title: How to convert Final String [name] to a double in flutter?
body: <p>I am trying to make a calculator but I don't know how to convert a string to a double using the double.parse(<em>name</em>) method? I am reading <em>name</em> from a textfield and passing it to the next page but it takes the form of final String <em>name</em> so it's not static.</p>
  <p>The double.parse() requires a static variable but I don't know how to pass on a static variable between pages. Please help!</p>