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In this problem statement, our task is to sort numbers according to the digit root and implement this problem with the help of Javascript functionalities. So we can solve this problem with the help of loops in Javascript. What is digit root? The digit root of a given number is basically the sum of its digits. Repeat the calculation until the result is not a single digit. Let's take an example for the digit root, calculate the digit root for 1234, 1 + 2 + 3 + 4 = 10 = 1 + 0 = 1. Similarly the ... Read More
Suppose we have an array of Numbers that contains any frequency of exactly three elements: -1, 0 and 1 like this: const arr = [1, 1, 0, -1, 1, 0, -1, 1, 0, 0, 1]; console.log("Original array:", arr); Original array: [ 1, 1, 0, -1, 1, 0, -1, 1, 0, 0, 1 ] We are required to write a JavaScript function that takes in one such array. The function should simply sort this special array in place (without using any extra array to store the values). The only condition is that our function ... Read More
We are required to write a JavaScript function that takes in two arrays of numbers, arr1 and arr2, as the first and second argument respectively. Our function should return true if and only if every element in arr2 is the square of any element of arr1 irrespective of their order of appearance. For example, if the input to the function is: Input const arr1 = [4, 1, 8, 5, 9]; const arr2 = [81, 1, 25, 16, 64]; Output const output = true; Using Frequency Map Approach The ... Read More
In this tutorial, we are going to learn how to make an Ellipse invisible using FabricJS. Ellipse is one of the various shapes provided by FabricJS. In order to create an ellipse, we will create an instance of fabric.Ellipse class and add it to the canvas. Our ellipse object can be customized in various ways like changing its dimensions, adding a background color or by making it visible or invisible. We can do this by using the visible property. Syntax new fabric.Ellipse( { visible: Boolean }: Object) Parameters ... Read More
In this tutorial, we will explore various methods to create HTML elements from strings in JavaScript. Creating elements dynamically from strings is essential for building interactive websites, such as to-do list apps where items are added, deleted, and edited on the fly. Using createElement() Method The createElement() method is the standard way to create HTML elements dynamically in JavaScript. This method takes a string parameter representing the tag name and returns a new HTML element. Syntax document.createElement(tagName) Where tagName is a string representing the HTML tag (like "div", "p", "h1", "img"). The method ... Read More
We are required to write a JavaScript function that takes in a string. It should print out each number for every corresponding letter in the string. Letter to Number Mapping Each letter corresponds to its position in the alphabet: a = 1 b = 2 c = 3 d = 4 e = 5 ... y = 25 z = 26 Note: The function should remove any special characters and spaces, processing only alphabetic characters. Example Input and Output If the input is: "hello man" Then the output ... Read More
In JavaScript, generating all possible permutations of an array involves creating every unique arrangement of its elements. This is a common algorithmic problem that can be solved using recursion and array manipulation methods. What is Array Permutation? Array permutation refers to different arrangements of elements within an array. For an array with n elements, there are n! (factorial) possible permutations. Each permutation represents a unique ordering of the same elements. // Input array const arr = [1, 2, 3]; // All possible permutations ... Read More
For the purpose of this question, we define an interval as an array of two numbers where the first number is always smaller than the second number. For example − [4, 6], [2, 3], [6, 8], [2, 7], [1, 8] are all examples of valid intervals. Suppose, we have an array of intervals which is sorted according to their start times (the first elements of each interval). The intervals in the array are non-overlapping which means that for any two arbitrary adjacent intervals: [m, n], [x, y] m < n < x ... Read More
Validating alternating vowels and consonants is a common string pattern validation problem. We need to check if vowels (a, e, i, o, u) and consonants alternate throughout the string. Problem Statement Write a JavaScript function that takes a string of English alphabets and returns true if vowels and consonants appear alternatingly, false otherwise. For example: Input: 'amazon' Output: true Explanation: a(vowel) → m(consonant) → a(vowel) → z(consonant) → o(vowel) → n(consonant) Solution const str = 'amazon'; const appearAlternatingly = (str = '') => { if (str.length === 0) ... Read More
In this tutorial, we are going to learn how to make the controlling corners of Ellipse transparent using FabricJS. Ellipse is one of the various shapes provided by FabricJS. In order to create an ellipse, we will create an instance of fabric.Ellipse class and add it to the canvas. The transparentCorners property allows us to make the controlling corners of Ellipse transparent. Syntax new fabric.Ellipse({ transparentCorners: Boolean }: Object) Parameters options (optional) − This parameter is an Object which provides additional customizations to ... Read More