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27 lines
725 B
Text
27 lines
725 B
Text
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Returns +true+ if +self+ and +object+ are equal after Unicode case folding,
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otherwise +false+:
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lower = :abc
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upper = :ABC
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upper.casecmp?(lower) # => true
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lower.casecmp?(lower) # => true
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lower.casecmp?(upper) # => true
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Returns nil if +self+ and +object+ have incompatible encodings,
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or if +object+ is not a symbol:
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sym = 'äöü'.encode("ISO-8859-1").to_sym
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other_sym = 'ÄÖÜ'
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sym.casecmp?(other_sym) # => nil
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:foo.casecmp?(2) # => nil
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Unlike Symbol#casecmp, works for characters outside of 'A'..'Z' and 'a'..'z':
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lower = :äöü
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upper = :ÄÖÜ
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upper.casecmp?(lower) # => true
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lower.casecmp?(lower) # => true
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lower.casecmp?(upper) # => true
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Related: Symbol#casecmp, String#casecmp?.
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