This function is used to exit from a structured command. The latter
form returns the value of the expression E to the user. If executed
within a nested loop or inside a user-defined function, it breaks out
back to the "top level", not just to the next higher loop. (For
breaks to the next higher loop, see 'Break'.)
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Define Rev(L) -- reverse a list
If Len(L) < 2 Then Return L EndIf;
M := Rev(Tail(L)); -- recursive function call
H := Head(L);
Return Concat(M,[H]);
EndDefine;
Rev([1,2,3,4];
[4, 3, 2, 1]
-------------------------------
-- Another example: returning from a nested loop
For I := 1 To 5 Do
For J := 1 To 5 Do
If J > 2 Then Return Else Print([I,J],' ') EndIf
EndFor;
EndFor;
[1, 1] [1, 2]
-------------------------------
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