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In this tutorial, we are going to learn how we can flip an Ellipse object vertically using FabricJS. Ellipse is one of the various shapes provided by FabricJS. In order to create an ellipse, we will have to create an instance of fabric.Ellipse class and add it to the canvas. We can flip an ellipse object vertically using the flipY property. Syntax new fabric.Ellipse({ flipY: Boolean }: Object) Parameters options (optional) − This parameter is an Object which provides additional customizations to our ... Read More
We are required to write a JavaScript function that takes in a number and returns a number that can be represented as a power of 2 which is nearest to the input number. For example: If the input number is 145, the output should be 128 because 128 (which is 2^7) is the nearest power of 2 to 145. Understanding Powers of 2 Powers of 2 are numbers like: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512... Each number is double the previous one. Algorithm Approach The algorithm works by: ... 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 − [4, 2, 3, 1, 2, 6, 5, 8, 6, 9, 8, 4, 9, 3] Using Index-Based Approach The code for this will be − const arr1 = [4, 3, 2, ... Read More
In JavaScript, counting occurrences of a substring within a string is a common task. There are several approaches to accomplish this, from simple loops to built-in string methods. For example, counting how many times "is" appears in "this is a string" should return 2. count('this is a string', 'is') should return 2; Method 1: Using indexOf() with Loop The most reliable approach uses indexOf() to find each occurrence and increment a counter: const str1 = 'this is a string'; const str2 = 'is'; function countOccurrences(mainStr, subStr) { ... Read More
In this problem, we need to find the longest substring between two same characters in a string using JavaScript. We'll use a Map to track character positions and calculate distances between matching characters. Problem Explanation Given a string like 'abcdefa', we have two 'a' characters with 'bcdef' between them (5 characters). This becomes our longest substring between same characters. Algorithm Steps Step 1 − Define function longestSubstring with parameter 'str'. Step 2 − Initialize maxLength = 0 and begin = -1 to track the longest substring. Step 3 − Create a Map called charMap to store ... Read More
We are required to write a JavaScript function that takes in an array of integers as the first and the only argument. The function is required to count the number of all such element pairs from the array that are equal in magnitude but are present at different indices. For example, if the input array is: const arr = [7, 9, 5, 7, 7, 5]; Then the output should be: 4 because the desired pairs are [7, 7], [7, 7], [7, 7], [5, 5] How It Works The ... Read More
A binary search tree is univalued if every node in the tree has the same value. This means all nodes must contain identical data values for the tree to be considered univalued. Problem We need to write a JavaScript function that takes the root of a BST and returns true if the tree is univalued, false otherwise. For example, if the nodes of the tree are: const input = [5, 5, 5, 3, 5, 6]; Then the output should be: const output = false; Binary Search Tree Implementation ... Read More
We are required to write a JavaScript function that takes in two strings, str1 and str2 as the first and the second argument. Our function should sort str1 according to the order of characters as they appear in str2. Characters that appear first in str2 are placed first, followed by ones that come later, and finally followed by letters absent in str2. Problem Example For example, if the input to the function is: Input const str1 = 'coding'; const str2 = 'gncabdi'; Expected Output gncdio Output Explanation Looking at str2 ... Read More
In this tutorial, we are going to learn how to hide the controlling borders of an Ellipse using FabricJS. Ellipse is one of the various shapes provided by FabricJS. In order to create an ellipse, we will have to create an instance of fabric.Ellipse class and add it to the canvas. We can customize our controlling borders in many ways such as adding a specific color to it, a dash pattern etc. However, we can also eliminate the borders completely by using the hasBorders property. Syntax new fabric.Ellipse({ hasBorders: Boolean }: Object) Parameters ... Read More
In this tutorial, we are going to learn how we can flip a Textbox object horizontally 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. We can flip a textbox object horizontally using the flipX property. Syntax new fabric.Textbox(text: String, { flipX: Boolean }: Object) Parameters text − This parameter accepts a String which is ... Read More