Function: mapget
Section: programming/specific
C-Name: mapget
Prototype: GG
Help: mapget(M,x): returns the image of x by the map M.
Doc: Returns the image of $x$ by the map $M$.
\bprog
? M=Map(["a",23;"b",43]);
? mapget(M,"a")
%2 = 23
? mapget(M,"b")
%3 = 43
@eprog\noindent Raises an exception when the key $x$ is not present in $M$.
\bprog
? mapget(M,"c")
*** at top-level: mapget(M,"c")
*** ^-------------
*** mapget: non-existent component in mapget: index not in map
@eprog