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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to allocate memory to an object whose length is set to 0 - JavaScript?
In JavaScript, you can manipulate array length to clear memory and allocate new slots. When you set an array's length to 0, it clears all elements. Setting length to a larger value allocates empty slots. Understanding Array Length Property The length property controls how many elements an array can hold. Setting it to 0 removes all elements, while setting it to a larger number creates empty slots filled with undefined. var arrayObject = [ "John", "David", "Mike" ]; console.log("Original array:", arrayObject); console.log("Original ...
Read MoreFinding product of an array using recursion in JavaScript
We are required to write a JavaScript function that takes in an array of numbers. Our function should do the following two things: Make use of a recursive approach. Calculate the product of all the elements in the array. And finally, it should return the product. For example, if the input array is: const arr = [1, 3, 6, 0.2, 2, 5]; Then the output should be: 36 How Recursion Works Recursion breaks down the problem into smaller subproblems. For ...
Read MoreFinding the Largest Triple Product Array in JavaScript
We are required to write a JavaScript function that takes in an array of integers as the only argument. Based on the array taken in as input, the function should construct a new array of the same length based on the following criteria. Any corresponding element of the output array should be the product of the three largest numbers encountered thus far. If the corresponding index is less than 3 (we have not encountered three elements yet) then the corresponding value should be -1. Although we can use non-unique values to calculate the product, those non-unique values should ...
Read MoreFinding astrological signs based on birthdates using JavaScript
We are required to write a JavaScript function that takes in a date object and returns the astrological sign related to that birthdate based on zodiac date ranges. Understanding Zodiac Signs Each zodiac sign corresponds to specific date ranges throughout the year. The challenge is handling the transition dates correctly, especially for signs that span across months. Example Following is the code: const date = new Date(); // as on 2 April 2021 const findSign = (date) => { const days = [21, 20, 21, 21, 22, 22, 23, 24, 24, 24, 23, 22]; const signs = ["Aquarius", "Pisces", "Aries", "Taurus", "Gemini", "Cancer", "Leo", "Virgo", "Libra", "Scorpio", "Sagittarius", "Capricorn"]; let month = date.getMonth(); let day = date.getDate(); if(month == 0 && day
Read MoreLength of shortest unsorted array in JavaScript
We are required to write a JavaScript function that takes in an array of numbers and finds the length of the shortest continuous subarray that, when sorted, makes the entire array sorted in ascending order. Our function needs to find the length of one continuous subarray such that if we only sort this subarray in ascending order, then the whole array will be sorted in ascending order, too. Problem Example For example, if the input array is: const arr = [3, 7, 5, 9, 11, 10, 16]; console.log("Original array:", arr); Original array: ...
Read MoreHow to apply function against an accumulator and each key of object in JavaScript?
In JavaScript, we can use the reduce() method to apply a function against an accumulator and each element of an array (from left to right). This method is particularly useful when working with arrays of objects where we need to process each key-value pair. The reduce() method is called on a given array and takes a callback function as its first argument. Please refer to Array reduce() for more details. Syntax array.reduce(callback[, initialValue]) Parameters callback − Function to execute on each value in the array. ...
Read MoreFabric.js – How to check if an Image object is fully contained within the area of another object?
In this tutorial, we are going to learn how to check if an Image object is fully contained within the area of another object 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 check if an Image object is fully contained within the area of another object, we use the isContainedWithinObject method. Syntax isContainedWithinObject(other: Object, absolute: Boolean, calculate: Boolean): Boolean Parameters other ...
Read MoreWhy do we Use JavaScript in HTML?
JavaScript transforms static HTML pages into dynamic, interactive websites. When a website displays timely content updates, interactive maps, animated visuals, or responsive user interfaces, JavaScript is the technology making it happen. As a scripting language, JavaScript adds advanced functionality to websites and represents the third essential layer of modern web development. The Three Layers of Web Development Modern web pages are built using three complementary technologies that work together: HTML (Structure): The markup language that defines the content structure and meaning. HTML creates paragraphs, headings, lists, and embeds images and videos into web ...
Read MoreHow to add a clipping area on a Polygon using FabricJS?
We can create a Polygon object by creating an instance of fabric.Polygon. A polygon object can be characterized by any closed shape consisting of a set of connected straight line segments. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity etc. A clipping path restricts the area to which fill or stroke is applied in a Polygon object. Therefore, the parts of the polygon which lie outside the clipping path, will not be drawn. In order to add a clipping area we use the clipPath property. ...
Read MoreFetch specific values from array of objects in JavaScript?
Fetching specific values from an array of objects is a common JavaScript task. This article demonstrates multiple approaches to filter and extract data based on specific criteria. Sample Data Let's start with an array of employee objects: const details = [ { employeeFirstName: "John", employeeLastName: "Doe" }, { employeeFirstName: "David", employeeLastName: "Miller" ...
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