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Re: Why aren't `find`, `find-if`, `remove-if` part of Emacs Lisp?

From: Nicolas Petton
Subject: Re: Why aren't `find`, `find-if`, `remove-if` part of Emacs Lisp?
Date: Tue, 17 Jun 2014 20:36:31 +0200
User-agent: mu4e; emacs 24.3.1

Stefan Monnier writes:

>> Emacs Lisp is a great Lisp dialect, but I miss `find`, `find-if`,
>> `remove-if`, etc. iteration functions a lot. Sure, I can require cl-lib
>> or use dash, but I'm wondering why these functions are not part of the
>> base language?
> Not sure what you mean.  Most languages I know provide list operations
> via libraries.  Why should Elisp be different?

What I mean is that Elisp do not have `remove-if` (or any equivalent
function, I don't necessarily mean the CL remove-if function), a
function that I think could be in the language.

To filter lists, one has to implement its own version of this function,
or require an external library. Same goes for `find-if`. 

I was wondering if Emacs Lisp was lacking this function for some reason
(or did I completely miss it? could be too). If not, why not add it to
the language? It looks to me like a badly missing feature, I think
filtering collections is something very common.


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