Wow, cool feature from DuckDuckGo, it seems to be working well. 
If you want more detailed cheatsheet for ES6 <a href="https:&#x2F;&#x2F;github.com&#x2F;DrkSephy&#x2F;es6-cheatsheet" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;DrkSephy&#x2F;es6-cheatsheet</a> is a good one, I believe.