Ruby - Enumerable min max Custom Comparisons

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Introduction

To make min and max to return items based on some other criterion, define the nature of the comparison inside a block.

You can similarly pass blocks to the max and min methods: 

h.min{ |a,b| a[0].length <=> b[0].length }   
h.max{|a,b| a[0].length <=> b[0].length }

So, if a hash contains items like this: 

{'one'=>'1', 'two'=>'2'}

then the two block arguments, a and b, would be initialized to two arrays: 

a = ['one', '1'] 
b = ['two', '2']

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