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Re:Javascript Arrays and Functional Programming by sleazybae on Thursday August 03, 2017 @11:10AM (#14920242)
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
Re:Javascript Arrays and Functional Programming by dave7 on Thursday August 03, 2017 @04:45PM (#14923704)
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.