February 2018
Intermediate to advanced
298 pages
8h 22m
English
Content preview from Learn ECMAScript - Second Edition
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The spread operator
A spread operator is represented by the ... token. A spread operator splits an iterable object into its individual values.
An iterable is an object that contains a group of values and implements the ES6 iterable protocol to let us iterate through its values. An array is an example of a built-in iterable object.
A spread operator can be placed wherever multiple function arguments or multiple elements (for array literals) are expected in code.
The spread operator is commonly used to spread the values of an iterable object into the arguments of a function. Let's take the example of an array and see how to split it into the arguments of a function.
To provide the values of an array as a function argument, you can use the ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.