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Articles on Trending Technologies
Technical articles with clear explanations and examples
JavaScript how to get an alert to appear when I click on a button in a class?
An alert in JavaScript is a dialog box that displays important information or warnings to the user. It contains a message with an OK button that dismisses the dialog when clicked. Clicking a button triggers an event handler that invokes a function instructing the browser to display the alert dialog. In this article, we will explore different ways to show an alert when a user clicks on a button in a class. For example, click on the button below to see an alert: .alerttoappear { margin: auto; width: ...
Read MorePrime numbers in a range - JavaScript
We are required to write a JavaScript function that takes in two numbers, say, a and b and returns the total number of prime numbers between a and b (including a and b, if they are prime). For example − If a = 2, and b = 21, the prime numbers between them are 2, 3, 5, 7, 11, 13, 17, 19 And their count is 8. Our function should return 8. Understanding Prime Numbers A prime number is a natural number greater than 1 that has no positive divisors other than 1 ...
Read MoreSumming all the unique values of an array - JavaScript
Let's say, we are required to write a JavaScript function that takes in an array of numbers with duplicate entries and sums all the duplicate entries to one index. For example − If the input array is − const input = [1, 3, 1, 3, 5, 7, 5, 4]; Then the output should be − const output = [2, 6, 10, 7, 4]; That means all the duplicate ones are summed to index 0 (1 + 1 = 2), all the duplicate threes are summed to index 1 (3 + ...
Read MoreHow to create domain-based cookies using JavaScript?
To create a domain-based cookie, set the domain and path attribute on your cookie. Domain-based cookies are accessible across all subdomains of the specified domain. Syntax document.cookie = "cookieName=value; domain=.example.com; path=/"; Domain Cookie Format domain=.example.com The dot prefix (.) makes the cookie available to all subdomains like www.example.com, api.example.com, etc. Example: Setting Domain-Based Cookie function WriteCookie() { if( document.myform.customer.value == "" ...
Read MoreSet whether the table border should be collapsed into a single border or not with JavaScript?
In this tutorial, let us look at how to set whether the table border should collapse into a single table border or not with JavaScript. We can use the borderCollapse property in JavaScript to accomplish this. This property controls how table borders are displayed - either as separate borders for each cell or collapsed into a single unified border. Using the Style borderCollapse Property The borderCollapse property defines whether the table border should collapse into a single table border or separate into a double table border. The value 'separate' is the default. The borderCollapse is a read-and-write ...
Read MoreUsage of font-size property in CSS
The font-size property in CSS controls the size of text elements. It accepts various units and keywords to specify how large or small text should appear on a webpage. Syntax font-size: value; Font Size Values The font-size property accepts several types of values: Absolute keywords: xx-small, x-small, small, medium, large, x-large, xx-large Relative keywords: smaller, larger Length units: pixels (px), em, rem, points (pt) Percentage: relative to parent element's font size Example: Different Font Size Values ...
Read MoreDetermining happy numbers using recursion JavaScript
A happy number is a number which eventually reaches 1 when replaced by the sum of the square of each digit. Whereas if during this process any number gets repeated, the cycle will run infinitely and such numbers are called unhappy numbers. For example − 13 is a happy number because, 1^2 + 3^2 = 10 and, 1^2 + 0^2 = 1 On the other hand, 36 is an unhappy number. We are required to write a function that uses recursion to determine whether or not a number is a happy number. Algorithm ...
Read MoreHow to subtract date from today's date in JavaScript?
To subtract dates in JavaScript, you can work with Date objects directly or extract specific components like day, month, or year. The most common approach is to subtract one Date object from another to get the difference in milliseconds. Syntax var dateDifference = date1 - date2; // Returns difference in milliseconds var daysDifference = Math.floor((date1 - date2) / (1000 * 60 * 60 * 24)); Example 1: Subtracting Full Dates var currentDate = new Date(); var pastDate = new Date("2024-01-01"); // Get difference in milliseconds var timeDifference = currentDate - pastDate; console.log("Difference ...
Read MoreComparing forEach() and reduce() for summing an array of numbers in JavaScript.
When summing arrays in JavaScript, both forEach() and reduce() are common approaches. This article compares their performance to help you choose the right method. Since we can't demonstrate with truly massive arrays here, we'll simulate the performance impact by running the summing operation many times in a loop. The Two Approaches Here's how each method works for summing an array: const arr = [1, 4, 4, 54, 56, 54, 2, 23, 6, 54, 65, 65]; // Using reduce() - functional approach const reduceSum = arr => arr.reduce((acc, val) => acc + val); // ...
Read MoreCode to find the center of an array without using ES6 functions - JavaScript
We are required to write an array function midElement() that returns the middlemost element of the array without accessing its length property and without using any kind of built-in loops. If the array contains an odd number of elements, we return the one middlemost element, or if the array contains an even number of elements, we return an array of two middlemost elements. How It Works The solution uses recursion to count array elements by incrementing an index until reaching undefined, then calculates the middle position(s) based on whether the count is odd or even. Example ...
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