Add array tally for ruby
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@ -12,3 +12,10 @@ puts true if arr.uniq.length == 1
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```ruby
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(subarray & array) == array
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```
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## Compute values occurences
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```ruby
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[1, 1, 2, 3, 4, 5, 5, 5, 5].tally
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=> {1=>2, 2=>1, 3=>1, 4=>1, 5=>4}
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```
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