swrenn
In the example on page 184, the return value of Pid ! {square, 12}. should be {square, 12} instead of {square, 144}.
1> Pid = spawn(area_server0, loop, []).
<0.36.0>
2> Pid ! {rectangle, 6, 10}.
Area of rectangle is 60
{rectangle,6,10}
3> Pid ! {square, 12}.
Area of square is 144
{square, 144}
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