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In the given problem statement our aim is to shift every letter in the given string N places down in the alphabet with the help of JavaScript functionalities. This is also known as the Caesar cipher technique. Understanding the Problem The problem at hand is to shift each character of the given string N places down in the alphabet using JavaScript. We need to take a string as input and update it by shifting every letter N positions down in the alphabet. For example, if the letter ... Read More
Finding groups of elements in an array that sum to a desired value is a common programming problem. This involves checking combinations of consecutive elements to match both a target sum and group size. Problem Statement Given an array of numbers, we need to find how many consecutive groups of a specific length sum up to a target value. For example: const arr = [1, 2, 1, 3, 2]; const sum = 3; const num = 2; We want to find groups of 2 consecutive elements that sum to 3. The groups [1, 2] ... Read More
In this tutorial, we are going to set the color of controlling corners of Ellipse using FabricJS. The cornerColor property allows us to manipulate the color of the controlling corners when the object is active. Syntax new fabric.Ellipse({ cornerColor: String }: Object) Parameters options (optional) − This parameter is an Object which provides additional customizations to our ellipse. Using this parameter color, cursor, stroke width and a lot of other properties can be changed related to the object of which the cornerColor is ... Read More
In this tutorial, we are going to learn about how to create a canvas with a Triangle object using FabricJS. Triangle is one of the various shapes provided by FabricJS. In order to create a triangle, we will have to create an instance of fabric.Triangle class and add it to the canvas. Syntax new fabric.Triangle({ width: Number, height: Number }: Object) Parameters Options (optional) − This parameter is an Object which provides additional customizations to our triangle. Using this parameter, properties such as ... Read More
In this tutorial, we are going to set the angle of rotation of a Textbox using FabricJS. We can customize, stretch or move around the text written in a textbox. In order to create a textbox, we will have to create an instance of fabric.Textbox class and add it to the canvas. The angle property in FabricJS defines the angle of 2D rotation of an object. We also have the centeredRotation property that allows us to use the center point of a textbox as the origin of transformation. Syntax new fabric.Textbox(text: String, { angle: Number, centeredRotation: Boolean ... Read More
In this tutorial, we are going to learn about how to change the cursor width in IText object using FabricJS. The IText class was introduced in FabricJS version 1.4, extends fabric.Text and is used to create IText instances. An IText instance gives us the freedom to select, cut, paste or add new text without additional configurations. There are also various supported key combinations and mouse/touch combinations which make text interactive which are not provided in Text. Textbox, however, which is based on IText allows us to resize the text rectangle and wraps lines automatically. This is not true for ... Read More
We will learn how to implement multiple input checkbox functionality in vanilla JavaScript. The checkbox input selector will have the following features: Multiple options can be selected using checkboxes Chosen options will be displayed as a separate list with visual indicators Delete icon will be provided against each chosen option to uncheck/remove that option We will implement this functionality using only HTML, CSS, and JavaScript without any third-party libraries. Approach Create an object where keys represent checkbox labels and values (true/false) ... Read More
We are required to write a JavaScript function that takes in an array of numbers and returns true if it's either strictly increasing or strictly decreasing, otherwise returns false. In Mathematics, a strictly increasing function is that function in which the value to be plotted always increases. Similarly, a strictly decreasing function is that function in which the value to be plotted always decreases. Understanding the Concept An array has a consistent inclination when: Strictly increasing: Each element is greater than the previous one Strictly decreasing: Each element ... Read More
In JavaScript, sorting strings with decimal points requires converting them to numbers first, since string comparison would treat "10.0" as less than "2.0". This article demonstrates how to sort decimal string arrays properly. Understanding the Problem When sorting strings containing decimal numbers, JavaScript's default string comparison doesn't work numerically. For example, ['3.3', '4.4', '2.3', '1.2'] should become ['1.2', '2.3', '3.3', '4.4'], but string sorting would give incorrect results. The Solution Approach To solve this problem, we need to: Convert decimal strings to numbers using parseFloat() Sort the numbers numerically Convert back to strings if needed ... Read More
In JavaScript, finding the maximum sum of n consecutive elements in an array is a classic sliding window problem. This technique efficiently calculates the maximum sum by maintaining a window of fixed size and sliding it across the array. Understanding the Problem The goal is to find a continuous subarray of length n within the given array that has the highest possible sum. For example, given array [1, 2, 4, 7, 3, 5] and n = 3, the consecutive elements [4, 7, 3] have the maximum sum ... Read More