Convert Bolded Paragraphs to Headings with Google Apps Script

/**
 * Adds a custom menu to the Google Docs UI for easy access.
 */
function onOpen() {
  DocumentApp.getUi()
    .createMenu('Custom Scripts')
    .addItem('Convert Bold Paragraphs to H3', 'convertBoldParagraphsToH3')
    .addToUi();
}

/**
 * Finds all paragraphs with bolded text and converts them to Heading 3.
 */
function convertBoldParagraphsToH3() {
  var doc = DocumentApp.getActiveDocument();
  var body = doc.getBody();
  var paragraphs = body.getParagraphs();
  var convertedCount = 0;

  paragraphs.forEach(function(paragraph) {
    // Check if the paragraph contains any bold text
    var textElement = paragraph.editAsText();
    var isBold = false;
    
    for (var i = 0; i < textElement.getText().length; i++) {
      if (textElement.isBold(i)) {
        isBold = true;
        break;
      }
    }

    // If the paragraph contains bold text, convert it to Heading 3
    if (isBold) {
      paragraph.setHeading(DocumentApp.ParagraphHeading.HEADING3);
      convertedCount++;
    }
  });

  DocumentApp.getUi().alert(convertedCount + ' bolded paragraphs have been converted to Heading 3.');
}