Sometimes you need to break out of a loop in JavaScript. For example, you may want to stop iterating through an array of items as soon as you find a specific element. TL;DR: use break to exit a loop in JavaScript. This tutorial shows you how to terminate the …

Sometimes you want to ensure a given value is actually a string. For example, you may want to confirm a name property to be a string value. This tutorial shows you how to detect whether a given value is a string in JavaScript. {{outline}} Determine If a Given Value Is …

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 …