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JavaScript - convert array with null value to string
In this article, we will learn to convert an array with a null value to a string in Javascript. Handling arrays containing null, undefined, and falsy values in JavaScript is a frequent challenge. The default methods might not behave as expected when converting such arrays to strings, requiring custom solutions for meaningful string representations. Problem Statement Given an array containing null, undefined, empty strings, and other values, the task is to concatenate its elements into a single string while excluding the unwanted values. Following is our array, with some null and undefined values − Input ...
Read MoreFinding the intersection of arrays of strings - JavaScript
We need to find the intersection of two arrays of strings and return an array containing the common elements. Each element in the result should appear as many times as it shows in both arrays. For example − If input is − arr1 = ['hello', 'world', 'how', 'are', 'you']; arr2 = ['hey', 'world', 'can', 'you', 'rotate']; Then the output should be − ['world', 'you'] Approach For unsorted arrays, we need to check every value of the first array against the second array. This approach has O(n²) time complexity. We ...
Read MoreHow to get the port number part of the href attribute of an area in JavaScript?
In this tutorial, we will discover how to get the port number of the href attribute of an area in JavaScript. An area is a tag in JavaScript. This tag is written as . This tag denotes an area inside an image map. This tag has no closing tag. So in HTML, this is an empty tag. In XHTML, this tag must be closed correctly. An image map is also another tag. This tag is written as . An image map contains an image with clickable or active areas. The area tag comes inside the map ...
Read MoreWorking with Inline CSS
Inline CSS allows you to apply styles directly to HTML elements using the style attribute. This method applies styles to individual elements only, making it useful for quick styling or element-specific customizations. Syntax You can use the style attribute on any HTML element to define inline style rules: Style Attribute Attribute Value ...
Read MoreWhat is the use of _.size() method in JavaScript?
The _.size() method is part of the Underscore.js library and returns the number of elements in arrays, objects, and strings. It provides a consistent way to get the size of various data types. Syntax _.size(collection) Parameters collection: The array, object, or string to count elements from. Return Value Returns a number representing the count of elements in the collection. Example 1: Array Size Find the size of a numeric array using _.size(): var arr = [100, 62, 73, 534, 565]; document.write("Array size: ...
Read MoreWhat is the importance of '+' operator in type conversion in JavaScript?
JavaScript is a dynamically typed language where operations often automatically convert values to the appropriate type. The + operator plays a crucial role in type conversion, behaving differently depending on the operand types. JavaScript provides many ways to convert data from one form to another, with two most common types of conversion: Converting values to strings Converting values to numbers The '+' Operator's Dual Behavior The + operator in JavaScript serves two purposes: Addition: When both operands are numbers String ...
Read MoreJavaScript function to take a number n and generate an array with first n prime numbers
We are required to write a JavaScript function that takes in a number n and returns an array that contains first n prime numbers. We know that prime numbers are those numbers that are only divisible by 1 and themselves like 2, 3, 19, 37, 73 etc. Let's understand the problem with an example − Input: n = 6; Output: prime_numbers = [ 2, 3, 5, 7, 11, 13 ] Using Iteration We will first write a function that checks whether a given number is prime or not and then run a loop ...
Read MoreFormatting text to add new lines in JavaScript and form like a table?
To format text with new lines in JavaScript and create table-like output, use the map() method combined with join(''). The '' character creates line breaks in console output. Syntax array.map(element => `formatted string`).join('') Example: Creating a Table-like Format let studentDetails = [ [101, 'John', 'JavaScript'], [102, 'Bob', 'MySQL'], [103, 'Alice', 'Python'] ]; // Create header let tableHeader = '||Id||Name||Subject||'; // Format data rows let tableRows = studentDetails.map(student => `|${student.join('|')}|` ).join(''); // Combine header ...
Read MoreDividing an array – JavaScript
Let's say, we are required to write a function that takes in an array arr of string / number literals as the first argument and a number n as second argument. We are required to return an array of n subarrays, each of which contains at most arr.length / n elements. And the distribution of elements should be like this − The first element goes in the first subarray, second in second, third in third and so on. Once we have one element in each subarray, we again start ...
Read MoreHow to convert seconds to HH-MM-SS with JavaScript?
In this tutorial, we will learn to convert seconds to Hours, Minutes, and Seconds (HH:MM:SS) format in JavaScript. Converting seconds to a readable time format is essential for displaying durations, timers, or elapsed time in web applications. JavaScript provides several approaches to achieve this conversion. Using the toISOString() Method The toISOString() method is one of the simplest approaches to convert seconds into the standard HH:MM:SS format. This method creates a Date object and extracts the time portion. Syntax var calculatedTime = new Date(null); calculatedTime.setSeconds(seconds); var newTime = calculatedTime.toISOString().substr(11, 8); Example The ...
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