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Articles on Trending Technologies
Technical articles with clear explanations and examples
Getting elements of an array depending on corresponding values of another JavaScript
Suppose we have two arrays, for example consider the following two: const array1 = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']; const array2 = [ 1, 0, 0, 1 , 0, 0, 1, 0]; Both arrays are bound to have the same length. We need to write a function that, when provided with an element from the second array, returns a subarray from the first array containing all elements whose index corresponds to the index of the element we took as an argument in the second array. For example: findSubArray(0) should return: ...
Read MoreaddEventListener() not working more than once with a button in JavaScript?
The addEventListener() method works multiple times by design. If it seems to work only once, the issue is usually in your event handler function or how you're setting up the listener. Common Problem: Removing the Element A frequent mistake is removing or replacing the button element inside the event handler, which destroys the event listener: addEventListener Problem Bad Example - Works Once ...
Read MoreHow to divide an unknown integer into a given number of even parts using JavaScript?
When dividing an integer into equal parts, you may need to distribute the remainder across some parts to ensure all values are used. This can be achieved using the modular operator and array manipulation. How It Works The algorithm divides the integer by the number of parts to get a base value. If there's a remainder, it distributes the extra values by adding 1 to some parts. Example function divideInteger(value, parts) { var baseValue; var remainder = value % parts; ...
Read MoreCasting a string to snake case - JavaScript
Snake case is a naming convention where words are separated by underscores (_) and all letters are lowercase. For example, "Hello World" becomes "hello_world". This article demonstrates how to convert any string to snake case using JavaScript. Syntax function toSnakeCase(str) { return str.split(' ') .map(word => word.toLowerCase()) .join('_'); } Example Here's a complete example that converts a sentence to snake case: ...
Read MoreHow to deal with floating point number precision in JavaScript?
Floating point precision issues occur when JavaScript cannot exactly represent certain decimal numbers in binary format. Common problems include 0.1 + 0.2 = 0.30000000000000004. JavaScript provides several methods to handle these precision issues. The Floating Point Problem JavaScript uses IEEE 754 double-precision floating-point format, which can cause unexpected results: console.log(0.1 + 0.2); // 0.30000000000000004 console.log(0.1 + 0.2 === 0.3); // false ...
Read MoreHow to find the text visible on the button with JavaScript?
In this tutorial, we will discuss different approaches to find the text visible on the button with JavaScript. The text on a button shows what will happen if you click the button. To extract the text on the button, JavaScript provides us with the following two properties. Using the innerHTML Property Using the innerText Property Let us discuss both of the above properties in detail. Using the innerHTML Property The innerHTML property not only allows us to get the text inside any tag but also allows us to set the text ...
Read MoreWhat is the best JavaScript code to create an img element?
Creating an image element in JavaScript can be done in several ways. The most common approach is using document.createElement() or the Image() constructor. Using document.createElement() The standard DOM method to create an image element: Create Image Element // Create image element var myImg = document.createElement('img'); myImg.src = 'https://via.placeholder.com/150x100'; ...
Read MoreEnable rear camera with HTML5
To enable the rear camera in HTML5, you need to access the device's camera sources and specify which camera to use. This is particularly useful on mobile devices that have both front and rear cameras. Getting Available Camera Sources First, use the MediaDevices.enumerateDevices() method to get all available media devices: Rear Camera Access Start Rear Camera async function getRearCamera() { ...
Read MoreUsage of border-style property in CSS
The border-style property in CSS defines the style of an element's border. It controls how the border appears visually, such as solid, dashed, dotted, or hidden. Syntax border-style: value; Common Border Style Values Value Description none No border (default) solid Solid single line dashed Dashed line dotted Dotted line double Double solid lines groove 3D grooved effect ridge 3D ridged effect inset 3D inset effect outset 3D outset effect Basic Example ...
Read MoreAdding an element at the end of the array in Javascript
In JavaScript, adding elements to the end of an array is a fundamental operation. The most common and efficient method is using the push() method, which modifies the original array by appending one or more elements. An array is a special variable that can hold multiple values in a single ordered collection. Arrays in JavaScript are dynamic, meaning you can add or remove elements after creation. What is an Array? An array is a collection of items stored at contiguous memory locations. Arrays allow random access to elements, making it faster to access elements by their position ...
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