Availability:built-in
string_concat(?String1,
?String2, ?String3)Similar to atom_concat/3,
but the unbound argument will be unified with a string object rather
than an atom. Also, if both String1 and
String2 are unbound and String3 is bound to text,
it breaks
String3, unifying the start with String1 and the
end with
String2 as append does with lists. Note that this is not
particularly fast on long strings, as for each redo the system has to
create two entirely new strings, while the list equivalent only creates
a single new list-cell and moves some pointers around.
