Finished

Test Name	Status
parses normal text as a paragraph	Pass
parsing italics	Pass
parsing bold text	Pass
mixed normal, italics and bold text	Pass
with h1 header level	Pass
with h2 header level	Pass
with h3 header level	Pass
with h4 header level	Pass
with h5 header level	Pass
with h6 header level	Pass
with h7 header level	Pass
unordered lists	Pass
with a little bit of everything	Pass
with markdown symbols in the header text that should not be interpreted	Pass
with markdown symbols in the list item text that should not be interpreted	Pass
with markdown symbols in the paragraph text that should not be interpreted	Pass
unordered lists close properly with preceding and following lines	Pass

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Passed

+// REFACTORING: Markdown parser
+//
+// This code has been refactored to improve readability and maintainability
+// while preserving all existing functionality. The refactoring focuses on:
+//
+// - Clear separation of concerns between different markdown elements
+// - More functional approach with explicit state management
+// - Consistent use of regex patterns for all parsing operations
+// - Better function organization and naming conventions
+// - Improved code structure for easier understanding and modification
+// =============================================================================
+// CONSTANTS AND CONFIGURATION
+// =============================================================================
+// Markdown syntax constants
+const MARKDOWN = {
+  HEADER_PATTERN: /^(#{1,6})\s+(.+)$/,
+  LIST_ITEM_PREFIX: '*',
+  BOLD_DELIMITER: '__',
+  ITALIC_DELIMITER: '_',
+  MAX_HEADER_LEVEL: 6
+};
+// HTML tag constants
+const HTML_TAGS = {
+  BOLD: 'strong',
+  ITALIC: 'em',
+  PARAGRAPH: 'p',
+  LIST: 'ul',
+  LIST_ITEM: 'li'
+};
+// =============================================================================
+// CORE HELPER FUNCTIONS
+// =============================================================================
+// Helper function for HTML wrapping
 function wrap(text, tag) {
   return `<${tag}>${text}</${tag}>`;
+}
+// Helper function to check if text starts with a specific HTML tag
 function isTag(text, tag) {
   return text.startsWith(`<${tag}>`);
+}
+// =============================================================================
+// TEXT FORMATTING FUNCTIONS
+// =============================================================================
+// Generic text formatting parser using regex patterns
+// Replaces text between delimiters with HTML tags
 function parser(markdown, delimiter, tag) {
   const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
   const replacement = `<${tag}>$1</${tag}>`;
   return markdown.replace(pattern, replacement);
+}
+// Bold text parser using double underscore delimiter
 function parse__(markdown) {
+  return parser(markdown, '__', 'strong');
+  return parser(markdown, MARKDOWN.BOLD_DELIMITER, HTML_TAGS.BOLD);
+}
+// Italic text parser using single underscore delimiter
 function parse_(markdown) {
+  return parser(markdown, '_', 'em');
+  return parser(markdown, MARKDOWN.ITALIC_DELIMITER, HTML_TAGS.ITALIC);
+}
+// =============================================================================
+// CONTENT PARSING FUNCTIONS
+// =============================================================================
+// Text content parser with proper formatting
+// Applies bold and italic formatting, then wraps in paragraph tag if not in a list
 function parseText(markdown, list) {
   const parsedText = parse_(parse__(markdown));
   if (list) {
     return parsedText;
   } else {
+    return wrap(parsedText, 'p');
+    return wrap(parsedText, HTML_TAGS.PARAGRAPH);
+  }
+}
+// =============================================================================
+// STRUCTURAL ELEMENT PARSERS
+// =============================================================================
+// Header parser with proper level detection and list handling
+// Detects headers using # symbols (1-6 levels) and handles list state transitions
 function parseHeader(markdown, list) {
+  let count = 0;
+  for (let i = 0; i < markdown.length; i++) {
+    if (markdown[i] === '#') {
+      count += 1;
+    } else {
+      break;
+    }
+  }
+  if (count === 0 || count > 6) {
+  const headerMatch = markdown.match(MARKDOWN.HEADER_PATTERN);
+  if (!headerMatch) {
     return [null, list];
+  }
+  const headerTag = `h${count}`;
+  const headerHtml = wrap(markdown.substring(count + 1), headerTag);
+  const [, hashes, content] = headerMatch;
+  const level = hashes.length;
+  const headerTag = `h${level}`;
+  const headerHtml = wrap(content.trim(), headerTag);
+  // Close list if we were in one and now have a header
   if (list) {
+    return [`</ul>${headerHtml}`, false];
+    return [`</${HTML_TAGS.LIST}>${headerHtml}`, false];
   } else {
     return [headerHtml, false];
+  }
+}
+// List item parser with proper formatting and list state management
+// Detects list items using * symbol and handles list opening/closing
 function parseLineItem(markdown, list) {
+  if (markdown.startsWith('*')) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
+  if (markdown.startsWith(MARKDOWN.LIST_ITEM_PREFIX)) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), HTML_TAGS.LIST_ITEM);
     if (list) {
+      // Already in a list, just add the item
       return [innerHtml, true];
     } else {
+      return [`<ul>${innerHtml}`, true];
+      // Start a new list
+      return [`<${HTML_TAGS.LIST}>${innerHtml}`, true];
+    }
+  }
   return [null, list];
+}
+// Paragraph parser with proper formatting and list state management
+// Handles regular text paragraphs and closes lists when transitioning to paragraphs
 function parseParagraph(markdown, list) {
   if (!list) {
+    // Not in a list, just parse as paragraph
     return [parseText(markdown, false), false];
   } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+    // Close the list and start a paragraph
+    return [`</${HTML_TAGS.LIST}>${parseText(markdown, false)}`, false];
+  }
+}
+// =============================================================================
+// MAIN PARSING PIPELINE
+// =============================================================================
+// Main line parser that dispatches to appropriate specialized parsers
+// Tries parsers in order: headers -> list items -> paragraphs
+// This provides a clear pipeline for processing different markdown elements
 function parseLine(markdown, list) {
   let [result, inListAfter] = parseHeader(markdown, list);
   if (result === null) {
   if (result === null) {
     [result, inListAfter] = parseParagraph(markdown, list);
+  }
+  // This should never be reached as parseParagraph always returns a result
   if (result === null) {
+    throw new Error('Remove this line and implement the function');
+    throw new Error('Unable to parse markdown line');
+  }
   return [result, inListAfter];
+}
 /**
+ * @param {string} markdown
+ * @returns {string}
+ * Main markdown parser function
+ *
+ * Processes markdown text line by line, maintaining list state across lines.
+ * Uses a pipeline approach: split -> parse lines -> combine results.
+ *
+ * @param {string} markdown - The markdown text to parse
+ * @returns {string} - The resulting HTML
  */
 export function parse(markdown) {
   const lines = markdown.split('\n');
   let result = '';
   let list = false;
+  // Process each line, maintaining list state across lines
   for (let i = 0; i < lines.length; i++) {
     let [lineResult, newList] = parseLine(lines[i], list);
     result += lineResult;
     list = newList;
+  }
+  // Close any open list at the end
   if (list) {
+    return result + '</ul>';
+    return result + `</${HTML_TAGS.LIST}>`;
   } else {
     return result;
+  }