Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles on Trending Technologies
Technical articles with clear explanations and examples
HTML5 applicationCache vs Browser Cache
HTML5 Application Cache and Browser Cache are two different caching mechanisms that serve distinct purposes in web development. Understanding their differences is crucial for optimizing web application performance. HTML5 Application Cache HTML5 Application Cache (AppCache) was a mechanism that allowed web applications to work offline by explicitly defining which resources should be cached. It used a manifest file to specify cacheable resources. // Example manifest file (cache.manifest) CACHE MANIFEST # Version 1.0 CACHE: index.html styles.css script.js logo.png NETWORK: * FALLBACK: / offline.html Browser Cache Browser cache is an automatic caching mechanism ...
Read MoreHow to Split large string in to n-size chunks in JavaScript?
A string is an order of one or more characters that contain numbers, letters, symbols, or special characters. In JavaScript strings are immutable. i.e., once you create a string you cannot change its value. For example, consider the following snippet here we have created a string variable and assigned a value (Tutorialspoint) to it. In the next statement, we are trying to change the contents of the string at the first index. Then we are displaying the contents of the string. let x = 'Tutorialspoint'; x[0] = 't'; console.log(x); // Tutorialspoint ...
Read MoreHow to add a method to a JavaScript object?
In this article, we'll go over how to add a method to a JavaScript object in JavaScript with appropriate examples. A JavaScript object is an entity which has properties. A property can be a variable or a method which define state and behavior of the object. A method is a property of an object that adds behavior to an object. We can add a method to a JavaScript object using object prototype. All JavaScript objects get their attributes and methods from a prototype. Let's understand this concept better with the help of examples further in this article. ...
Read MoreWhat is the replacement of lodash pluck() method?
Lodash's pluck() method was removed in version 4.0 because it provided the same functionality as the map() method. The pluck() method was used to extract property values from objects in an array. Using _.map() as Replacement You can replace _.pluck() with _.map() using the property shorthand syntax: import _ from 'lodash'; const objects = [{ 'a': 1 }, { 'a': 2 }, { 'a': 3 }]; console.log(_.map(objects, 'a')); [1, 2, 3] Using Native Array.map() For modern JavaScript, you can use the native Array.map() method without lodash: const objects ...
Read MoreJavaScript Location protocol Property
The location.protocol property in JavaScript returns the protocol scheme of the current URL, including the colon (:). This property is useful for determining whether a page is loaded over HTTP, HTTPS, or other protocols. Syntax location.protocol Return Value Returns a string representing the protocol scheme of the URL, including the trailing colon. Common values include: "https:" - Secure HTTP protocol "http:" - Standard HTTP protocol "file:" - Local file protocol "ftp:" - File Transfer Protocol Example ...
Read MoreCan I verify if a JavaScript variable is loaded if so, how?
To verify if a JavaScript variable has been loaded or initialized, you can check if it is undefined or has a null value. JavaScript provides several methods to perform this check effectively. The most common approaches include direct comparison with undefined and null, using the typeof operator, or checking if the variable exists in a specific scope. Method 1: Using Direct Comparison This method checks if a variable is undefined or null using strict equality: Variable Check Example ...
Read MoreMerge object properties through unique field then print data - JavaScript
Let's say we have a students object containing two properties names and marks. The names is an array of objects with each object having two properties name and roll, similarly marks is an array of objects with each object having properties mark and roll. Our task is to combine the marks and names properties according to the appropriate roll property of each object. Problem Statement The students object is given here: const students = { marks: [{ roll: 123, ...
Read MoreHow do I write a function that takes an array of values and returns an object JavaScript?
Let's say, we are required to write a function classifyArray() that takes in an array which contains mixed data types and returns a Map() with the elements grouped by their data types. For example − // if the input array is: const arr = ['class', 2, [7, 8, 9], {"name": "Michael"}, Symbol('foo'), true, false, 'name', 6]; // then the output Map should be: Map(5) { 'string' => [ 'class', 'name' ], 'number' => [ 2, 6 ], 'object' => [ [ 7, 8, 9 ], { name: 'Michael' ...
Read MoreMersenne prime in JavaScript
In Mathematics, a Mersenne prime is a number that can be written in the form M(n) = 2^n − 1 for some integer n and is actually a prime number. For example − The first four Mersenne primes are 3, 7, 31, and 127, which correspond to n = 2, 3, 5, and 7 respectively: 2² − 1 = 3 2³ − 1 = 7 2⁵ − 1 = 31 2⁷ − 1 = 127 We need to write a JavaScript function that ...
Read MoreHow do you make a button that adds text in HTML \'input\'?
You can make a button that adds text to an HTML input field using JavaScript's document.getElementById() method and event listeners. This approach allows you to dynamically modify input values when users interact with buttons. Basic HTML Structure First, create the HTML elements - a button and an input field: Click to add text Example: Adding Text on Button Click Add Text to Input Click to add "JavaScript" to ...
Read More