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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 More
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 More
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 More
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 More
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 More
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 More
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 More
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 ... Read More
In this tutorial, we will learn to check whether a value is a safe integer or not in JavaScript. A safe integer in JavaScript is any number that can be accurately represented under the IEEE-754 double-precision format. Safe integers are all numbers between -(2^53 - 1) and (2^53 - 1) inclusive. JavaScript provides a built-in method for this check, but we can also implement custom logic. Here are the approaches we'll explore: Using the Number.isSafeInteger() Method (Recommended) Using Custom if-else Logic Using Number.isSafeInteger() Method The Number.isSafeInteger() ... Read More
In this tutorial, we shall learn to set the width of the bottom border with JavaScript. To set the width of the bottom border, we can use the borderBottomWidth property in JavaScript. It allows you to change the width. Let us discuss our topic in brief. Using the borderBottomWidth Property With this property, we can set or return the width of an element's bottom border. Width is a floating point number with either a relative units designator (cm, mm, in, pt, or pc) or an absolute units designator (em, ex, or px). Syntax Following is ... Read More