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