method
casecmp
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casecmp(p1)
public
Case-insensitive version of String#<=>. Currently, case-insensitivity only works on characters A-Z/a-z, not all of Unicode. This is different from String#casecmp?.
"aBcDeF".casecmp("abcde") #=> 1 "aBcDeF".casecmp("abcdef") #=> 0 "aBcDeF".casecmp("abcdefg") #=> -1 "abcdef".casecmp("ABCDEF") #=> 0
nil is returned if the two strings have incompatible encodings, or if other_str is not a string.
"foo".casecmp(2) #=> nil "\u{e4 f6 fc}".encode("ISO-8859-1").casecmp("\u{c4 d6 dc}") #=> nil