Comments in JavaScript

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Question: How do I insert comments in JavaScript code?

Answer: JavaScript supports three different types of comments:

  1. Multiple-line C-style comments. Everything between
    /*
    and
    */
    is a comment, for example:
    /* This is a comment */
    /* C-style comments can span
    as many lines as you like,
    as shown in this example */
    
  2. One-line comments of C++ style. These comments begin with
    //
    and continue up to the next line break:
    // This is a one-line comment
    
  3. One-line comments with the HTML comment-opening sequence (
    <!--
    ). Note that the JavaScript interpreter ignores the closing characters of HTML comments (
    -->
    ). Consider this example:
    <!-- This is treated as a one-line JS comment
    <!-- It works just like a comment beginning with //
    <!-- --> This is also a one-line JS comment
    <!-- --> because JS ignores the closing characters
    <!-- --> of HTML-style comments
    
    HTML-style comments are not usually found in the middle of JavaScript code. (The
    //
    comments are simpler and easier to read.) However, they are useful for hiding JavaScript code from old browsers.

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