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When working with arrays of arrays in JavaScript, you might need to find the index position of a specific sub-array within the main array. This is useful for checking if a particular array exists and determining its location. Suppose we have an array of arrays like this: const arr = [ [1, 0], [0, 1], [0, 0] ]; We need to write a JavaScript function that takes an array of arrays as the first argument and a target array as the second argument. The function should ... Read More
In JavaScript, calculating the average of array elements using the reduce() method is an efficient and elegant approach. The reduce() method iterates through the array once to compute the sum, which we then divide by the array length. Understanding the Problem We need to calculate the average value of all elements in an array using JavaScript's reduce() method. For example, given the array [1, 2, 3, 4, 5], the average would be (1 + 2 + 3 + 4 + 5) / 5 = 15 / 5 = 3. Algorithm Step 1: Create a function that ... Read More
We are required to write a JavaScript function that takes in a string as the only argument. The string is likely to contain question marks (?) in the beginning and the end. The function should trim off all these question marks from the beginning and the end keeping everything else in place. For example − If the input string is − const str = '??this is a ? string?'; Then the output should be − 'this is a ? string' Method 1: Using Regular Expressions The simplest approach uses ... Read More
Padovan Sequence The Padovan sequence is a sequence of integers P(n) defined by the initial values: P(0) = P(1) = P(2) = 1 and the recurrence relation: P(n) = P(n-2) + P(n-3) The first few values of P(n) are: 1, 1, 1, 2, 2, 3, 4, 5, 7, 9, 12, 16, 21, 28, 37, 49, 65, 86, 114, 151, 200, 265, ... Problem We need to write a JavaScript function that takes in a number n and returns the nth term of the Padovan sequence. Using Iterative Approach The most efficient approach uses iteration to calculate the sequence step by step: const padovan = (num = 1) => { // Handle base cases if (num
In this tutorial, we are going to learn how to lock the vertical skewing of a Circle using FabricJS. Just as we can specify the position, colour, opacity and dimension of a circle object in the canvas, we can also specify whether we want to stop skewing an object vertically. This can be done by using the lockSkewingY property. Syntax new fabric.Circle({ lockSkewingY : Boolean }: Object) Parameters options (optional) − This parameter is an Object which provides additional customizations to our circle. ... Read More
In this tutorial, we are going to learn how to lock the rotation of a Triangle using FabricJS. Just as we can specify the position, colour, opacity and dimension of a triangle object in the canvas, we can also specify whether we want it to rotate or not. This can be done by using the lockRotation property. Syntax new fabric.Triangle({ lockRotation : Boolean }: Object) Parameters Options (optional) − This parameter is an Object which provides additional customizations to our ... Read More
In this tutorial, we are going to learn about how to make a text path in IText invisible 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
To calculate the date three months prior using JavaScript, we will first need to create a new date object, which will represent the current date. We will then use the setMonth() method to subtract 3 from the current month. Finally, we will convert this new date object back to a string using the toString method to display the date three months prior. Basically, we will be writing a dynamic JavaScript function that can take in a number as its input and return the date prior to that number of months from today's date. For example − ... Read More
Suppose we have an array of objects containing some years and weeks data like this: const arr = [ {year: 2017, week: 45}, {year: 2017, week: 46}, {year: 2017, week: 47}, {year: 2017, week: 48}, {year: 2017, week: 50}, {year: 2017, week: 52}, {year: 2018, week: 1}, {year: 2018, week: 2}, {year: 2018, week: 5} ]; We are required to ... Read More
We are required to compare, and get the difference, between two arrays containing single character strings appearing multiple times in each array. Example of two such arrays are: const arr1 = ['A', 'C', 'A', 'D']; const arr2 = ['F', 'A', 'T', 'T']; We will check each character at the same position and return only the parts who are different. Approach The algorithm compares elements at the same index position. When characters differ, both are added to the result array. Any remaining elements from the longer array are also included. Example ... Read More