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tlands/an_unwieldy_mess.rb

Last active December 19, 2015 14:49
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I more or less brute forced the sh!t out of this... Any thoughts to make it tighter/lighter? Also, is this an example of a tail recursive function because nothing is changed after the recursive call, just printed?
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an_unwieldy_mess.rb
def small_num_to_english(n)
# n needs to be < 1000
if n % 100 == 0
["zero", "one hundred", "two hundred", "three hundred", "four hundred",
"five hundred", "six hundred", "seven hundred", "eight hundred", "nine hundred"][n/100]
elsif n >= 0 && n <= 19
%w(zero one two three four five six seven eight nine ten eleven
twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen)[n]
elsif n % 10 == 0 && n < 100
%w(zero ten twenty thirty forty fifty sixty seventy eighty ninety hundred)[n/10]
else
if n % 100 % 10 == 0
"#{small_num_to_english n/100*100} #{small_num_to_english n%100/10*10}"
elsif n < 100
"#{small_num_to_english n%100/10*10} #{small_num_to_english n%100%10}"
else
"#{small_num_to_english n/100*100} #{small_num_to_english n%100/10*10}-#{small_num_to_english n%100%10}"
end
end.capitalize
end
small_num_to_english 57 # => "Fifty seven"
small_num_to_english 239 # => "Two hundred thirty-nine"
small_num_to_english 348 # => "Three hundred forty-eight"
small_num_to_english 999 # => "Nine hundred ninety-nine"
small_num_to_english 527 # => "Five hundred twenty-seven"
small_num_to_english 420 # => "Four hundred twenty"
small_num_to_english 320 # => "Three hundred twenty"
small_num_to_english 310 # => "Three hundred ten"
small_num_to_english 210 # => "Two hundred ten"
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