lookup(M,A) -- provides the binary method named
M for class
A. The first place to look is
A#M. The search proceeds with the parent of
A, and so on.
lookup(M,A,B) -- provides the binary method named
M for
(A,B). The first place to look is
Y#(M,A,B) where
Y is the younger of
A and
B. The search proceeds next with the parent of
B, and so on.
lookup(M,A,B,C) -- provides the ternary method named
M for
(A,B,C). The first place to look is
Y#(M,A,B,C) where
Y is the youngest of
A,
B, and
C. The search proceeds with the parent of
C, and so on.
lookup(M,A,B,C,D) -- provides the quaternary method named
M for
(A,B,C,D). The first place to look is
Y#(M,A,B,C,D) where
Y is the youngest of
A,
B,
C, and
D. The search proceeds with the parent of
D, and so on.
lookup x -- where
x is a symbol or function, returns
x.
If no method is found, then
null is returned.