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# frozen_string_literal: true
# Borrowed from https://gist.github.com/amydoesntlai/74eb9aef1ea4b535f8fe
require "date"
class AgeCalculator
# Calculates an age based on the given current date.
#
# @param birth_date Date
# @param current_date Date
# @return [Hash] containing the year, month and day
#
def compute(birth_date, current_date)
calculation = build_calculation(birth_date, current_date)
compute_days(calculation, birth_date, current_date)
compute_months(calculation, birth_date, current_date)
handle_future_dates(calculation)
build_hash(calculation)
end
private
def build_calculation(birth_date, current_date)
OpenStruct.new(
days: current_date.day - birth_date.day,
months: current_date.month - birth_date.month,
years: current_date.year - birth_date.year,
borrowed_month: false
)
end
def compute_days(calculation, birth_date, current_date)
return unless calculation.days < 0
days_in_month = Time.days_in_month(birth_date.month)
calculation.days = (days_in_month - birth_date.day) + current_date.day
calculation.months -= 1
calculation.borrowed_month = true
end
def compute_months(calculation, birth_date, current_date)
return unless calculation.months < 0
months_in_year = 12
calculation.months = (months_in_year - birth_date.month) + current_date.month
calculation.months -= 1 if calculation.borrowed_month
calculation.years -= 1
end
# Error-handling for future date
#
def handle_future_dates(calculation)
return unless calculation.years < 0
calculation.years = calculation.months = calculation.days = 0
end
def build_hash(calculation)
calculation.to_h.delete_if { |k, _v| k == :borrowed_month }
end
end
Version data entries
39 entries across 39 versions & 1 rubygems