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peterbwest (41) [Avatar] Offline
#1
In Listing 2.9 Creating a list and following discussion, you instance mylist[[2]] and mylist[["ages"]]. I found that mylist[2] and mylist["ages"] work the same. This might be worth a comment.
peterbwest (41) [Avatar] Offline
#2
Re: 2.2.6 Lists
A note for programmers.

The period (.) has no special significance in object names. However, the dollar sign ($) has a somewhat analogous meaning, identifying the parts of an object.

The analogous is a bit confusing without a referent. Perhaps

The period (.) has no special significance in object names. However, the dollar sign ($) has a somewhat analogous meaning to the period in other object-oriented languages, identifying the parts of an object.