Re: Why aren't there functions such as filter, take-while, etc. "by default"?

[Stefan Monnier]

>> Why does it have to be so hard to write Emacs Lisp without requiring cl?
>> Why aren't there functions such as filter (the equivalent of
>> remove-if-not in cl-seq.el), take-while, reduce etc. "native" in
>> Emacs?
> They make for no-surprise efficient programs primarily when the language
> has lexical closures.

I do not understand this.  What do you mean to say, and why is dynamic
scoping relevant (i.e. why wouldn't the same argument apply to mapcar,
mapconcat, etc...).


        Stefan