In the Exercise playground, you are given a function called loadFile() that will read a text file and return it as a Single. This function works fine and does not need to be edited. Your task is to call that function so that it reads the file, if a legitimate text file is given, and produces an error message when there is a problem.
After you call the function with a filename, it will return a Single object that you can subscribe to and then dispose of (using the disposeBag provided). Be sure to call both these methods on your Single object.
In addition, when you subscribe, you need to pass a block (closure) to the subscribe method. Remember in class we said that Single only has two states: .success and .error. In the case of a .success, this block should print out the string; in the case of an .error, it should print out the error message.
Note that we have provided several files in the Resources directory to use for testing. To verify this fully working, do the following:
-
test
loadText(from: "Quotes")which should load the 42 quotes from HGTTG. -
test
loadText(from: "fix_bug")which should print 'fileNotFound' because that is a png file rather than text -
test
loadText(from: "fix_bugs")which should print 'encodingFailed' because that is not a valid text file -
you can also test the non-existent "Quacks" file or even the "Empty" file provided (works but does nothing) if time allows
If you need additional guidance, all the examples we went over in class (and some we passed over) are available in the Observables playground.