build-in function for obtaining the index of an element of a list

build-in function for obtaining the index of an element of a list

[ishi soichi]

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I have a question about Emacs Lisp.

Is there any Emacs built-in function that returns the index of an element
of a list?

More specifically, say I have a list

(setq lista '("apple" "banana" "orange))

then implement the function, which I want,

(functionName lista "banana")    ; => 1

If not, please give me an example of such function definition.

Thanks in advance!

soichi

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Re: build-in function for obtaining the index of an element of a list

[Juanma Barranquero]

> Is there any Emacs built-in function that returns the index of an element of
> a list?

If you don't mind using the CL package (included with Emacs), the
function you want is `position'

 (position "banana" '("apple" "banana" "orange") :test 'string=)   =>  1

    Juanma

Re: build-in function for obtaining the index of an element of a list

[ishi soichi]

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Thanks. This is what I wanted.

soichi

2012/1/4 Juanma Barranquero <lekktu@gmail.com>

> > Is there any Emacs built-in function that returns the index of an
> element of
> > a list?
>
> If you don't mind using the CL package (included with Emacs), the
> function you want is `position'
>
>  (position "banana" '("apple" "banana" "orange") :test 'string=)   =>  1
>
>     Juanma
>

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