Check the online state type — practice exercise

What you'll be asked to do

1. 1.Check the online state typeexercise · easy · 10 min

   Report the type of navigator.onLine.

   Passes when: #out should show boolean.

2. 2.Read the languageexercise · easy · 10 min · practice plan

   Report the type of navigator.language.

   Passes when: #out should show string.

3. 3.Check for a featureexercise · easy · 10 min · practice plan

   Write a function that checks for clipboard support.

   Passes when: #out should show supported.

4. 4.Check languages is a listexercise · easy · 10 min · practice plan

   Report whether navigator.languages is an array.

   Passes when: #out should show a list.

5. 5.Check userAgent existsexercise · medium · 10 min · practice plan

   Report the type of navigator.userAgent.

   Passes when: #out should show string.

6. 6.Fix the type check invertedbug fix · easy · 8 min

   The check for a boolean was written backwards.

   Passes when: #out should show a real boolean.

7. 7.Fix the browser name checked instead of the featurebug fix · easy · 8 min · practice plan

   Checking for the feature itself is more reliable than the browser name.

   Passes when: #out should show found the feature.

8. 8.Fix languages read as one stringbug fix · easy · 8 min · practice plan

   navigator.languages is a list of preferences, not a single string.

   Passes when: #out should show confirmed a list.

9. 9.Fix clipboard called before checking for itbug fix · easy · 8 min · practice plan

   Test for the feature before relying on it, in case it is missing.

   Passes when: #out should show was checked.

10. 10.Fix the wrong case used for onLinebug fix · easy · 8 min · practice plan

    The property is spelled onLine with a capital L.

    Passes when: #out should show boolean.

Between them these tasks cover navigator, Feature detection and onLine.

Looking for a different chapter? See every practice set, or switch to the interview theory questions.