If statements (https://dev.to/joshcheek/comment/44k3)

best_birthday.rb

# I wrote the below code to verify the results of this video:
# https://www.youtube.com/watch?v=99stb2mzspI&t=399s
# Since you think "`if` statement is always a sign of a design flaw. Period",
# rewrite it without `if` statements in a way that's better (note that `unless <condition>` is `if !<condition>`).

require 'prime'
born = 2184
1.upto 200 do |age|
  year   = born + age
  bases, powers = year.prime_division.transpose
  base = bases.reduce(:*)
  next unless powers.uniq.size == 1 && powers[0] > 1 && base == age
  "#{base}**#{powers[0]} = #{base**powers[0]}"
  # => "3**7 = 2187"
  #    ,"13**3 = 2197"
end

score_test_results.rb

# This website has a test for aspergers: https://www.wired.com/2001/12/aqtest/ 
# The code that's supposed to score the result is apparently broken.
# So, I grabbed my answers and scored them with this code.
# Good news, I don't have aspergers!
#
# Rewrite it in a way you you think is better since you said:
# "`if` statement is always a sign of a design flaw. Period",


# “Definitely agree” or “Slightly agree” responses to questions: score 1 point.
agrees = [2, 4, 5, 6, 7, 9, 12, 13, 16, 18, 19, 20, 21, 22, 23, 26, 33, 35, 39, 41, 42, 43, 45, 46]
 
# “Definitely disagree” or “Slightly disagree” responses to questions: score 1 point.
disagrees = [1, 3, 8, 10, 11, 14, 15, 17, 24, 25, 27, 28, 29, 30, 31, 32, 34, 36, 37, 38, 40, 44, 47, 48, 49, 50]

{ 1=>:da,2=>:ag,3=>:ag,4=>:ag,5=>:ag,6=>:da,7=>:ag,8=>:da,9=>:da,10=>:ag,11=>:ag,12=>:ag,13=>:da,
  14=>:ag,15=>:ag,16=>:ag,17=>:ag,18=>:ag,19=>:ag,20=>:da,21=>:ag,22=>:da,12=>:ag,13=>:da,14=>:ag,
  15=>:ag,16=>:ag,17=>:ag,18=>:ag,19=>:ag,20=>:da,21=>:ag,22=>:da,23=>:da,24=>:ag,25=>:da,26=>:da,
  27=>:da,28=>:ag,29=>:ag,30=>:da,31=>:da,32=>:da,33=>:ag,23=>:da,24=>:ag,25=>:da,26=>:da,27=>:da,
  28=>:ag,29=>:ag,30=>:da,31=>:da,32=>:da,33=>:ag,34=>:ag,35=>:ag,36=>:ag,37=>:da,38=>:ag,39=>:da,
  40=>:ag,41=>:da,42=>:da,43=>:da,44=>:ag,34=>:ag,35=>:ag,36=>:ag,37=>:da,38=>:ag,39=>:da,40=>:ag,
  41=>:da,42=>:da,43=>:da,44=>:ag,45=>:da,46=>:da,47=>:ag,48=>:da,49=>:ag
}.reduce(0) { |score, (index, value)|
  if value == :ag && agrees.include?(index)
    score + 1 # => 2, 3, 4, 5, 7, 8, 9, 10, 11, 17, 18
  elsif value == :da && disagrees.include?(index)
    score + 1 # => 1, 6, 12, 13, 14, 15, 16, 19, 20
  else
    score
  end
} # => 20