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JavaScript Array slice and splice — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript Array slice and splice lesson. Every one is checked automatically in the browser — write the code, run it, and the tests tell you what still fails.

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Exercises(5)

  1. 1

    Take a slice

    easy10 min

    Copy the middle two values out of a list and join them with commas.

  2. 2

    Slice from the end

    easy10 min

    Copy the last two values using a negative index.

  3. 3

    Copy a whole array

    easy10 min

    Copy an array with slice, push onto the copy, and show the original length.

  4. 4

    Remove with splice

    easy10 min

    Remove two values from the middle and show what is left.

  5. 5

    Insert with splice

    medium10 min

    Insert two values in the middle without removing anything.

Find the bug(5)

  1. 1

    Fix slice given a count

    easy8 min

    The second argument is an end index, not how many to take.

  2. 2

    Fix splice used to copy

    easy8 min

    splice changes the original, so the list was damaged.

  3. 3

    Fix splice removing when inserting

    easy8 min

    A count of 1 removes a value that should have stayed.

  4. 4

    Fix the copy that is not a copy

    easy8 min

    Assigning the array shares it rather than copying it.

  5. 5

    Fix splice starting in the wrong place

    easy8 min

    The removal begins one position too early.

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