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YAPC::EU 2018 Glasgow Update!

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Ingy döt Net 2018-08-17 15:15:24 +01:00
parent 22f33d4004
commit 4e2d22a71d
1170 changed files with 15042 additions and 3047 deletions
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26
Task/Five-weekends/Ruby/five-weekends.rb
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@ -2,22 +2,14 @@ require 'date'
# The only case where the month has 5 weekends is when the last day
# of the month falls on a Sunday and the month has 31 days.
dates = []
1900.upto(2100) do |year|
1.upto(12) do |month|
d = Date.new(year, month, -1) # -1 is last day of month
dates << d if d.sunday? && d.day == 31
end
end
LONG_MONTHS = [1,3,5,7,8,10,12]
YEARS = (1900..2100).to_a
dates = YEARS.product(LONG_MONTHS).map{|y, m| Date.new(y,m,31)}.select(&:sunday?)
years_4w = YEARS - dates.map(&:year)
puts "There are #{dates.size} months with 5 weekends from 1900 to 2100:"
puts dates.first(5).map { |d| d.strftime("%b %Y") }
puts "..."
puts dates.last(5).map { |d| d.strftime("%b %Y") }
years_with_5w = dates.map(&:year)
years = (1900..2100).to_a - years_with_5w
puts "There are #{years.size} years without months with 5 weekends:"
puts years.join(", ")
puts dates.first(5).map {|d| d.strftime("%b %Y") }, "..."
puts dates.last(5).map {|d| d.strftime("%b %Y") }
puts "There are #{years_4w.size} years without months with 5 weekends:"
puts years_4w.join(", ")