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Blank Lines (JavaScript) is one of the source-code metrics Understand computes across 17+ languages — browse them in the GUI, export and track them, or script them with the Python API.

Metrics overview

Blank Lines (JavaScript)

API ID: CountLineBlankJavascript
Languages: Web
Targets: Architectures, Files, Project

Number of blank JavaScript lines.

Only counts blank lines inside an embedded sub-language block; see Blank Lines (HTML) for blank lines in the surrounding page.

For example:


<!DOCTYPE html>
<html>
<head>
  <title>Welcome</title>

  <!-- Greeting script: tracks visits and confirms with the user -->
  <script>
    // Number of times the page has greeted someone
    var greetingCount = 0;

    function greetUser(name) {
      greetingCount++;
      return "Hello, " + name + "!";
    }

    let message = greetUser("Ada");
    console.log(message);

    if (greetingCount > 0) {
      confirm(message);
    }
  </script>
</head>
<body>
  <h1>Welcome to the site</h1>
  <p>Have a look around.</p>
</body>
</html>

Lines 10, 15, and 18, separating the script's declarations and statements, are the only blank JavaScript lines, giving CountLineBlankJavascript = 3.

See Blank Lines (HTML) for blank lines outside embedded scripts, and Blank Lines for the language-independent metric this breaks down.

Targets By Language: Configuration: