Implementing apply on tuples in Scala

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One of the first things you learn as a newcomer to Scala is the difference between a list and a tuple: a list must be homogeneous but a tuple can be heterogeneous. That is all elements of a list must have the same types but a tuple can contain things of different types. A direct consequence of this is that a list can define a by-index accessor and a tuple cannot. You can use list(3) but you…

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