Variable variables stored in an array and called == problem.

I am missing something fundamental here.

I have an array:

arr1 = ['one', 'two', 'three'];

I have three functions named one, two, and three.

Is it possible to use arr1[0]();? (Or something like it, since that is
obviously not the correct method.)

--
-Lost
Remove the extra words to reply by e-mail. Don't e-mail me. I am
kidding. No I am not.

-Lost wrote on 27 mei 2007 in comp.lang.javascript:

I am missing something fundamental here.

I have an array:

arr1 = ['one', 'two', 'three'];

I have three functions named one, two, and three.

Is it possible to use arr1[0]();? (Or something like it, since that is
obviously not the correct method.)

<script type='text/javascript'>

var arr = ['one', 'two', 'three'];

function one(){
alert('-ONE-');
};

window[arr[0]]();

</script>

--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

On May 27, 7:52 pm, -Lost <maventheextrawo... (AT) techie (DOT) com> wrote:

I am missing something fundamental here.

I have an array:

arr1 = ['one', 'two', 'three'];

I have three functions named one, two, and three.

Is it possible to use arr1[0]();? (Or something like it, since that is
obviously not the correct method.)

--
-Lost
Remove the extra words to reply by e-mail. Don't e-mail me. I am
kidding. No I am not.

If that's really what you need, then
eval( arr1[0] + "()" );
// not tested

Darko wrote on 27 mei 2007 in comp.lang.javascript:

On May 27, 7:52 pm, -Lost <maventheextrawo... (AT) techie (DOT) com> wrote:
I am missing something fundamental here.

I have an array:

arr1 = ['one', 'two', 'three'];

I have three functions named one, two, and three.

Is it possible to use arr1[0]();? (Or something like it, since that is
obviously not the correct method.)

--
-Lost
Remove the extra words to reply by e-mail. Don't e-mail me. I am
kidding. No I am not.

If that's really what you need, then
eval( arr1[0] + "()" );
// not tested

eval() is evil and not necessary here,
see my other post for a better solution.


--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

Evertjan. a écrit :

eval() is evil and not necessary here,
see my other post for a better solution.

Don't know if that answer to the question, but in addition this works :

arr[0] = function () { one(); }
arr[0]();

--
Stephane Moriaux et son (moins) vieux Mac déjà dépassé
Stephane Moriaux and his (less) old Mac already out of date

ASM wrote on 27 mei 2007 in comp.lang.javascript:

Evertjan. a écrit :

eval() is evil and not necessary here,
see my other post for a better solution.

Don't know if that answer to the question, but in addition this works :

arr[0] = function () { one(); }
arr[0]();

It is not, please read the OQ.

--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

In comp.lang.javascript message <QbSdnUnM1t2KWMTbnZ2dnUVZ_rCsnZ2d@comcas
t.com>, Sun, 27 May 2007 13:52:33, -Lost <maventheextrawords (AT) techie (DOT) com>
posted:

I have an array:

arr1 = ['one', 'two', 'three'];

I have three functions named one, two, and three.

Is it possible to use arr1[0]();? (Or something like it, since that is
obviously not the correct method.)

function one() { alert(1) }
function two() { alert(2) }
function six() { alert(6) }

arr1 = [one, two, six]

arr1[1]() // alerts 2

may be useful to you, unless you are obliged to use an array of strings.

--
(c) John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v6.05 IE 6.
Web <URL:http://www.merlyn.demon.co.uk/> - w. FAQish topics, links, acronyms
PAS EXE etc : <URL:http://www.merlyn.demon.co.uk/programs/> - see 00index.htm
Dates - miscdate.htm moredate.htm js-dates.htm pas-time.htm critdate.htm etc.

On Sun, 27 May 2007 at 18:35:13, in comp.lang.javascript, Evertjan.
wrote:

-Lost wrote on 27 mei 2007 in comp.lang.javascript:

I am missing something fundamental here.

I have an array:

arr1 = ['one', 'two', 'three'];

I have three functions named one, two, and three.

Is it possible to use arr1[0]();? (Or something like it, since that is
obviously not the correct method.)


script type='text/javascript'

var arr = ['one', 'two', 'three'];

function one(){
alert('-ONE-');
};

window[arr[0]]();

/script

Yes. But.

The OP hasn't said that one, two, and three are *global* functions. We
are just guessing that they are.

The OP hasn't said that the code is running in a browser, and so has a
window variable. We are just guessing that it has.

The OP hasn't said if the code can run inside a 'with' statement and
whether the function names are allowed to be captured by the 'with'
object. We are just guessing that they aren't.

To make 'arr[0]' do exactly what writing 'one' would have done you need
to use 'eval'. Since this is evil we need to know what the OP is trying
to do : there might be a better way.

John
--
John Harris

John G Harris said the following on 5/28/2007 3:28 PM:

On Sun, 27 May 2007 at 18:35:13, in comp.lang.javascript, Evertjan.
wrote:
-Lost wrote on 27 mei 2007 in comp.lang.javascript:

I am missing something fundamental here.

I have an array:

arr1 = ['one', 'two', 'three'];

I have three functions named one, two, and three.

Is it possible to use arr1[0]();? (Or something like it, since that is
obviously not the correct method.)

script type='text/javascript'

var arr = ['one', 'two', 'three'];

function one(){
alert('-ONE-');
};

window[arr[0]]();

/script

Yes. But.

The OP hasn't said that one, two, and three are *global* functions. We
are just guessing that they are.

Considering that they asked how to execute that function though, it is
pretty reasonable to assume they are global functions.

The OP hasn't said that the code is running in a browser, and so has a
window variable. We are just guessing that it has.

The default, here - unless stated otherwise -, is that it is running in
a browser.

The OP hasn't said if the code can run inside a 'with' statement and
whether the function names are allowed to be captured by the 'with'
object. We are just guessing that they aren't.

And whether it can or not is irrelevant.

To make 'arr[0]' do exactly what writing 'one' would have done you need
to use 'eval'.

I flat don't believe that. In fact, I know it isn't true.

--
Randy
Chance Favors The Prepared Mind
comp.lang.javascript FAQ - http://jibbering.com/faq/index.html
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

Evertjan. wrote:

-Lost wrote on 27 mei 2007 in comp.lang.javascript:

I am missing something fundamental here.

I have an array:

arr1 = ['one', 'two', 'three'];

I have three functions named one, two, and three.

Is it possible to use arr1[0]();? (Or something like it, since that is
obviously not the correct method.)


script type='text/javascript'

var arr = ['one', 'two', 'three'];

function one(){
alert('-ONE-');
};

window[arr[0]]();

/script

Many thanks. Out of all the replies, this is what I was looking for.

--
-Lost
Remove the extra words to reply by e-mail. Don't e-mail me. I am
kidding. No I am not.