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JavaScript String Concatenation — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript String Concatenation 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

    Join two names

    easy10 min

    Join the first and last name with a space.

  2. 2

    Add to a string

    easy10 min

    Build the text up with the plus-equals operator.

  3. 3

    Repeat a string

    easy10 min

    Repeat the pair of letters three times.

  4. 4

    Force the addition first

    easy10 min

    Use brackets so the numbers add before joining.

  5. 5

    Join an array

    medium10 min

    Use join rather than a loop to build the list.

Find the bug(5)

  1. 1

    Fix the missing space

    easy8 min

    The names have run together.

  2. 2

    Fix the numbers joined as text

    easy8 min

    Brackets are needed so the addition happens first.

  3. 3

    Fix the total started as text

    easy8 min

    Starting at an empty string joins the numbers instead of adding.

  4. 4

    Fix repeat used with join

    easy8 min

    repeat takes a count, not a separator.

  5. 5

    Fix the loop that leaves a separator

    easy8 min

    The trailing separator should not be there.

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