From Here to Eternity

Piotr Szotkowski

chastell.net

Java

Date date = new java.util.Date(2012, 7, 21);




 

Java

Date date = new java.util.Date(2012, 7, 21);
// August 21st



 

Java

Date date = new java.util.Date(2012, 7, 21);
// August 21st, 3912



 

Java

Date date = new java.util.Date(2012, 7, 21);
// August 21st, 3912

//   days start from 1
// months start from 0
//  years start from 1,900

Ruby

lightning = Date.new 2012, 7, 21




 

Ruby

lightning = Date.new 2012, 7, 21
#=> July 21st, 2012

#   days start from 1
# months start from 1
#  years start from 1

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17





 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

eurucamp - lightning



 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

eurucamp - lightning
#=> 27 days


 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

eurucamp - lightning
#=> 27 days

lightning..eurucamp
#=> Range of Dates

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

case Date.today



end
 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

case Date.today
when Date.new...lightning     then :before


end
 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

case Date.today
when Date.new...lightning     then :before
when lightning...eurucamp     then :between

end
 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

case Date.today
when Date.new...lightning     then :before
when lightning...eurucamp     then :between
when eurucamp..Date::Infinity then :after
end
 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

case Date.today
when Date.new...lightning     then :before
when lightning...eurucamp     then :between
when eurucamp..Date::Infinity then :after
end
#=> :between

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

(lightning..eurucamp).each do |date|

end



 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

(lightning..eurucamp).each do |date|
  puts date
end



 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

(lightning..eurucamp).each do |date|
  puts date
end
# 2012-07-21
# 2012-07-22
# 2012-07-23
# …

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

(lightning..eurucamp).all? &:friday?
 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

(lightning..eurucamp).all? &:friday?
#=> false :(

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

(lightning..eurucamp).count &:friday?
 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

(lightning..eurucamp).count &:friday?
#=> 4 \o/

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

(lightning..eurucamp).select &:friday?
 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

(lightning..eurucamp).select &:friday?
#=> July 27th, August 3rd, August 10th, August 17th

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

(lightning..eurucamp).each_cons(2) do |lower, upper|

end






 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

(lightning..eurucamp).each_cons(2) do |lower, upper|
  puts "#{lower} - #{upper}"
end






 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

(lightning..eurucamp).each_cons(2) do |lower, upper|
  puts "#{lower} - #{upper}"
end
# 2012-07-21 - 2012-07-22
# 2012-07-22 - 2012-07-23
# 2012-07-23 - 2012-07-24
# 2012-07-24 - 2012-07-25
# 2012-07-25 - 2012-07-26
# 2012-07-26 - 2012-07-27
# 2012-07-27 - 2012-07-28

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

                   (lightning..eurucamp).partition do |date|

end






 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

                   (lightning..eurucamp).partition do |date|
  date.saturday? or date.sunday?
end






 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

weekend, weekday = (lightning..eurucamp).partition do |date|
  date.saturday? or date.sunday?
end






 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

weekend, weekday = (lightning..eurucamp).partition do |date|
  date.saturday? or date.sunday?
end

weekend
#=> July 21st, July 22nd, July 28th, July 29th,
#   August 4th, August 5th, August 11th, August 12th


 

lightning = Date.new 2012, 7, 21
eurucamp  = Date.new 2012, 8, 17

weekend, weekday = (lightning..eurucamp).partition do |date|
  date.saturday? or date.sunday?
end

weekend
#=> July 21st, July 22nd, July 28th, July 29th,
#   August 4th, August 5th, August 11th, August 12th

weekday
#=> the rest :(

class Date
  def free?
    saturday? or sunday? or (month == 8 and day == 15)
  end
end

fun   = %w(✈ ⚓ ⚛ ♥ ♫ ⚘ ✍ ✂ ⚔)














 

fun   = %w(✈ ⚓ ⚛ ♥ ♫ ⚘ ✍ ✂ ⚔)
plans = ->(free) { free ? fun.sample : '⚒' }













 

fun   = %w(✈ ⚓ ⚛ ♥ ♫ ⚘ ✍ ✂ ⚔)
plans = ->(free) { free ? fun.sample : '⚒' }

(lightning..eurucamp).chunk(&:free?).each do |free, dates|

end









 

fun   = %w(✈ ⚓ ⚛ ♥ ♫ ⚘ ✍ ✂ ⚔)
plans = ->(free) { free ? fun.sample : '⚒' }

(lightning..eurucamp).chunk(&:free?).each do |free, dates|
  puts dates.map { plans.(free) }.join ' '
end









 

fun   = %w(✈ ⚓ ⚛ ♥ ♫ ⚘ ✍ ✂ ⚔)
plans = ->(free) { free ? fun.sample : '⚒' }

(lightning..eurucamp).chunk(&:free?).each do |free, dates|
  puts dates.map { plans.(free) }.join ' '
end
# ⚛ ✈








 

fun   = %w(✈ ⚓ ⚛ ♥ ♫ ⚘ ✍ ✂ ⚔)
plans = ->(free) { free ? fun.sample : '⚒' }

(lightning..eurucamp).chunk(&:free?).each do |free, dates|
  puts dates.map { plans.(free) }.join ' '
end
# ⚛ ✈
# ⚒ ⚒ ⚒ ⚒ ⚒







 

fun   = %w(✈ ⚓ ⚛ ♥ ♫ ⚘ ✍ ✂ ⚔)
plans = ->(free) { free ? fun.sample : '⚒' }

(lightning..eurucamp).chunk(&:free?).each do |free, dates|
  puts dates.map { plans.(free) }.join ' '
end
# ⚛ ✈
# ⚒ ⚒ ⚒ ⚒ ⚒
# ✍ ♫
# ⚒ ⚒ ⚒ ⚒ ⚒
# ✈ ⚓
# ⚒ ⚒ ⚒ ⚒ ⚒
# ✂ ✍
# ⚒ ⚒
# ♥
# ⚒ ⚒