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Make a note about summing an empty array.

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jbranchaud
2015-02-06 22:21:43 -06:00
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ruby/summing-collections.md
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@@ -31,4 +31,13 @@ my_hash.values.inject(:+)
=> 8 => 8
``` ```
To take this one step further, let's consider what will happen with an empty
array. The above approach will produce `nil`. If we want `0` when the list
is empty, then tell `#inject` to do just that
```ruby
[].inject(0, :+)
=> 0
```
[source](http://stackoverflow.com/questions/1538789/how-to-sum-array-of-numbers-in-ruby) [source](http://stackoverflow.com/questions/1538789/how-to-sum-array-of-numbers-in-ruby)