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Before we begin toying around with the new features in ES6, we must first review basic compilation, using Babel. This way, all browsers will understand the cutting-edge ES6 code you'll soon be writing.
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If you happen to use Laravel as your framework of choice, then you'll be happy to know that, with Laravel Elixir, you don't even have to think about Babel. Everything will just work.
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ES6 introduces two new keywords for declaring variables:
const. The only question is: how do you know which of the three to choose for any given situation? Well, let's talk about it.
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Arrows in ES2015 provide a friendly function shorthand for performing common tasks. While not a complete replacement for the
function keyword, you'll still get an enormous amount of usage out of this new syntax.
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ES5 doesn't offer support for default parameters. So, as a result, we all ended up resorting to less-than-ideal alternatives (like
name = name || 'Joe'). Luckily, with ES6, it'll all just work the way you'd expect. Even better, you're not limited to primitives alone; you can even set the default value equal to the result of a function call!
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ES6 finally introduces support for both the "rest" and "spread" operators. In this lesson, I'll demonstrate what they are, and how you'll use them in your own codebases.
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Template literals allow us to remove all that funky trickery we resorted to for creating elegant multi-line strings. Instead, simply replace those single quotes with backticks, and you're done. Even better, they also support variable substitutions. No more awkward concatenation!
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ES6 includes a wide range of
Object additions. In this episode, we'll review three of my favorites: property shorthand, short methods, and object destructuring.
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ES6 classes are particularly appealing to those of us who predominantly work in traditional server-side languages. With ES5, you'd need to leverage the confusing prototype object to attach methods. But, now, all of that awkward code is pushed behind the scenes. In its place is a more familiar structure that you'll love.
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As we've begun to learn, while modern browsers are implementing much of the ES2015 spec, none of them yet support modules natively. This means we require a module bundler, like Browserify, Webpack, or Rollup. Let's begin with the latter. In this lesson, we'll compile ES2015 code using modules, down to vanilla ES5 code that all relevant browsers understand.
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In the previous lesson, we learned about Rollup. But, now, let's switch over to Webpack, which has a much larger community and plugin ecosystem. We'll set up a Webpack config file, transpile ES2015, and even peek at Laravel Elixir 6.0's seamless Webpack integration.
View the completed setup for this lesson on GitHub.
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Promises can be a bit tricky to understand at first, but maybe this lesson will help! At its core, a promise is nothing more than a stand-in or placeholder for an action that has not yet taken place.
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Nothing here will knock your socks off, but, nonetheless, it's still important that you're aware of the following new additions to the String API:
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ES2015 brings a number of new additions to arrays, however, you'll likely only make use of a few of them. In this episode, we'll review the new
includes methods - with the latter actually being part of ES2017, not ES2015.
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Generators will take some time to wrap your head around. So don't worry if it doesn't immediately click. In this episode, we'll lightly review the basic structure, and what it actually means for a function to be a "generator."
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In ES2015, a
Set is an object that contains a collections of unique values of any type. Whether you simply want a cleaner API for working with this sort of structure, or need to enforce a unique constraint on all items within your collection,
Sets are the way to go.