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<small>There is a new edition of the book and this is an old link.</small>

Comments must start with two slashes and continue until the end of the line. For comments that extend beyond a single line, you’ll need to include // on each line.

// So we’re doing something complicated here, long enough that we need
// multiple lines of comments to do it! Whew! Hopefully, this comment will
// explain what’s going on.

Here are the relevant sections in the new and old books:

• in the current edition: Ch 3.04 — Comments
• <small>In the first edition: Ch 3.4 — Comments</small>