method
min_by
![Some documentation Importance_1](https://d2vfyqvduarcvs.cloudfront.net/images/importance_1.png?1349367920)
min_by()
public
Returns the object in enum that gives the minimum value from the given block.
If no block is given, an enumerator is returned instead.
a = %w(albatross dog horse) a.min_by {|x| x.length } #=> "dog"