Created
September 20, 2018 14:32
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| def foo(number, index = 1) | |
| # limit | |
| raise ArgumentError, 'number must be <= 10 000' if number > 10_000 | |
| # exit | |
| return number.to_s if number == index | |
| # step | |
| index.to_s + ' ' + foo(number, index + 1) | |
| end |
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