Introduction to JavaScript Variables JavaScript offers 3 distinct ways to declare variables: var let const Description var is the oldest way to declare variables in JavaScript, originating from its earliest versions let provides block-level scope, offering more predictable behavior and reducing the risk of errors associated with var. const is used to declare variables meant …
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In this tutorial on JavaScript arrays, we will cover how to replace all null values with a specific value. Table of Contents INTRODUCTION FINDING THE LENGTH OF AN ARRAY CREATING A FUNCTION INTRODUCTION In this tutorial, we will create a function that uses a for loop based on the length of an array. We …
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In this tutorial, we will learn how to detect file size before uploading. This guide provides clear step by step instructions to detect file size before uploading. Introduction In JavaScript, to detect the file size before uploading, we intercept the file selection event, calculate the file size, and display it to the user, providing immediate …
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In JavaScript, values are categorized into two types: primitive values and reference values. Understanding the difference between these two types is crucial for effectively managing and avoiding common pitfalls in JavaScript programming Primitive Values Primitive values are the most basic data types in JavaScript. They are immutable(values cannot be changed once created). JavaScript has 6 …
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In this tutorial, we will learn how to write a function in JavaScript. It will provide JavaScript eval() function. We learn how to write program in javascript by using java eval() function. Take JavaScript eval() function to write a program in javascript. <!DOCTYPE html> <html> <head> <meta charset=utf-8 /> <title>JavaScript program using eval() function</title> <script> …
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In this tutorial, you will learn how to Detect operating systems and browsers using JavaScript. Detect the operating system and browsers using JavaScript let’s understand it with a code explanation. let browserDetailsRef = document.getElementById(“browser-details”); let osDetailsRef = document.getElementById(“os-details”); var browserList = [ { name: “Firefox”, value: “Firefox” }, { name: “Opera”, value: “OPR” }, { …
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In this tutorial, you will learn to Create a Guess the Number game using JavaScript. We can do it by some JavaScript method or function. Creating Guess the Number game using JavaScript let’s learn this with code explanation. const hint = document.getElementById(“hint”); const noOfGuessesRef = document.getElementById(“no-of-guesses”); const guessedNumsRef = document.getElementById(“guessed-nums”); const restartButton = document.getElementById(“restart”); const …
In this blog post, you will learn how to Detect screen resolution using JavaScript. Detect screen resolution using JavaScript. let’s learn this with code. <!DOCTYPE html> <html lang=”en”> <head> <meta charset=”UTF-8″> <meta name=”viewport” content=”width=device-width, initial-scale=1.0″> <title>Document</title> <link rel=”stylesheet” href=”style.css”/> </head> <body> <h2>Your Screen Resolution is</h2> <div id=”resolution”></div> <!– script–> <script> let resolution=document.getElementById(“resolution”); resolution.textContent=${window.screen.width} x ${window.screen.height}; …
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In this blog post, you will learn how to move a div element with a mouse click in JavaScript. We can do it by ‘EventListener’ and some other function. Move a div element with a mouse click in JavaScript. let’s understand it with an explanation. <script> document.addEventListener(‘DOMContentLoaded’, function() { //rest of the code }) </script> …
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In this tutorial, you will learn how to get the color code of the element by mouse click in JavaScript. We can do it by some JavaScript method or function. Get the color code of the element by mouse click in JavaScript. let’s learn this with an explanation. <script> document.addEventListener(‘DOMContentLoaded’, function() { //rest of the …
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