Turn an object into text — practice exercise

What you'll be asked to do

1. 1.Turn an object into textexercise · easy · 10 min

   Stringify a person object and show the text.

   Passes when: #out should show {"name":"Ada"}.

2. 2.Turn text into an objectexercise · easy · 10 min · practice plan

   Parse a JSON string and show the name from it.

   Passes when: #out should show Ada.

3. 3.Round trip an objectexercise · easy · 10 min · practice plan

   Stringify then parse an object and show the year.

   Passes when: #out should show 1815.

4. 4.Make a deep copyexercise · easy · 10 min · practice plan

   Copy a nested object through JSON, change the copy, and show the original city.

   Passes when: #out should show London.

5. 5.Handle invalid JSONexercise · medium · 10 min · practice plan

   Wrap a parse in a try block and report when the text is not valid.

   Passes when: #out should show invalid.

6. 6.Fix parse used instead of stringifybug fix · easy · 8 min

   An object needs turning into text, not the other way round.

   Passes when: #out should show the object as JSON text.

7. 7.Fix the text used without parsingbug fix · easy · 8 min · practice plan

   A JSON string has no properties until it is parsed.

   Passes when: #out should show Ada.

8. 8.Fix the shallow copybug fix · easy · 8 min · practice plan

   Spread shares the nested object, so the original was changed too.

   Passes when: #out should show London.

9. 9.Fix the unguarded parsebug fix · easy · 8 min · practice plan

   Invalid text throws, so the parse needs a try block.

   Passes when: #out should show invalid.

10. 10.Fix the single quotes in the JSONbug fix · easy · 8 min · practice plan

    JSON requires double quotes around every key and string.

    Passes when: #out should show Ada.

Between them these tasks cover JSON.stringify, JSON.parse and Deep copying.

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