Arrays are a commonly used data structure in JavaScript applications. Arrays represent a list of items that you can manipulate to your own needs. You can add new items to an existing array with ease. This tutorial shows you three ways of appending new items to the end of an …

Arrays are a commonly used data structure in JavaScript. When interacting with arrays, you likely want to manipulate them by adding new items. In some situations, you may want to add items to the beginning of an array. This tutorial shows you three ways on how to prepend items to …

Interacting with data from third-party sources like APIs comes with challenges. You’re not in control of the data format and style. Sometimes, you wish to transform the data to your preferred style. This tutorial shows you how to transform the keys of an object into camelCase format. {{outline}} CamelCase …

When working with strings in JavaScript, you may want to check if a given string contains all values from a list of candidates. JavaScript comes with a String#includes(needle) determining whether the string contains the given needle. You can combine the existing method with array methods to check whether …

When working with arrays in JavaScript, a typical task is to determine whether a given values exists in the array. For example, you may want to ensure that a list of objects contains only items with unique names. This tutorial shows you how to determine whether a JavaScript array includes …

Coding for the happy path is pretty simple. Handling the rest is a much harder challenge. A typical example is a check for the existence of some data, like is the client sending valid data or just an empty object? This tutorial shows you how to detect if an object …

JavaScript comes with handy string methods. What’s missing though is a handy method determining whether a given value is of type “String”. Nonetheless, JavaScript provides methods helping you to detect if a given value is a string value. {{outline}} Check if a Value is a String in JavaScript A …

JavaScript comes with handy string methods. It provides useful basics to interact with strings. The standard library has some missing pieces which you can fill yourself by composing helpful utility methods. One of these utilities is a function retrieve the part after a given character in a JavaScript string. This …