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havenwood/just_for_ideas.rb Secret

Created March 6, 2020 18:49
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Some ideas for old_relik on #ruby IRC
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just_for_ideas.rb
def just_for_ideas(a, n)
last = a.pop
magnitude = last.digits.size.pred
limit = n.ceil -magnitude
amount = 10 ** magnitude
[*a, *last.step(by: amount, to: limit)]
end
example = [50, 100, 250, 500, 1000, 2000, 3000, 4000, 5000, 10000]
just_for_ideas(example, 21000)
#=> [50, 100, 250, 500, 1000, 2000, 3000, 4000, 5000, 10000, 20000, 30000]
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