In this tutorial, we will learn to create an id using mongoose in JavaScript. Users can use the Mongoose NPM package in NodeJS to use MongoDB with NodeJS or connect MongoDB with the application. While storing the data in the MongoDB database, we must add a unique id to every data collection. However, if we don’t add an id, it generates automatically and adds to the data. Syntax Users can follow the syntax below to create an id using mongoose in JavaScript. var newId = new mongoose.mongo.ObjectId(); In the above syntax, we access the ‘mongo’ from the mongoose and ... Read More

We can get the union of two arrays by merging both arrays and removing duplicate elements, and the union gives unique elements from both arrays. In this tutorial, we will learn to compute the union of JavaScript arrays using various approaches. Use the set() Data Structure The first approach is using the set() data structure. The set data structure can contain only unique elements. We can add all elements of both arrays into the set and create a new array from the set’s elements to create a union. Syntax Users can follow the syntax below to compute the union of ... Read More

Sometimes, it requires finding the total time elapsed while performing some operations in JavaScript. For example, we require to find the total time elapsed from users who have updated their profiles. Also, there can be other similar use cases where we need to find the difference between the particular time and the current time, finding the total time elapsed. Here, we will learn various approaches to finding the time elapsed in JavaScript. Using the Date() Object to find the time Elapsed in JavaScript In JavaScript, we can get the current time using the Date() object constructor. It returns the total ... Read More

In JavaScript, we can use the ‘&&’ operator to perform the AND operation between two elements and the ‘||’ operator to perform OR operation between two elements. Here, we will learn to perform OR and AND operations between every element of the array. Use the for Loop We can use the for loop to iterate through the array elements a nd do an OR operation of the array element with the resultant elements. Syntax Users can follow the syntax below to use the for loop to take OR or AND operation of every element. for () { ... Read More

The regex literals are regular expressions, a sequence of characters to match the strings. Sometimes, developers require to combine regular expressions. However, a regular expression is also one type of string, but we can’t concat them like a string using the ‘+’ operator. So, we first require to get flags from both regular expressions. After that, we must filter all unique flags and create a new Regex after combining multiple Regex literals. Syntax Users can follow the syntax below to concatenate regex literals in JavaScript. let allFlags = regex1.flags + regex2.flags; let uniqueFlags = new Set(allFlags.split('')); allFlags = [...uniqueFlags].join(''); let ... Read More

Sometimes, the task is change the page themes and to use different CSS files on the same page content. In such tasks the need is to fetch a CSS and load it dynamically while selecting a theme. In this case the CSS file has to be accessed, loaded and even selected through a javascript program. Using HTML and javascript code this process of loading the CSS file is demonstrated in this article. This is shown by using two different examples. In the first example, a CSS file is selected on the windows load event. In the second example, two buttons ... Read More

What is Send Axios Delete? Deleting data from a backend using ReactJS and Axios can be a challenging task. However, with the right approach and knowledge, you can easily achieve this task. In this article, we'll explore how to send an Axios delete request to the backend in ReactJS using JavaScript. We'll cover two different approaches with code and explanations, as well as two working examples. So, let's dive in! Algorithm To commence our discourse, it is of utmost importance to apprehend the procedure for transmitting an Axios obliteration entreaty to the back end when utilizing ReactJS. Here are the ... Read More

In the current digital terrain, the act of making HTTP requests is a vital component in transmitting and receiving data between the client and server. Asynchronous requests have gained prevalence as they provide a non-blocking experience, which ultimately enhances the overall user experience. Nevertheless, there are certain situations where synchronous HTTP requests may prove necessary or preferable. In the ensuing narrative, we shall delve into the algorithm for creating synchronous HTTP requests using JavaScript. We will also explore two distinct approaches with their corresponding code explanations and practical applications. Algorithm To initiate synchronous HTTP requests in JavaScript, one must execute ... Read More

Dividing an integer is a mathematical operation where we divide a number into two parts, the quotient, and the remainder. In JavaScript, we use this operation to perform various calculations and to get the desired result. In this article, we will discuss how to find the quotient and remainder by dividing an integer in JavaScript. Algorithm The algorithm for dividing an integer in JavaScript is straightforward. We divide the number into two parts, the quotient, and the remainder. The quotient is the result of the division, and the remainder is the part of the number that is left over after ... Read More

It's always important to know when the 1st January falls on a Sunday in a range of years. This information can be used for various purposes, such as scheduling events, managing projects, and more. The purpose of this article is to help you find the 1st January falling on Sunday in a range of years in JavaScript. Algorithm The algorithm to find the 1st January falling on Sunday between a range of years involves several steps. The first step is to calculate the number of days between the current year and the year you want to find the 1st January ... Read More