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Articles on Trending Technologies
Technical articles with clear explanations and examples
HTML5 preload attribute
The HTML5 preload attribute controls how much video or audio content should be loaded when the page loads, before the user plays the media. This helps optimize page loading performance and user experience. Syntax Preload Values Value Behavior Use Case none No data is loaded until user plays Save bandwidth, slow connections metadata Only duration, dimensions loaded Show video info without full download auto Entire media file is downloaded Media likely to be played immediately Example: No Preload ...
Read MoreThe Set Class in Javascript
JavaScript's built-in Set class is a collection of unique values that allows you to store distinct elements of any type. Unlike arrays, Sets automatically prevent duplicate values and provide efficient methods for adding, removing, and checking element existence. Creating a Set You can create a Set using the new Set() constructor, optionally passing an iterable like an array: // Empty set let mySet = new Set(); // Set from array let numbersSet = new Set([1, 2, 3, 4, 4, 5]); console.log(numbersSet); // Duplicates are automatically removed let wordsSet = new Set(['hello', 'world', 'hello']); console.log(wordsSet); ...
Read MoreWeekday as a number in JavaScript?
In JavaScript, the getDay() method from the Date object returns the weekday as a number from 0 to 6, where Sunday is 0, Monday is 1, and so on. Syntax dateObject.getDay() The method returns an integer representing the day of the week: 0 = Sunday 1 = Monday 2 = Tuesday 3 = Wednesday 4 = Thursday 5 = Friday 6 = Saturday Example 1: Current Date Weekday Get the ...
Read MoreGet global variable dynamically by name string in JavaScript?
In JavaScript, you can access global variables dynamically using their name as a string through the window object (in browsers) or global object (in Node.js). Syntax // Browser environment window[variableName] // Node.js environment global[variableName] // Using globalThis (works in both) globalThis[variableName] Basic Example Dynamic Global Variables // Define global variables ...
Read MoreExplain 'Not a constructor function' error in JavaScript?
The "Not a constructor function" error occurs when we try to use the new keyword with a value that isn't a constructor function. This TypeError is thrown when JavaScript expects a constructor but receives a primitive value, object, or non-constructor function. What Causes This Error The error occurs when we attempt to instantiate something that cannot be used as a constructor: Primitive values (numbers, strings, booleans) Regular objects Arrow functions (in strict mode) Built-in methods that aren't constructors Example: Using Primitive as Constructor Constructor Error Demo ...
Read MoreHow to turn words into whole numbers JavaScript?
We need to write a function that takes a string of number words as input and converts them into their equivalent whole number. Problem Overview Given a string containing number words separated by spaces, we want to convert each word to its corresponding digit and combine them into a single number. "one five seven eight" -------> 1578 "two eight eight eight" -------> 2888 Approach The solution involves creating a mapping of number words to digits, then iterating through each word to build the final number. We split the input string by whitespace ...
Read MoreCounting the number of redundant characters in a string - JavaScript
We are required to write a JavaScript function that takes in a string and returns the count of redundant characters in the string. A redundant character is any character that appears more than once, where all duplicate occurrences (except the last one) are considered redundant. For example − If the string is − const str = 'abcde' Then the output should be 0 because each character appears only once. If the string is − const str = 'aaacbfsc'; Then the output should be 3 because 'a' appears 3 times (2 ...
Read MoreCheck if a string is sorted in JavaScript
We are required to write a JavaScript function that takes in a string and checks whether it is sorted or not. A string is considered sorted if its characters are arranged in either ascending or descending order. For example: isSorted('adefgjmxz') // true (ascending) isSorted('zxmfdba') // true (descending) isSorted('dsfdsfva') // false (mixed order) Method 1: Character by Character Comparison This approach compares adjacent characters and tracks whether the string is ascending or descending: const str = 'abdfhlmxz'; const findDiff = (a, b) => a.charCodeAt(0) - b.charCodeAt(0); ...
Read MoreHow to append an item into a JavaScript array?
To append an item to a JavaScript array, you can use several methods. The most common approach is the push() method, which adds elements to the end of an array. Using push() Method The push() method adds one or more elements to the end of an array and returns the new length: var arr = ["marketing", "technical", "finance", "sales"]; arr.push("HR"); ...
Read MoreWhat is function overloading in JavaScript?
JavaScript does not support function overloading like other programming languages such as Java or C++. When you define multiple functions with the same name, JavaScript keeps only the last defined function. What Happens with Same Function Names Let's see what happens when we define multiple functions with the same name: function funcONE(x, y) { return x * y; } function funcONE(z) { return z; } // Only the last function definition is kept console.log(funcONE(5)); // prints 5 console.log(funcONE(5, 6)); // prints ...
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