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Update summing-collections with a link to my source.

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jbranchaud
2015-02-06 22:09:06 -06:00
parent c482ae4d85
commit 9b22766def
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ruby/summing-collections.md
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@@ -30,3 +30,5 @@ that is needed is
my_hash.values.inject(:+)
=> 8
```
[source](http://stackoverflow.com/questions/1538789/how-to-sum-array-of-numbers-in-ruby)