var d=Dictionary("A","alpha","D","delta", "B","beta", "C", "gamma");
d.keys.pump(Console.print,fcn(k){String(k,",")})
d.values.apply("toUpper").println();
d.makeReadOnly();  // can only iterate over k,v pairs if read only
foreach k,v in (d){print(k,":",v,"; ")}