[karol]

By using `self` you shadow a global variable which is a reference to the current context (window object) in which the code is executed.

[lexicality]

Which should be accessed by window.self anyway so it doesn't really matter? There are so many poorly named global variables (top etc) that worrying about shadowing them seems meaningless.

[amorgaut]

It matters when you are running in workers in which case the window object does not exists

[imdsm]

I always found context, i.e. let context = this, to be far more descriptive.