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casecmp 

        # String.casecmp

(from ruby core)
---
    casecmp(other_string) -> -1, 0, 1, or nil

---

Compares `self.downcase` and `other_string.downcase`; returns:

*   -1 if `other_string.downcase` is larger.
*   0 if the two are equal.
*   1 if `other_string.downcase` is smaller.
*   `nil` if the two are incomparable.


Examples:

    'foo'.casecmp('foo') # => 0
    'foo'.casecmp('food') # => -1
    'food'.casecmp('foo') # => 1
    'FOO'.casecmp('foo') # => 0
    'foo'.casecmp('FOO') # => 0
    'foo'.casecmp(1) # => nil

See [Case Mapping](doc/case_mapping_rdoc.html).

Related: String#casecmp?.

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