The JavaScript stdlib is missing a method to detect whether a given input is a string value in lowercase format. Yet, we can build our own isLowerCase method using the existing methods. This tutorial shows you how to create a method detecting whether an input is in lowercase. {{outline}} Determine …

JavaScript is missing a method to detect whether a given input is a string value in uppercase format. What’s existing are methods allowing us to create our own isUpperCase utility method. This tutorial shows you how to create a method detecting whether an input is in uppercase. {{outline}} Determine …

JavaScript contains the global Symbol object allowing you to create unique symbol values. You may use symbols to add a property to an object that doesn’t collide with other keys because symbols are hidden from the usual access patterns. This tutorial shows you how to detect whether a given …

A JavaScript object contains key-value pairs. Depending on your use case you may need to iterate through all these key-value pairs. JavaScript offers different types of loops to iterate through the object. The allrounder is the for…in loop. Since ECMAScript 2015 you can use Object.keys. Starting from ECMAScript …

JavaScript’s stdlib for strings contains dozens of methods. These methods are useful in a lot of situations. Yet, there are use cases where a method doesn’t exist in the stdlib. For situations where you want to retrieve the part of a string after the last occurrence of a …

JavaScript’s stdlib for strings comes with a solid foundation. It provides useful methods for common use cases. It can’t provide methods for every use case. Yet, you can build your own utility methods using the existing functionality. This tutorial shows you how to retrieve the part of a …

JavaScript’s stdlib for strings contains dozens of methods. These methods are useful in a lot of situations. Yet, there are use cases where a method doesn’t exist in the stdlib. For example, there’s no method to retrieve a part of a string after a character or character …

JavaScript’s stdlib for strings contains a solid foundation. It provides a lot of useful methods. It can’t provide methods for every use case. Yet, you can surely build your own utility methods using the existing functionality. This tutorial shows you how to retrieve the part of a string …