From: Yagnesh Raghava Yakkala <yagnesh@live.com>
To: help-gnu-emacs@gnu.org
Subject: Re: elisp: how to find an ELT is present an ARRAY or not?
Date: Fri, 09 Dec 2011 05:20:14 +0900 [thread overview]
Message-ID: <8739cug6ip.fsf@live.com> (raw)
In-Reply-To: CAKHQLnpwyTXoTdOn-O98DqjxVc+zEVdQYDkD_7NdO8QV5Ws_-Q@mail.gmail.com
Valentin Baciu <valentin@syntactic.org> writes:
> On Wed, Dec 7, 2011 at 3:39 PM, <yagnesh@live.com> wrote:
>>
>> I am just trying to verify if an element is present in an array or not.
>>
>> here is what I tried,
>>
>> (let ((arr '[AAA BBB CCC]))
>> (mapc (lambda (s)
>> (if (string= "AAA" s)
>> (insert "AAA is a member of arr")))
>> arr))
>>
>> if I eval the above
>> return value is: [AAA BBB CCC] and inserts "AAA is a member of arr" in
>> the buffer
>>
>> But the approach seems wrong to me. Because it loops over all the
>> elements no matter ELT is in it or not and the return value is useless
>> (at least in this case)
>>
>> here is what I really want to achieve:
>>
>> 1) search the array if the element is present
>> 2) if the element is present return "t" otherwise "nil"
>> 3) Since the number of elements in my array will be huge, break the loop
>> and return "t", if it the function find the first occurrence of ELT
>>
>> Thanks
>> --
>> YYR
>>
>>
>
> (when (find "AAA" '[AAA BBB CCC] :test 'string=)
> (insert "Found"))
>
thats the one I wanted (which is in cl package)
Thanks. more questions to come
--
YYR
prev parent reply other threads:[~2011-12-08 20:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-07 13:39 elisp: how to find an ELT is present an ARRAY or not? yagnesh
2011-12-07 13:44 ` Valentin Baciu
2011-12-08 20:20 ` Yagnesh Raghava Yakkala [this message]
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