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In JavaScript, you can access properties and methods of one object from another object by referencing them directly. This technique is useful for sharing data between objects or creating relationships. Basic Property Access The simplest way is to reference properties directly from another object: Object Access Example CLICK HERE // First object with properties and method let obj = { firstName: "Rohan", lastName: "Sharma", welcome() { ... Read More
We are required to write a JavaScript function that takes in two arrays and merges the arrays taking elements alternatively from the arrays. For example, if the two arrays are: const arr1 = [4, 3, 2, 5, 6, 8, 9]; const arr2 = [2, 1, 6, 8, 9, 4, 3]; Then the output should be: const output = [4, 2, 3, 1, 2, 6, 5, 8, 6, 9, 8, 4, 9, 3]; Method 1: Using Index-Based Logic This approach uses a single loop and alternates between arrays based on even/odd ... Read More
In JavaScript, serializing an array means converting it into a string format that can be stored, transmitted, or reconstructed later. While jQuery's serializeArray() method is useful for form data, JavaScript provides native methods for general array serialization. What is Array Serialization? Array serialization converts a JavaScript array into a string representation. The most common approach uses JSON.stringify() to convert arrays into JSON strings, which can be easily transmitted to servers or stored in local storage. Using JSON.stringify() (Recommended) The JSON.stringify() method is the standard way to serialize JavaScript arrays: // Simple array serialization let ... Read More
This tutorial will help you to find the arccosine in radians of a number in JavaScript. Cosine is the ratio of the adjacent side and the hypotenuse of the right-angled triangle. To get the cosine of a number, the Math.cos() function is used in JavaScript. The value returned will be between -1 and 1. The inverse of cosine is called arccosine. An angle's trigonometric arccosine value can be calculated using the Math.acos() method. This returns a value between 0 and π (pi). The input to acos() must be between -1 and 1 inclusive. The function returns the ... Read More
Custom JavaScript exceptions allow you to create specific error types for your application. You can throw custom error messages or create custom error classes for better error handling. Basic Custom Exception with String The simplest way to create a custom exception is by throwing a string message: function divide(a, b) { try { ... Read More
The onreset event is triggered when a form is reset using a reset button or the reset() method. This event allows you to execute JavaScript code when users clear form data. Syntax // form elements // Or using addEventListener form.addEventListener('reset', functionName); Example: Basic onreset Event onreset Event Example function resetFunct() { alert("The form was ... Read More
To set the type of the list-item marker, use the listStyleType property in JavaScript. This property allows you to change bullet styles for unordered lists and numbering styles for ordered lists. Syntax element.style.listStyleType = "value"; Common List Style Types Here are the most commonly used marker types: Value Description Best for disc Filled circle (default) Unordered lists circle Empty circle Unordered lists square Filled square Unordered lists decimal Numbers (1, 2, 3...) Ordered lists upper-roman Uppercase Roman (I, II, III...) Ordered ... Read More
To detect clicks on Bezier path shapes in HTML5 Canvas, you need to use pixel-based detection since Canvas doesn't have built-in shape hit testing. This technique draws the shape invisibly and checks if the clicked pixel contains color data. How Pixel-Based Detection Works The method involves drawing the Bezier shape to a hidden canvas context, then checking if the clicked coordinates contain any pixels. If the alpha channel is greater than 0, the click hit the shape. Complete Click Detection Example const canvas = document.getElementById('myCanvas'); const ctx = canvas.getContext('2d'); // Sample Bezier ... Read More
In JavaScript, a dictionary (or object) stores key-value pairs. There are several ways to loop through these pairs depending on whether you're working with plain objects, ES6 Maps, or custom implementations. Method 1: Using for...in Loop (Plain Objects) The for...in loop is the traditional way to iterate through object properties: const dictionary = { key1: "value1", key2: "value2", key3: "value3" }; for (let key in dictionary) { console.log(`Key: ${key}, Value: ${dictionary[key]}`); } Key: key1, Value: value1 ... Read More
We can identify the nth sub element using xpath in the following ways: By adding square brackets with index. By using position() method in xpath. Method 1: Using Square Brackets with Index The most common approach is to add square brackets with the desired index number after the element selector: // Select the 2nd div element //div[2] // Select the 3rd li element inside ul //ul/li[3] // Select the first input with type='text' //input[@type='text'][1] Method 2: Using position() Function The position() function provides another way to target elements ... Read More