Created
May 9, 2013 22:28
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memoization inside hashes
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| >> tri = Hash.new { |hash,n| hash[n] = (n*(n+1))/2 } | |
| {} | |
| >> tri[1] = 1 # Setup the base case | |
| 1 | |
| >> tri[4] | |
| 10 | |
| >> tri[433] | |
| 93961 |
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