I believe the second to the last sentence in the third paragraph contains a few typos.
The single element pattern in our anonymous function implies, more specifically, that the the response it a list.
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@jasullivan Thank you!
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Another typo on Page 7 of the PDF:
If a pattern match is successful, it returns the data that matched the patter, which is “truthy.”
patter should be pattern
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Good catch, I just fixed that, thanks 
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