[sleazybae]

this post introduced me to the arrow function ((https://stackoverflow.com/questions/24900875)), which i'd previously not heard of. evidently it was introduced in ECMAscript 6 but for engines that use JavaScript and older browsers (amazingly, they still exist) it won't work

[dave7]

There is a spurious ) ending your link, resulting in page not found error.

For those using arrow functions these days for web, most will use Babel in the build process to provide compatibility with older platforms.