.getElementById("readTheInput").value += "JavaScript"; }); To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.OutputThis will produce the following ... Read More
In this article, we will learn to hide an element when printing a web page in JavaScript and HTML. When printing a web page, you can suppress elements such as navigation menus, advertisements, and interactive elements that you do not require on paper and print only the required information. Different Approaches The Following are the two different approaches to hiding an element when printing a web page − Using CSS Media Query Using JavaScript to Hide Elements Before Printing Using CSS Media Query The most common and efficient method to ... Read More
The following are the differences between inline JavaScript and external files − External scripts An external JavaScript file is a separate .js file linked to an HTML document using the tag with the src attribute. The browser stores the external script once it is downloaded for the first time. If it is to be referenced again, then no additional download is needed. This reduces download time and size. The async and defer attributes have an effect. If these attributes are present the script will change the ... Read More