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Returns the count of characters (not bytes) in self:

'foo'.length        # => 3
'тест'.length       # => 4
'こんにちは'.length   # => 5

Contrast with String#bytesize:

'foo'.bytesize        # => 3
'тест'.bytesize       # => 8
'こんにちは'.bytesize   # => 15

String#size is an alias for String#length.