In web applications you may accept user inputs. The users fill out forms and submit them to send the values to your backend. Receiving data on your server usually comes with data validations. The validation steps could require a string value of a given length for a field. In other …

In some situations, it’s useful to ensure an ending character on a string value. For example, you always want route paths in your web application to end with a trailing slash. Or you want to ensure a base URL for API requests already has a trailing slash before appending …

Building a client-side API client comes with some challenges when composing the request’s URL. You typically store a base URL that may come with a trailing slash. The partial request’s URL may start with a leading slash as well. If this happens, you should’t concatenate both strings …

When working with strings you may want to trim off characters from the start of the value. For example, when composing a request URL you may combine a base URL with an endpoint URL. You want to make sure you’re not ending the base URL with a trailing and …

Developing applications usually comes with date and timestamp manipulations. You may let users interact with dates or times, like setting a task to be „due in 15 minutes“ or „remind me of X in 30 minutes“. JavaScript comes with a native Date type allowing you to manipulate dates. This tutorial …

Working with dates is a common task in application development. You may provide ways to adjust dates and timestamps in your app. One of these tasks may be adding hours to a date in JavaScript. For example, you may allow users to tell your app to „remind me in 1 …

Sometimes you want to show a visual hint to users when a due date comes up. Like, “please notice that your task is due tomorrow”. From a developers perspective you need to compare the task’s due date against the date of tomorrow. This tutorial shows you how to detect …

Modern applications show lots of useful information right in the user interface. For example, you as a user want to see if something is due today and be notified about the event. As a developer you need to make sure you’re showing the right items for today. That’s …