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IndexOf problem
Posted: November 2nd, 2009, 12:20 pm
by ghaith
hi all
i know i have many questions but for now the most important is how to use String.indexOf()
i don't know why it is not working for me any idea .
thank you
Re: IndexOf problem
Posted: November 2nd, 2009, 1:35 pm
by lloydalvarez
Code: Select all
var str = "my string";
str.indexOf("m"); //result: 0
str.indexOf("s"); //result: 3
str.indexOf("t"); //result: 4
Re: IndexOf problem
Posted: November 16th, 2009, 5:24 am
by laracroft
Hi Ghaith. I am Lara.
Lloydalvarez's code is working. You should try this.
Have a nice day.
Re: IndexOf problem
Posted: May 4th, 2014, 1:49 am
by luigihmtz
Hello, everyone.
It turns out that the indexOf method works fine with strings, but it fails when used with arrays, as opposed to regular javascript, which supports either.
For instance, this expression would cause an error in AE, as it shows Undefined because the variable contains an array. If you try this e.g. on "web" javascript, it won't break:
Code: Select all
fruits = ["Banana", "Orange", "Apple", "Mango"];
a = fruits.indexOf("Apple");
But this one will always work because the variable contains a string, not an array:
Code: Select all
numbers = "95? 10, 034";
a = numbers.indexOf("5");
So how can I retrieve an
index number from some whole element (not an individual character) that is part of an
array of strings by typing its
full string? Just like my fruits example above.
BTW I'm using AECC. Cheers.
Re: IndexOf problem
Posted: May 4th, 2014, 8:18 am
by lloydalvarez
luigihmtz wrote:
It turns out that the indexOf method works fine with strings, but it fails when used with arrays, as opposed to regular javascript, which supports either.
IndexOf is a string function and doesn't work with arrays anywhere. To get an item in an array by index you simply do this:
Code: Select all
myArray[3]; //gets the third item in the array
Re: IndexOf problem
Posted: May 5th, 2014, 1:35 pm
by luigihmtz
IndexOf is a string function and doesn't work with arrays anywhere.
Sorry, my bad, I mixed up stuff.
I do know that
indexOf has a string-only input parameter but, at least in regular javascript, it is NOT a string-only method. What I mean is that you can use either an array of strings or a mere string interchangeably along with
indexOf.
That said, my setback remains true: After Effects appears to be capable of handling strings only, not arrays, regarding the thing whom
indexOf is applied to. I also acknowledge that you can call any element by its index, but I need to do the opposite (hence the use of the
indexOf), I mean, by bringing in a given string element I'll get its corresponding index number, which is the output i need.
I'm still trying to figure this out, but thanks for such a quick answer.
Re: IndexOf problem
Posted: May 5th, 2014, 1:37 pm
by luigihmtz
luigihmtz wrote:
IndexOf is a string function and doesn't work with arrays anywhere.
Sorry, my bad, I mixed up stuff.
I do know that
indexOf has a string-only input parameter but, at least in regular javascript, it is NOT a string-only method. What I mean is that you can use either an array of strings or a mere string interchangeably along with
indexOf.
That said, my setback remains true: After Effects appears to be capable of handling strings only, not arrays, regarding the thing whom
indexOf is applied to. I also acknowledge that you can call any element by its index, but I want to do the opposite (hence the use of the
indexOf), I mean, by bringing in a given string element I'll get its corresponding index number, which is the output i need.
I'm still trying to figure this out, but thanks for such a quick answer.
Re: IndexOf problem
Posted: May 5th, 2014, 2:44 pm
by lloydalvarez
After Effects scripting is "regular" javascript. They are only different in the extended methods. All the base Javascript is exactly the same, i think you are misunderstanding strings and arrays.
Re: IndexOf problem
Posted: May 5th, 2014, 3:15 pm
by luigihmtz
Hopefully this should make my point clearer:
For instance, this expression would cause an error in AE, as it shows Undefined because the variable contains an array. If you try this e.g. on "web" javascript, it won't break:
Code: Select all
fruits = ["Banana", "Orange", "Apple", "Mango"];
a = fruits.indexOf("Apple");
But this one will always work because the variable contains a string, not an array:
Code: Select all
numbers = "95? 10, 034";
a = numbers.indexOf("5");
Thanks!
Re: IndexOf problem
Posted: May 5th, 2014, 4:12 pm
by luigihmtz
OK, I came out with this:
Code: Select all
feed = "Banana";
fruits = [ ];
fruits[0] = "Banana";
fruits[1] = "Orange";
fruits[2] = "Apple";
fruits[3] = "Mango";
for (var i=0; i<fruits.length; i++)
{
if ( feed == fruits[i] ){
idx = i;
break;
} else { 0 }
}
Not quite elegant, but it works.
Re: IndexOf problem
Posted: May 6th, 2014, 2:06 pm
by beginUndoGroup
ExtendScript implements ECMA Standard 262 3rd Edition (December 1999), while the latest 'official' edition is the 5th (June 2011).
There are now plenty of new methods for arrays, like indexOf, every, forEach, map, filter, reduce, some...
But ExtendScript doesnt have them.
You can do something like this:
Code: Select all
function myIndexOf(array, x){
var n=-1, N=array.length;
while (++n<N && array[n]!==x);
return n<N ? n : -1;
};