Question

Which sequence can be used to substitute the value of any ruby expression in a string?

(a) #(expr)

(b) #{expr}

(c) #expr

(d) None of the mentioned

This question was addressed to me in homework.

This intriguing question originated from Library Functions topic in portion Ruby Basics of Ruby

Answer 1

The correct answer is (b) #{expr}

To explain: #{expr} is valid.