Joan Didion's compared her feelings for New York. She did compare it to the love one feels in a romantic relationship. This actually affects the tone of the narrative in the following way: It subtly stresses the narrative's comic tone.
Tone, in literature actually talks about the expression of the author's attitude or feelings towards the matter or issue. Tone can be used to determine/create the mood of the audience.
Tone can be:
We can see that Didion's use of the words “a city for only the very young” shows narrative's comic tone.
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