JavaScript programs started small by being used here and there. Over time, the usage of JavaScript increased and we’re writing full applications that run in the browser. These large applications can be hard to maintain. It makes sense to think about ways of splitting them up into modules. Modern …

Sorting data is an essential task in applications. For example, a list of data in the frontend contains ways to sort the data based on a given column. Also, you might want to sort the data in ascending or descending order. This tutorial shows you how to sort a JavaScript …

Sorting arrays of data is an everyday use case in applications. For example, you want to display a list of names in alphabetical order and allow the user to toggle the sorting from ascending to descending and vice-versa. This tutorial shows you how to sort an array of strings in …

JavaScript uses two representations of „empty“ values. When „empty“ we mean that they don’t have an exact value assigned. These two values are null and undefined. Both values, null and undefined, are valuable in JavaScript. Except when you are not checking for them. In such cases, you’re running …

MongoDB requires each document to contain an _id field. If the _id field is not present when inserting a document, MongoDB generates an ObjectId for you. ObjectIds have a length of 12 bytes: 4-byte timestamp, 5-byte random value, and 3-byte incrementing counter. An ObjectId can be formatted as a hex …

MongoDB requires each document to contain an _id field. If the _id field is not present when inserting a document, MongoDB generates an ObjectId for you. You can use ObjectIds as the primary key in your application. When requesting information from the browser you may send an ObjectId as an …

Sometimes it’s helpful to translate dates into labels in your web application. For example, the human brain perceives the label „yesterday“ easier than translating the string of yesterday’s date to „yesterday“. This tutorial shows you how to calculate yesterday’s date in JavaScript. {{outline}} How Do You Get …

Working with dates in an application typically involves some kind of „shortcuts“. Like, such as adding a given number of days to a date. Adding days to a date could mean postponing a to-do item. This tutorial shows you how to add days to a date in JavaScript. {{outline}} Add …