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<=> 

        # Integer.<=>

(from ruby core)
---
    self <=> other  ->  -1, 0, +1, or nil

---

Returns:

*   -1, if `self` is less than `other`.
*   0, if `self` is equal to `other`.
*   1, if `self` is greater then `other`.
*   `nil`, if `self` and `other` are incomparable.


Examples:

    1 <=> 2              # => -1
    1 <=> 1              # => 0
    1 <=> 0              # => 1
    1 <=> 'foo'          # => nil

    1 <=> 1.0            # => 0
    1 <=> Rational(1, 1) # => 0
    1 <=> Complex(1, 0)  # => 0

This method is the basis for comparisons in module Comparable.

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