s.from(s1 [s2 ...])
s - str variable.
s1, s2, ... - string or numeric values.
str does not support expression s = s1 + s2 to join two strings. For this purpose is used function from.
To append other string to the end or beginning of s, you can also use + or - operator.
str s = "notepad" str ss.from(s ".exe") now ss is "notepad.exe" The same with +: ss=s s+".exe"