It is mostly used in the variable array where there is more than 1 value is expected. The cloning is always shallow. The spread operator is a feature of JavaScript introduced with ES6 that gives you access to the insides of an iterable object. With rest parameters we were able to get a list of arguments into an array. In this article, we'll talk about the spread operator… Using Slice. JavaScript & The spread operator. The spread operator is much more powerful then it seems in this situation. This is yet another popular way to copy an array in Javascript. Specifically: arrays, objects literals, and strings. JavaScript Spread Operator. The spread operator allows us to expand elements. Code language: JavaScript (javascript) Summary. Copy. This is the spread operator, and it essentially takes either an array or an object and expands it into its set of items. It makes it easy to copy iterable objects, add items to a new iterable, and pass arguments to a function. Object spread operator can be used to clone an object or merge objects into one. This tutorial will help you understand it. The term “iterable object” is really just a computer science-y term for a category of data types. The spread syntax allows us to spread an array or any iterable to be expanded across zero or more arguments in a function call. The spread operator (…) spreads the elements of an iterable like array or string in Javascript. With a major update in ES9, the spread operator is now extended to objects in addition to arrays. Some scenarios where this capability is useful include: Adding array elements to an existing array JavaScript spread operator is one of the more popular features that were introduced in ES6. The spread operator allows an expression to be expanded in places where multiple elements/variables/arguments are expected. The spread operator is widely used throughout JavaScript. The syntax for the spread operator is three dots, followed by the iterable object which you want to access. Spread operators. When merging objects, the spread operator defines new properties while the Object.assign() assigns them. Object spread operator (...) unpacks the own enumerable properties of an object. JavaScript ECMAScript 6 introduced the spread operator. This is the most succinct and immutable way that I've found. The core piece to know is the ... syntax. Following is the code for spread operator in function calls in JavaScript − There are two features in particular that I'll be covering in this post: spread operator; rest parameter; Spread Operator. Spread Operators for Arrays. spread operators however, let us unpack elements in an array to single/individual arguments. The spread operator is simply three dots and it is … The operator’s shape … The spread operator came out in ES6 and has great functionality for arrays in JavaScript. 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