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Articles on Trending Technologies
Technical articles with clear explanations and examples
What is JavaScript used for?
JavaScript is a versatile programming language that powers interactive web experiences and modern applications. Originally designed for web browsers, JavaScript has evolved into a full-stack development language used for frontend interfaces, backend servers, mobile apps, and even desktop applications. Core Applications of JavaScript JavaScript serves multiple purposes across different platforms and environments. Let's explore the primary use cases where JavaScript excels. Web Development and Interactive Features JavaScript's primary role is making websites interactive and dynamic. It transforms static HTML pages into engaging user experiences through: Form validation and user input handling ...
Read MoreUsing the get in JavaScript to make getter function
The get keyword in JavaScript creates a getter method that allows you to access object properties like regular properties while executing custom logic behind the scenes. Syntax const obj = { get propertyName() { // Custom logic return value; } }; Basic Example const studentDetails = { _name: "David Miller", get studentName() { ...
Read MoreFinding the longest "uncommon" sequence in JavaScript
We are required to write a JavaScript function that takes in an array of strings. The function should find the longest uncommon subsequence among the strings of the array. By longest uncommon subsequence we mean the longest subsequence of one of these strings and this subsequence should not be any subsequence of the other strings. Our function should return the length of this longest uncommon subsequence. For example: If the input array is − const arr = ["aba", "cdc", "eae"]; Then the output should be 3. Understanding the Problem The key ...
Read MoreSubarray pairs with equal sums in JavaScript
We are required to write a JavaScript function that takes in an array of integers as the only argument. The function should determine whether there exists any way in which we can split the array into two subarrays such that the sum of the elements present in the two subarrays are equal. While dividing the elements into subarrays we have to make sure that no element from the original array is left. Problem Understanding For example, if the input array is: const arr = [5, 3, 7, 4, 1, 8, 2, 6]; Then ...
Read MoreDNA to RNA conversion using JavaScript
Deoxyribonucleic acid (DNA) is the primary information storage molecule in biological systems. It is composed of four nucleic acid bases: Guanine ('G'), Cytosine ('C'), Adenine ('A'), and Thymine ('T'). Ribonucleic acid (RNA) is the primary messenger molecule in cells. RNA differs slightly from DNA in its chemical structure and contains no Thymine. In RNA, Thymine is replaced by another nucleic acid called Uracil ('U'). Problem We need to write a JavaScript function that translates a given DNA string into RNA by replacing all 'T' nucleotides with 'U' nucleotides. Using For Loop The most straightforward approach ...
Read MoreMerging nested arrays to form 1-d array in JavaScript
We are required to write a JavaScript function that takes in two nested arrays, arr1 and arr2, as the first and the second argument. Our function should create and return a third array that contains all the elements of arr1 and arr2 but flattened to single dimension For example, if the input to the function is — const arr1 = [ 1, [ 2, [ 4, 5, [ ...
Read MoreHow to use Static Variables in JavaScript?
The keyword "static" is used for defining static methods or properties of a class in JavaScript. Static members belong to the class itself rather than to instances of the class, meaning you can access them without creating an object. Static variables maintain a single value that is shared across all instances of the class. Unlike instance variables, static variables are initialized when the class is first loaded and retain their value throughout the program's execution. Note − Static variables can be reassigned and modified, unlike const variables which are immutable after initialization. Syntax class ClassName ...
Read MoreHow to run a given array of promises in series in JavaScript?
In JavaScript, there is a method called "Promise.all" that allows you to run an array of promises in parallel. However, sometimes you may want to run your promises in series instead. This can be useful if you want to make sure that each promise is executed one after the other, or if you need to use the result of one promise in the execution of the next promise. There are a few different ways that you can run an array of promises in series in JavaScript. In this article, we'll take a look at a few of them. ...
Read MoreCan Search Engines Index JavaScript?
JavaScript creates dynamic, interactive web experiences, but it presents unique challenges for search engine crawling and indexing. Understanding how search engines handle JavaScript is crucial for SEO success. How Search Engines Crawl JavaScript When crawling traditional HTML pages, the process is straightforward and fast. Googlebot downloads HTML files, extracts links from source code, and indexes content immediately. However, JavaScript-heavy websites require a more complex process: Googlebot downloads the initial HTML file but may not see JavaScript-generated links in the source code CSS and JavaScript files are then downloaded separately Google's Web Rendering Service (WRS) must parse, ...
Read MoreFetch alternative even values from a JavaScript array?
To fetch alternative even values from a JavaScript array, you need to iterate through the array and check if the index is even using the modulo operator. An index is even when index % 2 == 0. Syntax if (index % 2 == 0) { // This will select elements at even positions (0, 2, 4, ...) } Example The following example demonstrates how to fetch alternative even values from an array: var subjectsName = ["MySQL", "JavaScript", "MongoDB", "C", "C++", "Java"]; for (let index = 0; index ...
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