sequencedReadableCollection>>at:ifAbsent:

pattern

at: index ifAbsent: exceptionBlock

parameters

keyword	parameter name	parameter type(s)	aliasing
at:	index	<integer>	uncaptured
ifAbsent:	exceptionBlock	<niladicValuable>	uncaptured

return values

<Object> [state]

<ANY> [unspecified]

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