Create a shallow copy using the spread operatorĬonsole.log(personCopy.hobbies) // Ĭonsole.log(person.hobbies) // Īs you can see, the spread operator makes a copy of an object and its properties however, it doesn't create a copy of nested arrays within the object. The spread operator copies all enumerable properties of an object or an array into a new one. One common way to create a shallow copy of an object or an array in JavaScript is to use the spread operator ( …). Reversely, if you change the shallow copy, the original object or array will also be affected.Ī shallow copy does not clone nested objects, meaning that if the original object contains other objects or arrays as properties, the shallow copy will point to the same references as the original. Therefore, if you change the original object or array. When you make a shallow copy of an object or array, you create a new one that points to the same values as the original. JavaScript provides multiple ways to create shallow copies of objects and arrays. So, let's dive in! Shallow Copy in JavaScript We'll also discuss the benefits and limitations of each approach and provide you with best practices to help you avoid common pitfalls.īy the end of this post, you'll better understand how to use the shallow and deep copy in your code effectively. In this article, we'll explore the differences between shallow and deep copy in JavaScript and when to use each technique. Two main techniques for copying in JavaScript are shallow copy and deep copy.

As a JavaScript developer, you must be familiar with the concept of copying, which is the process of creating a new object or array with the same values as an existing one.Ĭopying is an essential technique in programming that helps you to avoid unexpected mutations to objects and arrays.

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