You will also learn how to use it to copy and merge arrays and object literals, insert data and more. There are two features in particular that I'll be covering in this post: spread operator; rest parameter; Spread Operator. The operator’s shape … JavaScript spread operator is one of the more popular features that were introduced in ES6. Using Slice. You will learn what spread operator is and how it works. This tutorial will help you understand it. It makes it easy to copy iterable objects, add items to a new iterable, and pass arguments to a function. JavaScript ECMAScript 6 introduced the spread operator. It is mostly used in the variable array where there is more than 1 value is expected. The cloning is always shallow. This is the spread operator, and it essentially takes either an array or an object and expands it into its set of items. The spread operator is simply three dots and it is … Some scenarios where this capability is useful include: Adding array elements to an existing array Copy. 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 is widely used throughout JavaScript. This is yet another popular way to copy an array in Javascript. With a major update in ES9, the spread operator is now extended to objects in addition to arrays. In this article, we'll talk about the spread operator… With the introduction of ES6, Javascript developers gained a handful of features. With rest parameters we were able to get a list of arguments into an array. The core piece to know is the ... syntax. The spread operator allows us to expand elements. Code language: JavaScript (javascript) Summary. Object spread operator can be used to clone an object or merge objects into one. The syntax for the spread operator is three dots, followed by the iterable object which you want to access. The spread operator allows an expression to be expanded in places where multiple elements/variables/arguments are expected. Following is the code for spread operator in function calls in JavaScript − Spread operator allows an inerrable to expand in places where 0+ arguments are expected. JavaScript Spread Operator. Spread operators. When merging objects, the spread operator defines new properties while the Object.assign() assigns them. JavaScript & The spread operator. 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 came out in ES6 and has great functionality for arrays in JavaScript. The term “iterable object” is really just a computer science-y term for a category of data types. 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