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In this tutorial, we will create a functional analog clock using HTML, CSS, and JavaScript. The clock will display the current time with three hands representing hours, minutes, and seconds that move in real-time. Approach Create the clock structure using HTML with three div elements for the hands Style the clock face and hands using CSS positioning and transforms Use JavaScript's Date object to get current time and calculate hand rotations Update the clock every second using setInterval() Understanding the Time Calculations ... Read More
We can create a Polygon object by creating an instance of fabric.Polygon. A polygon object can be characterized by any closed shape consisting of a set of connected straight line segments. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity etc. In order to add rotation animation, we can use the angle property in conjunction with animate method. Syntax animate(property: String | Object, value: Number | Object): fabric.Object | fabric.AnimationContext | Array. Parameters ... Read More
We can create a Polygon object by creating an instance of fabric.Polygon. A polygon object can be characterized by any closed shape consisting of a set of connected straight line segments. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity etc. In order to implement copy paste programmatically, we need to use the clone method. Syntax clone(callback: Function, propertiesToInclude: Array) Parameters callback (optional) − This parameter is a callback function which is invoked with a clone as its ... Read More
Generally, the ID given to any element in an HTML document is unique and can be assigned to an element only once. However, it is possible to change that ID later using JavaScript while following the same rule of uniqueness for the new ID. In this article, we will learn how to change the ID of an element using JavaScript. JavaScript provides the id property to get the ID of any element as well as to change or add a new ID to any HTML element in the document. Syntax The following syntax shows how to use ... Read More
In JavaScript, it is common to use a string as a key for an object, especially when you want to dynamically create or change the properties of the object. Objects are fundamental data structures that allow you to store collections of data in key-value pairs. You can use strings as keys directly. It is a simple and straightforward method. This article will guide you how to use a string as a key for an object. Using Computed Property Names (ES6) The most modern approach is using computed property names with bracket notation inside the object literal. This allows ... Read More
We are required to write a JavaScript function that takes in an array of Numbers as the first argument and a target sum Number as the second argument. The function should return an array of all those subarrays from the original array whose elements sum to make the target sum. We can use a single number multiple times to achieve the sum. For example − If the input array and number are − const arr = [1, 2, 4]; const sum = 4; then the output should be − [ ... Read More
Suppose, we have the following array of arrays: const arr = [ [ ['dog', 'Harry'], ['age', 2] ], [ ['dog', 'Roger'], ['age', 5] ] ]; We are required to write a JavaScript function that takes in one such nested array. The function should then prepare an object based on the array. The object for the above array should look like: const output = [ {dog: 'Harry', ... Read More
In mathematics, the median is the middle value in an ordered (sorted) list of numbers. If the list has an even number of elements, the median is the average of the two middle values. Problem Statement We need to write a JavaScript function that takes an array of integers and a window size, then calculates the median for each sliding window of that size. The function returns an array containing all the calculated medians. For example, given: const arr = [5, 3, 7, 5, 3, 1, 8, 9, 2, 4, 6, 8]; const windowSize = ... Read More
In this tutorial, we will see how to convert 3-digit color code to 6-digit color code in JavaScript. A 3-digit hex color code represents colors in #RGB format, where each digit controls red, green, and blue values. To convert to 6-digit format, we duplicate each character: #RGB becomes #RRGGBB. For example: 3-digit: #08c 6-digit: #0088cc 3-digit: #f4a 6-digit: #ff44aa Algorithm Step 1: Check if the input length is exactly 3 characters Step 2: Split the string into individual characters using split("") Step 3: Use map() to duplicate each character ... Read More
A textarea is an HTML element that provides a multi-line text input field with dynamic width and height. By default, textareas appear as rectangular boxes, but you can change their shape using JavaScript to modify CSS properties. In this article, we'll explore different methods to transform textarea shapes using JavaScript, including creating parallelograms and ellipses through CSS property manipulation. Using transform Property for Parallelogram Shape The transform property with skew() function can transform a rectangular textarea into a parallelogram by skewing it along the X or Y axis. Syntax element.style.transform = "skew(angle)"; ... Read More