A Bar Chart | D3 .. Feedback Please

Hi all.
I just finished my Bar Chart project. Any feedback would be nice.

Here is a link to codepen

I would appreciate any feedback.
Thanks in advance

It s working in mozilla not in edge , un less you can get else statement if data are not loaded, req.json({sorry:‘sorry’})

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Thanks, I’ve created onerror function
when I test it on IE, an error refers to the arrow functions I use.
should I remove arrow functions?