just wrote a script to check cross references in the book there are 1,531 sections, and 134 of them (8%) have a mismatch between the apparent indent depth, and the text of the headline valid * Fuel ** Fuel: Diesel *** Fuel: Diesel: Winter Mix invalid ** Fuel: Diesel: Additives
to have only those items from the original variable sections that have an improper count(":")
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it's hugely powerful combined with ruby's left-to-right processing, you can chain very very complicated things together and get huge expressively power with very few words
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k is the key v is the value in a phone book, names are keys, phone numbers are values by convention, the order of items passed in is always key first, then value { |k, v| ... } I can name these variable whatever I want { |day-of-week, car-sales| ... }
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