Hi Don,
() => {} are called arrow functions
<https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions>and
are (not so) new to ES2015
<https://en.wikipedia.org/wiki/ECMAScript#6th_Edition_-_ECMAScript_2015>
I Updated the example a bit, to show you how you can handle your questions,
and moved it back to ES5
<https://en.wikipedia.org/wiki/ECMAScript#5th_Edition>. I hope it's easier
to understand for you now.
If you still have questions, don't hesitate to ask!
Regards
Sander
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