String interpolation prints variable name instead of variable contents

Question

I have a class like this:

class Example
    def printThisVar(printThing)
        print 'this is the var: #{printThing}'   
    end
end

However, the string that is printed is printed is "this is the var: #{printThing}" not "this is the var: exampleText".

Is there any way to fix this? thanks!

Answer 1

You have single quotes instead of double quotes around the string you want to print.

class Example
    def print_this_var(print_thing)
        print 'this is the var: #{print_thing}'
    end
end

foo = Example.new
foo.print_this_var("example_text")

#=> this is the var: #{print_thing}

Changing the method definition to

        print "this is the var: #{print_thing}"

yields

#=> this is the var: example_text

String interpolation doesn't work with single quotes.