Class: AgeJp::Calculator

Inherits:
Object
  • Object
show all
Defined in:
lib/age_jp/calculator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(birthday) ⇒ Calculator

Returns a new instance of Calculator.



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# File 'lib/age_jp/calculator.rb', line 5

def initialize(birthday)
  @birthday = birthday
end

Instance Attribute Details

#birthday ⇒ Object (readonly)

Returns the value of attribute birthday.



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# File 'lib/age_jp/calculator.rb', line 3

def birthday
  @birthday
end

Instance Method Details

#age_at(date = Date.current) ⇒ Object 



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# File 'lib/age_jp/calculator.rb', line 9

def age_at(date = Date.current)
  return unless valid_birthday? && valid_date?(date)

  calculate_age(date)
end

#age_jp_at(date = Date.current) ⇒ Object 



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# File 'lib/age_jp/calculator.rb', line 15

def age_jp_at(date = Date.current)
  return unless valid_birthday? && valid_date?(date)

  calculate_age_jp(date)
end

#east_asian_age_reckoning_at(date = Date.current) ⇒ Object 



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# File 'lib/age_jp/calculator.rb', line 21

def east_asian_age_reckoning_at(date = Date.current)
  return unless valid_birthday? && valid_date?(date)

  age = calculate_age(date)
  until_birthday_this_year?(date) ? age + 2 : age + 1
end

#insurance_age_at(date = Date.current) ⇒ Object 



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# File 'lib/age_jp/calculator.rb', line 28

def insurance_age_at(date = Date.current)
  return unless valid_birthday? && valid_date?(date)

  # date時点での満年齢を取得
  age = calculate_age(date)

  # その年齢に到達した誕生日を取得
  last_birthday = birthday.next_year(age)

  # 前回の誕生日から計算基準日までの月差分を取得
  month_diff = (date.year * 12 + date.month) - (last_birthday.year * 12 + last_birthday.month)

  # 月差分だけlast_birthdayをmonths_sinceした日付と、dateを比較し、month_diffの値を調整する
  # ex)
  #   - last_birthday: 1/25
  #   - date:          2/15
  #   の場合、month_diffは、1だが、実際には0ヶ月差分としたい
  #   - last_birthday.months_since(month_diff)  => 2/25
  #   として、date < last_birthday.months_since(month_diff) の場合は、month_diff -= 1 を月差分とする
  #
  # last_birthday   date    month_diff    months_since後    adjusted_month_diff
  # 2/25            2/27    0             2/25              0
  # 2/25            3/1     1             3/25              0
  # 2/25            3/27    1             3/25              1
  # 2/25            4/1     2             4/25              1
  # 2/25            4/27    2             4/25              2
  month_diff -= 1 if date < last_birthday.months_since(month_diff)

  age += 1 if month_diff > 6

  age
end