What is the return value of the following Ruby code?
str = "abc".freeze str += "def" # => ???
The correct answer is
It raises FrozenError
"abcdef"
"abc"
nil
Subscribe to RubyCademy and get free access to all our courses, plus hundreds of fun Ruby cards, quizzes, guides, and tutorials!
String#+ does not modify self. Indeed, it simply returns a new instance of String that is reassigned to str.
str = "abc".freeze str.object_id # => 17320 str = str + "def" # => "abcdef" str.object_id # => 30460
So the first frozen string assigned to str is replaced by the new String returned by String#+.
Subscribe to RubyCademy and get free access to all our courses, plus hundreds of fun Ruby cards, quizzes, guides, and tutorials!
RubyCademy ©