Why compile Haskell to javascript?

Question

JavaScript

Stumbled on ways to compile Haskell to javascript.
They are slower than native js. Why use these things?
PS
I haven't written in Haskell yet, so I probably still don't understand some things.

Answer 1

I don’t know about Haskell in js, but I’ll tell you about the advantages of PureScript over JS:
This is also in Haskell, but I have not tried it for the front-end.
Try Elm and you will feel the beauty of these languages ​​​​(they are similar in general terms)

Answer 2

Coz we CAN

Answer 3

And why javascript on the server, nodejs? For uniformity.