Working with string values comes with some typical problems. One of them is to add a prefix to an existing string. For example, you might compose a URL and want a given URL path with a leading forward slash in case it’s not present on the current value. This …

Working with strings you’re running into typical use-cases. One of them is to append characters or words to an existing string. For example, you may want to check whether a view template file exists on your local hard disk. For that check you need the filename with extension. Your …

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 …