elisp: how to find an ELT is present an ARRAY or not?

elisp: how to find an ELT is present an ARRAY or not?

[yagnesh]

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

Re: elisp: how to find an ELT is present an ARRAY or not?

[Valentin Baciu]

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"))

Re: elisp: how to find an ELT is present an ARRAY or not?

[Yagnesh Raghava Yakkala]

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