Function join( array, joiner )

Description:
Returns a string composed of concatenating all the elements of an array, separated by a joiner string. If array is not an array, null is returned.
Parameters:
array (Object)
array of numbers or strings
joiner (String)
text string to interpose between adjacent elements
Return Value (String):
string composed of array elements separated by joiner strings
Example:
join(array(1.5,2.1,-3.9), "; ") = "1.5; 2.1; -3.9"
Signature:
String join(Object, String)