[procedure] hash-table-get hash-table key [default]

STk, STklos, Gauche: if no entry is found, an error is signalled, unless default is provided. See also hash-table-put!, hash-table-push!, hash-table-pop!.

MzScheme: default must be a thunk if provided; when no entry is found, the thunk is evaluated and returned.

This is called hash-table-ref in some implementations.

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