[ Map ] at: [ Object ]

☞ x ≔ Map new.
x put: ‘a’ at: ‘b’.
x put: ‘xxx’ at: ‘yyy’.
✎ write: (x at: ‘b’), stop.
✎ write: (x yyy), stop.
✎ write: (x ? ‘b’), stop.
a
xxx
a