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In JavaScript, an almost increasing sequence is a sequence where most elements are in non-decreasing order, with at most one element that breaks this pattern. This article demonstrates how to generate such sequences programmatically. Understanding the Problem An almost increasing sequence allows for exactly one "violation" where an element might be smaller than its predecessor. For example, [1, 3, 2, 5, 6] is almost increasing because only one element (2) breaks the increasing pattern. Our goal is to generate such sequences randomly in JavaScript. Algorithm Approach We'll create a function that generates a mostly increasing sequence ... Read More
In JavaScript, when you need to find the minimum and maximum possible sums by excluding exactly one element from an array, you can solve this efficiently using a single loop approach. The key insight is that to get the minimum sum (excluding one element), you remove the largest element. To get the maximum sum (excluding one element), you remove the smallest element. Problem Statement Given an array of integers, return an array with two values: First integer: smallest possible sum excluding any one element Second integer: greatest ... Read More
In this tutorial, we are going to learn how to disable selectability of a Circle using FabricJS. Circle is one of the various shapes provided by FabricJS. In order to create a circle, we will have to create an instance of fabric.Circle class and add it to the canvas. In order to modify an object, we have to select it in FabricJS. However, we can change this behaviour by using the selectable property. Syntax new fabric.Circle({ selectable: Boolean }: Object) Parameters ... Read More
In this tutorial, we are going to learn how to set the alignment of text in 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. Similarly, we can also set its text alignment by using the textAlign property. Syntax new fabric.Textbox(text: String, { textAlign : String }: Object) Parameters text − This parameter accepts a String which is the text string that we ... Read More
In this tutorial, we are going to learn how to find the original size of an Image using FabricJS. We can create an Image object by creating an instance of fabric.Image. 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 find the original size of an Image, we use the getOriginalSize method. Syntax getOriginalSize(): Object Return Value The method returns an object containing the width and height of the original image in pixels: { ... Read More
TypeScript is a strongly typed, object-oriented programming language built on JavaScript. One of its powerful features is the ability to enforce types of an object's indexed members using index signatures. This allows you to define the shape of objects with dynamic properties while maintaining type safety. An index signature specifies the types for both keys and values in an object. It's particularly useful when you need objects with unknown property names but known value types. Syntax interface ObjectType { [key: string]: ValueType; } // Or inline let objectName: { [key: string]: ... Read More
We are required to write a JavaScript function that takes in a number as the first argument, say n, and an array of numbers as the second argument. The function should return the smallest n-digit number which is a multiple of all the elements specified in the array. If there exist no such n-digit element then we should return the smallest such element. For example: If the array is − const arr = [12, 4, 5, 10, 9] For both n = 2 and n = 3, we need to find the smallest number ... Read More
Suppose we have an array of objects like this: const arr = [ {flag: true, other: 1}, {flag: true, other: 2}, {flag: false, other: 3}, {flag: true, other: 4}, {flag: true, other: 5}, {flag: true, other: 6}, {flag: false, other: 7} ]; We are required to write a JavaScript function that takes in one such array and sorts it based on the following conditions: If arr.flag === false, the matching ... Read More
When sorting arrays of objects in JavaScript, null values can disrupt the natural sorting order. This article shows how to sort objects by a property while ensuring null values appear at the end of the sorted array. Understanding the Problem When sorting objects by a numeric property, null values need special handling because they don't follow normal comparison rules. Our goal is to sort by the property value while pushing null values to the end. The Solution Approach We'll use a custom comparator function with JavaScript's sort() method. The key insight is to treat null values ... Read More
In JavaScript, finding the distance between items in an array involves calculating the difference between each element and all succeeding elements. This creates a matrix of distances that can be useful for various algorithms and data analysis. Suppose we have a sorted (increasing order) array of Numbers like this: const arr = [2, 5, 7, 8, 9]; We need to write a JavaScript function that takes in one such array. The function should construct a new subarray for each element of the input array containing the differences between that element and all succeeding elements. ... Read More