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Articles on Trending Technologies
Technical articles with clear explanations and examples
Explain common code blocks in JavaScript switch statement?
Common code blocks in JavaScript switch statements allow multiple cases to share the same execution code. This is achieved by omitting the break statement, causing execution to "fall through" to subsequent cases. What are Common Code Blocks? Common code blocks occur when multiple case values need to execute the same code. Instead of duplicating code, you can group cases together by omitting break statements. Syntax switch (expression) { case value1: case value2: case value3: // ...
Read MorePositive integer square array JavaScript
In JavaScript, we often need to filter arrays to extract specific types of numbers and perform operations on them. This example demonstrates how to find positive integers in an array and return the sum of their squares. Problem Statement Given an array containing various numbers (positive, negative, decimals, and integers), we need to write a function that returns the sum of squares of all positive integers only. Solution We'll use the reduce() method to iterate through the array and accumulate the sum of squares for positive integers: const arr = [1, -4, 6.1, 0.1, ...
Read MoreParse JSON in JavaScript to display a specific name/value pair?
To parse JSON in JavaScript, you can use the native JSON.parse() method or jQuery's parseJSON() function. To display specific name/value pairs, you can use array methods like forEach() or jQuery's $.each() function. Using Native JSON.parse() The modern approach uses the built-in JSON.parse() method: Parse JSON Example const APIData = '[{"Name":"John", "Age":21}, {"Name":"David", "Age":24}, {"Name":"Bob", ...
Read MoreSum of prime numbers between a range - JavaScript
We are required to write a JavaScript function that takes in two numbers, say a and b and returns the sum of all the prime numbers that fall between a and b. We should include a and b if they are prime as well. Understanding Prime Numbers A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. Examples include 2, 3, 5, 7, 11, 13, etc. Algorithm Overview To solve this problem, we need two functions: isPrime() - checks if a ...
Read MoreHow to display the selected option in a dropdown list with JavaScript?
In this tutorial, we will learn how to display the selected option in a dropdown list with JavaScript. A dropdown list is a switchable menu that enables users to select one item from various options. It's created using the tag and is commonly used in forms to gather user input. The DOM API functions getElementById() and querySelector() can be used to access a element and retrieve its selected value. Let's explore the different methods to display the selected option. Using selectedIndex Property The selectedIndex property returns the index of the currently selected option in ...
Read MoreHow to fill columns with JavaScript?
In this tutorial, we will learn how to fill columns with JavaScript using the columnFill property. This CSS property controls how content is distributed across multiple columns - either sequentially (auto) or with equal distribution (balance). The columnFill property specifies how columns should be filled when using CSS multi-column layout. It works in conjunction with columnCount to create responsive column layouts. Syntax Following is the syntax to set the columnFill property in JavaScript: selectedElement.style.columnFill = "value"; Here selectedElement is the DOM element you want to modify. The style property allows you to set ...
Read MoreStoring Credentials in Local Storage
Local Storage is designed for data that spans multiple windows and persists beyond the current session. Web applications can store megabytes of user data on the client side for performance reasons. However, storing credentials requires special security considerations. For secure credential storage, never store actual passwords or sensitive authentication data directly in local storage. Instead, use a token-based approach that minimizes security risks. Secure Token-Based Authentication On successful login, generate a completely random token string unrelated to user credentials. Store this token in your database with an expiry date, then pass it to JavaScript for local storage. ...
Read MoreHow to create multi-column layout in HTML5 using tables?
Design your webpage to display content across multiple columns using HTML tables. This approach allows you to create structured layouts with a main content area in the center, navigation menu on the left, and additional content like advertisements on the right. Basic Three-Column Layout Structure Tables provide a simple way to create multi-column layouts by using table rows () and table data cells (). Each cell acts as a separate column with customizable width and styling. Example Three Column HTML Layout ...
Read MoreUsage of border-right-width property in CSS
The border-right-width property controls the thickness of an element's right border. It only works when a border style is defined. Syntax border-right-width: value; Values Value Description thin Thin border (usually 1px) medium Medium border (usually 3px) thick Thick border (usually 5px) length Custom width (px, em, rem, etc.) Example with Different Widths .box { ...
Read MoreExplain Strict Comparison in JavaScript switch statement?
The JavaScript switch statement performs strict comparison (===) to match values. This means both value and type must be identical for a case to execute. If no strict match is found, the default case runs. Understanding Strict Comparison Strict comparison checks both value and type. For example, the number 1 is not equal to the string "1" in strict comparison: Strict Comparison Demo // Demonstrating strict vs loose comparison ...
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