Round to two decimals — practice exercise

What you'll be asked to do

1. 1.Round to two decimalsexercise · easy · 10 min

   Format the price to two decimal places.

   Passes when: #out should show 19.57.

2. 2.Keep trailing zerosexercise · easy · 10 min · practice plan

   Format a whole number as money.

   Passes when: #out should show 5.00.

3. 3.Convert to binaryexercise · easy · 10 min · practice plan

   Report 255 in base two.

   Passes when: #out should show 11111111.

4. 4.Convert to hexexercise · easy · 10 min · practice plan

   Report 255 in base sixteen.

   Passes when: #out should show ff.

5. 5.Convert the result backexercise · medium · 10 min · practice plan

   Round to two decimals then add one as a number.

   Passes when: #out should show 20.57.

6. 6.Fix the string result added tobug fix · easy · 8 min

   toFixed returns a string, so plus joins instead of adding.

   Passes when: #out should show 20.57.

7. 7.Fix round used instead of toFixedbug fix · easy · 8 min · practice plan

   Math.round loses the trailing zeros that money needs.

   Passes when: #out should show 5.00.

8. 8.Fix the missing basebug fix · easy · 8 min · practice plan

   Without a base, toString gives the ordinary decimal form.

   Passes when: #out should show 11111111.

9. 9.Fix toPrecision used for decimalsbug fix · easy · 8 min · practice plan

   toPrecision counts all digits, not just the decimals.

   Passes when: #out should show 19.57.

10. 10.Fix the wrong number of decimalsbug fix · easy · 8 min · practice plan

    Money needs two decimal places, not one.

    Passes when: #out should show 19.57.

Between them these tasks cover toFixed, toString and Base conversion.

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