Get the difference of arrays in ES6?
<p>So I have two arrays:</p>

<pre><code>const allLanguages = [ 'ES', 'EN', 'DE' ]
const usedLanguages = [ { id: 1, lang: 'EN' } ]
</code></pre>

<p>What's the quickest way to produce a new array which is the difference between these two? In old school JavaScript, you'd have to do a for loop inside another for loop, I think...</p>

<p>Eg:</p>

<pre><code>const availableLanguages = [ 'ES', 'DE' ]
</code></pre>