JavaScript & The spread operator. Spread operator allows an inerrable to expand in places where 0+ arguments are expected. This is the most succinct and immutable way that I've found. Object spread operator can be used to clone an object or merge objects into one. You will learn what spread operator is and how it works. Spread Operators for Arrays. Boring stuff out of the way, let’s look at a bunch of examples to better understand what in the heck the spread operator … The spread operator is widely used throughout JavaScript. There are two features in particular that I'll be covering in this post: spread operator; rest parameter; Spread Operator. With a major update in ES9, the spread operator is now extended to objects in addition to arrays. The term “iterable object” is really just a computer science-y term for a category of data types. Spread operators. JavaScript ECMAScript 6 introduced the spread operator. 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 came out in ES6 and has great functionality for arrays in JavaScript. 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 cloning is always shallow. Specifically: arrays, objects literals, and strings. Code language: JavaScript (javascript) Summary. This is the spread operator, and it essentially takes either an array or an object and expands it into its set of items. This is yet another popular way to copy an array in Javascript. Using Slice. The operator’s shape … With rest parameters we were able to get a list of arguments into an array. It is mostly used in the variable array where there is more than 1 value is expected. You will also learn how to use it to copy and merge arrays and object literals, insert data and more. spread operators however, let us unpack elements in an array to single/individual arguments. The syntax for the spread operator is three dots, followed by the iterable object which you want to access. The spread operator is much more powerful then it seems in this situation. The spread operator allows us to expand elements. Copy. This tutorial will help you understand it. 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. When merging objects, the spread operator defines new properties while the Object.assign() assigns them. In this article, we'll talk about the spread operator… The spread operator is simply three dots and it is … With the introduction of ES6, Javascript developers gained a handful of features. 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