This is the spread operator, and it essentially takes either an array or an object and expands it into its set of items. There are two features in particular that I'll be covering in this post: spread operator; rest parameter; Spread Operator. The term “iterable object” is really just a computer science-y term for a category of data types. The cloning is always shallow. JavaScript & The spread operator. Spread operator allows an inerrable to expand in places where 0+ arguments are expected. With rest parameters we were able to get a list of arguments into an array. This is yet another popular way to copy an array in Javascript. The syntax for the spread operator is three dots, followed by the iterable object which you want to access. spread operators however, let us unpack elements in an array to single/individual arguments. It is mostly used in the variable array where there is more than 1 value is expected. The spread operator is much more powerful then it seems in this situation. Some scenarios where this capability is useful include: Adding array elements to an existing array The spread operator is widely used throughout JavaScript. You will learn what spread operator is and how it works. Using Slice. Object spread operator can be used to clone an object or merge objects into one. The spread operator is simply three dots and it is … JavaScript Spread Operator. The core piece to know is the ... syntax. The operator’s shape … With a major update in ES9, the spread operator is now extended to objects in addition to arrays. This tutorial will help you understand it. The spread operator is a feature of JavaScript introduced with ES6 that gives you access to the insides of an iterable object. The spread operator allows an expression to be expanded in places where multiple elements/variables/arguments are expected. In this article, we'll talk about the spread operator… Code language: JavaScript (javascript) Summary. Spread Operators for Arrays. Object spread operator (...) unpacks the own enumerable properties of an object. This is the most succinct and immutable way that I've found. You will also learn how to use it to copy and merge arrays and object literals, insert data and more. The spread operator allows us to expand elements. Specifically: arrays, objects literals, and strings. The spread syntax allows us to spread an array or any iterable to be expanded across zero or more arguments in a function call. JavaScript spread operator is one of the more popular features that were introduced in ES6. When merging objects, the spread operator defines new properties while the Object.assign() assigns them. Copy. Boring stuff out of the way, let’s look at a bunch of examples to better understand what in the heck the spread operator … With the introduction of ES6, Javascript developers gained a handful of features. It makes it easy to copy iterable objects, add items to a new iterable, and pass arguments to a function. 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