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Adjust life expectancy by current age #3

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Adjust life expectancy by current age #3

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37 changes: 34 additions & 3 deletions terminal_sunday.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,36 @@

birthdate = ARGV[0]
name = ARGV.length > 1 ? ARGV[1] : ENV['USER']
life_expectancy = 80

LIFE_EXPECTANCY = [
# Via Statistics Canada https://www150.statcan.gc.ca/t1/tbl1/en/tv.action?pid=1310013401
[25, 80.2],
[30, 80.4],
[35, 80.6],
[40, 80.8],
[45, 81.1],
[50, 81.5],
[55, 82.0],
[60, 82.8],
[65, 83.8],
[70, 85.2],
[75, 86.9],
[80, 89.1],
[85, 91.8],
[90, 95.1]
]
def life_expectancy_at(age_in_years)
# Short-circuit outside census range
return 80 if age_in_years < 25
return age_in_years + 5 if age_in_years >= 90

# Otherwise linearly interpolate between steps
i = LIFE_EXPECTANCY.index { |age, expect| age <= age_in_years }
baseline = LIFE_EXPECTANCY[i][1]
step_progress = (age_in_years - LIFE_EXPECTANCY[i][0]) / 5.0
step_change = LIFE_EXPECTANCY[i+1][1] - LIFE_EXPECTANCY[i][1]
baseline + step_change * step_progress
end

begin
birthdate_parsed = Date.parse(birthdate)
Expand All @@ -21,8 +50,10 @@

current_date = Date.today
weeks_passed = (current_date - birthdate_parsed).to_i / 7
years_passed = weeks_passed / 52
life_expectancy = life_expectancy_at(years_passed)
total_weeks = life_expectancy * 52
weeks_remaining = total_weeks - weeks_passed
weeks_remaining = (total_weeks - weeks_passed).to_i
birth_year = birthdate_parsed.year
years_passed = (current_date.year - birth_year)
last_year = birth_year + life_expectancy - 1
Expand All @@ -36,6 +67,6 @@
line_break = (year_index == life_expectancy - 1) ? "\n" : "\n\n"
print line_break if (year_index + 1) % 20 == 0
end
print " " * 55 + last_year.to_s
print " " * 55 + last_year.to_i.to_s

puts "\n\nHow are you going to spend these Sundays, #{name}?"