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It's 2018. Unless you're using Internet Explorer arrow functions are supported natively.

And I bet there are some people here using IE. And old browsers.

I would REALLY love to see the browser usage statistics for HN :)

Well.. I might be an outlier, I use OmniWeb and Camino as they give the best results with my 2005 Mac. So I'm still living in the Pre-=> Age.