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1.106.2 LookupTable: accessing

add: anAssociation

Add the anAssociation key to the receiver

associationAt: key ifAbsent: aBlock

Answer the key/value Association for the given key. Evaluate aBlock (answering the result) if the key is not found

at: key ifAbsent: aBlock

Answer the value associated to the given key, or the result of evaluating aBlock if the key is not found

at: aKey ifPresent: aBlock

If aKey is absent, answer nil. Else, evaluate aBlock passing the associated value and answer the result of the invocation

at: key put: value

Store value as associated to the given key