Graham  
Xtscript does not have an array function but here is how to "fake" a simple array
first the function script

<!--parser:xtscript--> #<!-- function array $d;$n;$nv;$sv;$fl=first;$m=read;$sep=| var $o = -1 var $i = 0 if $m == count var $n = 1000 else var $n = ($n+1) endif if not $m == search goto @l2 endif if $fl == first var $p = call strpos $haystack=$sep$d$sep;$needle=$sep$sv$sep else if $fl == last var $p = call strrpos $haystack=$sep$d$sep;$needle=$sep$sv$sep endif if not $p return -1 endif @l1 if $o <= $p var $oo = ($o+1) var $o = call strpos $haystack=$sep$d$sep;$needle=$sep;$offset=$oo var $i = ($i+1) goto @l1 endif return ($i-2) @l2 if $m==count var $rv=($i-2) else delete $rv endif if $i > $n or not $o return $rv endif if $i < $n var $oo = ($o+1) var $o = call strpos $haystack=$d$sep;$needle=$sep;$offset=$oo var $i = ($i+1) goto @l2 endif if $m == read var $val = call substr $val=$d;$start=$oo;$length=($o-$oo) return $val endif if $m ==replace var $arr1 = call substr $val=$d;$start=0;$length=$oo var $arr2 = call substr $val=$d;$start=$o return $arr1$nv$arr2 endif if $m == insert var $arr1 = call substr $val=$d;$start=0;$length=$oo var $arr2 = call substr $val=$d;$start=$oo return $arr1$nv$sep$arr2 endif if $m == delete var $arr1 = call substr $val=$d;$start=0;$length=($oo-1) var $arr2 = call substr $val=$d;$start=$o return $arr1$arr2 endif endfunction #--> <!--/parser:xtscript-->

Define the array
var $arr= banana|apple|orange|grape|lemon|mango
If you change the separator used in the array set $sep=new separator in your array function calls
Or to change it permanently change the default for $sep in the function script

To read a element in the array (read is the default mode so it can be omitted )
var $value = call array $d=$arr;$n=4;$m=read
Returns the 4th element (starting from 0) which is "lemon"

To replace an element in the array
var $arr=call array $d=$arr;$n=4;$nv=melon;$m=replace
Array is now "banana|apple|orange|grape|melon|mango"

To insert an element into the array
var $arr=call array $d=$arr;$n=4;$nv=rhubarb;$m=insert
Array is now "banana|apple|orange|grape|rhubarb|melon|mango "

To delete an element from the array
var $arr=call array $d=$arr;$n=4;$m=delete
Array is now "banana|apple|orange|grape|melon|mango"

To search for a value in the array and return the elements position
$sv is the value to search for
$fl is first or last occurrence default is first ( can be omitted )
var $value = call array $d=$arr;$sv=melon;$fl=first;$m=search
Returns "4" for "melon"
Returns "-1" if the value is not found

To count the elements in an array
var $value = call array $d=$arr;$m=count
Returns "5" (remember the first element is 0)
Note: Out of range values for $n will also return the element count