The minmax_by method takes an enumerable collection and returns a 2-element array consisting of the minimum and maximum values, as calculated via the given block. See the examples below for the syntax.
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- View these examples as a runnable ruby script on GitHub.
- Practice this method as an interactive kata on Codewars!
Number List
@numbers = [1, 0, 3, 2, 5, 4, 7, 6, 9, 8]
# lowest/highest numbers:
@numbers.minmax_by{|number| number} #=> [0, 9]
# lowest/highest numbers when negative:
@numbers.minmax_by{|number| 0 - number} #=> [9, 0]
Pet Inventory
# pets with minimum/maximum quantity:
@inventory.minmax_by(&:quantity).map(&:name).join(', ') #=> ["rock", "beetle"]
# pets with fewest/most legs:
@inventory.minmax_by(&:legs).map(&:name).join(', ') #=> ["fish", "scorpion"]
Pokey Things
# first/last pokey things, alphabetically:
@pokey_things.seek(0)
@pokey_things.minmax_by{|thing| thing}.map(&:chomp).join(', ') #=> ["cactus", "pole"]
# smallest/largest pokey things by letter count:
@pokey_things.seek(0)
@pokey_things.minmax_by(&:length).map(&:chomp).join(', ') #=> ["pole", "cactus holding poles with knives attached"]
Heroku Log File
# heroku requests with lowest/highest response times:
@requests.minmax_by(&:response_time).map(&:id) #=> [8, 2]
# heroku requests with lowest/highest service times:
@requests.minmax_by{|request| request.service}.map(&:id) #=> [8, 2]