Node.js can use a Date object that provides information about a timestamp. This object can be used for various purposes such as getting the current time, comparing dates, formatting dates, reminders, etc. Date objects represent a specific point in time…
MongoDB aggregation allows developers to perform complex operations while working with data stored inside a collection of a MongoDB database. One of the operations is the “group by” operation, i.e. $group, which is used to group documents based on the…
When developing web applications, we don’t actually build everything from scratch. We may sometimes want to “outsource” certain tasks. For this, we can use APIs from other websites that offer services that we want to integrate into our application without…
A MongoDB cluster is used to denote a replica set of a collection of datasets distributed across multiple servers to speed up the overall processing during read and write operations. In this tutorial, we will learn about clusters in MongoDB,…
In this tutorial, we will learn about sharding in MongoDB. It is time we learn an intermediate-level topic. Sharding in MongoDB is one such topic. Now, sharding in layman’s terms means that mechanism that stores data on multiple machines. This…
In this article, I will explain how to solve transaction errors in Solidity. This guide aims to provide examples of how to solve transaction errors in Solidity. So, let us get this guide started. The Transaction Error in Solidity A…
In this tutorial, I will teach you how to perform error testing for your smart contract in Solidity. Error testing is a crucial aspect of development especially when it comes to blockchain development. Unlike development using other technologies, blockchain technology…
To find records where the array field is not empty, you can use the $ne operator. The $ne operator in MongoDB stands for “not equal”. It is a type of comparison operator used to query for documents where the value…
A MongoDB database has multiple collections. These collections can store millions of documents(data in MongoDB is called a document). MongoDB has various methods to fetch the documents from a collection such as find(), findOne(), findOneAndUpdate(), etc. We already have covered…
In today’s tutorial, I am covering the $nor operator in MongoDB. The $nor applies a logical NOR operation to an array of one or more query expressions and selects the documents that fail all of the query expressions in the…