How do i print a variable defined in Javascript in Opal-rails

Question

How can i access a variable in opal-ruby code that has been previously defined in javascript? For example in the following code how to fix the opal file.

index.html.erb

...
<script>
  var test = "hi"
</script>
...

index.js.opal

Document.ready? do
  puts test
end

Answer 1

Opal lets you use backticks to output any raw JavaScript that you don't want Opal to interpret, so this will output your test string containing "hi":

Document.ready? do
  puts `test`
end