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JavaScript Semicolons — exercises and bug fixes

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

    End statements with semicolons

    easy10 min

    Write two terminated statements and show the second value.

  2. 2

    Separate statements on one line

    easy10 min

    Two statements on one line need a semicolon between them.

  3. 3

    Terminate a declaration

    easy10 min

    Declare a value, end the statement, then display it.

  4. 4

    Return on the same line

    easy10 min

    Return a value on the same line as return to avoid ASI problems.

  5. 5

    Terminate before a parenthesis

    medium10 min

    A missing semicolon before a ( can join two lines — avoid it here.

Find the bug(5)

  1. 1

    Fix the return broken by a newline

    easy8 min

    A newline after return makes it return undefined.

  2. 2

    Fix the missing separator

    easy8 min

    Two statements share a line with no semicolon between them.

  3. 3

    Fix the comma used as a terminator

    easy8 min

    A comma continues the declaration instead of ending it.

  4. 4

    Fix the semicolon after if

    easy8 min

    A semicolon straight after if() ends the statement early.

  5. 5

    Fix the missing semicolon before a bracket

    easy8 min

    The next line is treated as an index of the previous value.

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