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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to split last n digits of each value in the array with JavaScript?
We have an array of mixed values like numbers and strings, and we want to extract the last n digits from each element that has enough characters. const arr = ["", 20191219, 20191220, 20191221, 20191222, 20191223, 20191224, 20191225]; We need to write a JavaScript function that takes this array and a number n. If an element contains more than or equal to n characters, the function should return only the last n characters. Otherwise, the element should remain unchanged. Solution Here's how we can implement this function using the map() method and string manipulation: ...
Read MoreHow can I find the index of a 2d array of objects in JavaScript?
To find the index of a specific object in a two-dimensional array, you need to search through both rows and columns. This involves using nested loops to traverse the matrix structure. Syntax function find2DIndex(matrix, searchCondition) { for (let row = 0; row < matrix.length; row++) { for (let col = 0; col < matrix[row].length; col++) { if (searchCondition(matrix[row][col])) { ...
Read MoreConcatenating variable number of arrays into one - JavaScript
We are required to write a JavaScript function that takes in any number of JavaScript arrays and returns one single array with all the values from input arrays concatenated into it. For example − If the input arrays are − [1, 5], [44, 67, 3], [2, 5], [7], [4], [3, 7], [6] Then the output should be − const output = [1, 5, 44, 67, 3, 2, 5, 7, 4, 3, 7, 6]; Using reduce() and concat() The most straightforward approach uses the reduce() method combined with concat() to merge ...
Read MoreHow and why does 'z'['toUpperCase']() in JavaScript work?
In JavaScript, the syntax 'z'['toUpperCase']() works because strings are objects, and you can access object methods using both dot notation and bracket notation. This alternative syntax calls the toUpperCase() method on the string 'z', converting it to uppercase. Syntax 'z'['toUpperCase']() // Returns 'Z' This is equivalent to the more common dot notation: 'z'.toUpperCase() // Returns 'Z' Why Does This Work? In JavaScript, there are two ways to access object properties and methods: Dot notation: object.property Bracket notation: object['property'] String literals like ...
Read MoreHTML5 Input type=number removes leading zero
HTML5's input type="number" automatically removes leading zeros because it treats the value as a numeric data type. This creates issues when you need to preserve leading zeros, such as for international phone numbers, postal codes, or ID numbers. The Problem When using type="number", browsers strip leading zeros from the input value: Show Value function showValue() { let input = document.getElementById('numberInput'); ...
Read MoreHTML5 tag
The HTML5 tag is used to create radial gradients in SVG graphics. It defines a smooth color transition that radiates from a center point outward in a circular pattern, making it perfect for creating lighting effects, shadows, and visual depth in SVG elements. Syntax Key Attributes cx, cy: Center point coordinates of the gradient (default: 50%) r: Radius of the gradient (default: 50%) fx, fy: Focal point coordinates for gradient focus gradientUnits: Coordinate system ("objectBoundingBox" or "userSpaceOnUse") Example: ...
Read MoreUsage of border-right-color property in CSS
The border-right-color property sets the color of an element's right border. It works independently of other border properties and allows you to customize just the right border color while leaving other borders unchanged. Syntax border-right-color: color | transparent | inherit; Values color - Any valid CSS color (hex, RGB, HSL, color names) transparent - Makes the border transparent inherit - Inherits the color from parent element Example: Basic Usage .demo { ...
Read MoreHow to add an element to a JavaScript object?
In JavaScript, objects are real-time entities that contain properties and methods. Objects store data in key-value pairs, where keys are called properties and values are called property values. There are multiple ways to add new properties to existing JavaScript objects. Let's explore the most common approaches. Object Creation Syntax var obj = new Object(); Or using object literal syntax: var obj = {property1: value1, property2: value2}; Using Dot (.) Operator The dot operator is the most common way to add properties to JavaScript objects. It acts as a connector ...
Read MoreAdd a property to a JavaScript object constructor?
In this article, we'll go over how to add properties to a JavaScript object constructor with appropriate examples. Adding a property to an object constructor is different from adding a property to a normal object. Properties must be added inside the constructor function itself, not outside. This ensures all instances created from the constructor have access to these properties. To get a better understanding, let's look at the syntax and usage of constructors in JavaScript. Syntax The syntax for a constructor is: function Constructor() { // No parameters } ...
Read MoreHow to sort an HTML list using JavaScript?
Sorting an HTML list with JavaScript involves manipulating the DOM elements to reorder list items based on their content. Here are two effective approaches to accomplish this. Method 1: Using Array Methods (Recommended) This modern approach converts list items to an array, sorts them, and rebuilds the list: Sort HTML List Animal List Sorting Sort Alphabetically Zebra Elephant ...
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