Safe navigation and fetch in Ruby

Ruby

&. stops at nil; fetch raises rather than returning nil when a key is genuinely required.

city = user&.address&.city || 'unknown'

port = config.fetch('port')          # raises if absent
host = config.fetch('host', 'localhost')

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Ruby ruby nil-safety hashes chris

More in Ruby

Group and count in Ruby Ruby tally does the counting; group_by keeps the members when you need them.

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