I have created a small list and am attempting to use the "IndexOf" function to see if a specific item is in the list, and if so, at what position.  The documentation states the following:

List->IndexOf (Element: ObjectType, StartIndex:Integer):Integer
Returns the first index of a list item. The item is searched for from the start index.

No matter what I do, it seems to always return 0.  Here is the code I'm testing.

let L (List)
L = List("Item1","Item2","Item3","Item4" )
Message("List Size: " + L.Size())
Message("Get Item 3: " + L.GetItem(3))
Message("IndexOf 'Item2': " + L.IndexOf("Item2",0))

Can anyone offer any suggestions on what I'm doing incorrectly?  Thanks!

You are correct, that works perfectly.    Thank you!

Apparently this is trickier than I expected.  Any idea why this won't work?

let L(List)
let s(String)
let i (Integer)

L = List("40mm","50mm","75mm","100mm","150mm" )

s = "75mm"

i = L.IndexOf(s,0)

Message("Index of " + s + ": " + i)

Ultimately I'm trying to get to this (which doesn't work either):

/* P is an already existing parameter with multiple values.  It has been populated with the following line: */
/* P.AuthorizedValues = List("40mm","50mm","75mm","100mm","150mm" ) */

let L (List)
let s (String)
let i (Integer)

L = P.AuthorizedValues    /* Load all the values from P into the list L - This part is working ok as far as I can tell */

s = P    /* Set s equal to the current value of P - This part works fine as well */

i = L.IndexOf(s,0)    /* Find what position the current value of P (s) is in the list of possible values for P */
 
Message("Index of " + s + ": " + i)

I realize I can loop thru the list, but I was hoping the built in "find" ability of the IndexOf function would be more efficient.  I have a routine that goes through each item in the list and does a more complex compare on each item and attempts to find the closest match, but I figured if there was an exact match that could be located by the IndexOf function, I wouldn't even need to enter the loop.  For the sake of my education, could you explain how this isn't the intended usage, and maybe as well what is?  Thanks!