Function concat( s1, s2 )

Description:
Concatenates two strings. In most cases the same effect can be achieved by writing s1+s2, but blank values can sometimes appear as the string "null" if you do it like that.
Parameters:
s1 (String)
first string
s2 (String)
second string
Return Value (String):
s1 followed by s2
Example:
concat("blue", "moon") = "bluemoon"
Signature:
String concat(String, String)