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

+// Constants for better maintainability
+const MARKDOWN_CONSTANTS = {
+  HEADER_CHAR: '#',
+  LIST_CHAR: '*',
+  BOLD_DELIMITER: '__',
+  ITALIC_DELIMITER: '_',
+  MAX_HEADER_LEVEL: 6,
+  HTML_TAGS: {
+    PARAGRAPH: 'p',
+    LIST: 'ul',
+    LIST_ITEM: 'li',
+    BOLD: 'strong',
+    ITALIC: 'em'
+  }
+};
+// Helper function to wrap text in HTML tags
 function wrap(text, tag) {
   return `<${tag}>${text}</${tag}>`;
+}
+// Helper function to check if text starts with a specific tag
 function isTag(text, tag) {
   return text.startsWith(`<${tag}>`);
+}
+function parser(markdown, delimiter, tag) {
+// Helper function to count consecutive characters at the start of a string
+function countLeadingChars(text, char) {
+  let count = 0;
+  for (let i = 0; i < text.length; i++) {
+    if (text[i] === char) {
+      count++;
+    } else {
+      break;
+    }
+  }
+  return count;
+}
+// Helper function to trim whitespace from both ends
+function trim(text) {
+  return text.trim();
+}
+// Generic parser for inline elements (bold, italic)
+function parseInlineElement(markdown, delimiter, tag) {
   const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
   const replacement = `<${tag}>$1</${tag}>`;
   return markdown.replace(pattern, replacement);
+}
+function parse__(markdown) {
+  return parser(markdown, '__', 'strong');
+// Parse bold text (__text__ -> <strong>text</strong>)
+function parseBold(markdown) {
+  return parseInlineElement(markdown, MARKDOWN_CONSTANTS.BOLD_DELIMITER, MARKDOWN_CONSTANTS.HTML_TAGS.BOLD);
+}
+function parse_(markdown) {
+  return parser(markdown, '_', 'em');
+// Parse italic text (_text_ -> <em>text</em>)
+function parseItalic(markdown) {
+  return parseInlineElement(markdown, MARKDOWN_CONSTANTS.ITALIC_DELIMITER, MARKDOWN_CONSTANTS.HTML_TAGS.ITALIC);
+}
+function parseText(markdown, list) {
+  const parsedText = parse_(parse__(markdown));
+// Parse text with inline formatting (bold, italic)
+// If list is true, don't wrap in <p> tags
+function parseFormattedText(markdown, list) {
+  const parsedText = parseItalic(parseBold(markdown));
   if (list) {
     return parsedText;
   } else {
+    return wrap(parsedText, 'p');
+    return wrap(parsedText, MARKDOWN_CONSTANTS.HTML_TAGS.PARAGRAPH);
+  }
+}
+// Parse header elements (# Header -> <h1>Header</h1>)
+// Returns [html, newListState]
 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) {
+  // Count consecutive # characters at the start
+  const count = countLeadingChars(markdown, MARKDOWN_CONSTANTS.HEADER_CHAR);
+  // Headers must have 1-MAX_HEADER_LEVEL # characters
+  if (count === 0 || count > MARKDOWN_CONSTANTS.MAX_HEADER_LEVEL) {
     return [null, list];
+  }
   const headerTag = `h${count}`;
+  const headerHtml = wrap(markdown.substring(count + 1), headerTag);
+  // Extract header content (skip # characters and the following space)
+  const headerContent = trim(markdown.substring(count + 1));
+  const headerHtml = wrap(headerContent, headerTag);
+  // If we were in a list, close it before the header
   if (list) {
+    return [`</ul>${headerHtml}`, false];
+    return [`</${MARKDOWN_CONSTANTS.HTML_TAGS.LIST}>${headerHtml}`, false];
   } else {
     return [headerHtml, false];
+  }
+}
+function parseLineItem(markdown, list) {
+  if (markdown.startsWith('*')) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
+// Parse list items (* item -> <li>item</li>)
+// Returns [html, newListState]
+function parseListItem(markdown, list) {
+  if (markdown.startsWith(MARKDOWN_CONSTANTS.LIST_CHAR)) {
+    // Extract item content (skip * character and the following space)
+    const itemContent = trim(markdown.substring(2));
+    const innerHtml = wrap(parseFormattedText(itemContent, true), MARKDOWN_CONSTANTS.HTML_TAGS.LIST_ITEM);
+    // If we're already in a list, just add the item
+    // Otherwise, start a new list
     if (list) {
       return [innerHtml, true];
     } else {
+      return [`<ul>${innerHtml}`, true];
+      return [`<${MARKDOWN_CONSTANTS.HTML_TAGS.LIST}>${innerHtml}`, true];
+    }
+  }
   return [null, list];
+}
+// Parse paragraph elements
+// Returns [html, newListState]
 function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+  // If we were in a list, close it before the paragraph
+  if (list) {
+    return [`</${MARKDOWN_CONSTANTS.HTML_TAGS.LIST}>${parseFormattedText(markdown, false)}`, false];
   } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+    return [parseFormattedText(markdown, false), false];
+  }
+}
+// Parse a single line of markdown
+// Returns [html, newListState]
 function parseLine(markdown, list) {
+  // Try to parse as header first
   let [result, inListAfter] = parseHeader(markdown, list);
+  // If not a header, try to parse as list item
   if (result === null) {
+    [result, inListAfter] = parseLineItem(markdown, list);
+    [result, inListAfter] = parseListItem(markdown, list);
+  }
+  // If not a list item, parse as paragraph
   if (result === null) {
     [result, inListAfter] = parseParagraph(markdown, list);
+  }
+  // This should never happen with valid input
   if (result === null) {
+    throw new Error('Remove this line and implement the function');
+    throw new Error('Unable to parse line: ' + markdown);
+  }
   return [result, inListAfter];
+}
 /**
+ * @param {string} markdown
+ * @returns {string}
+ * Main markdown parser function
+ * Converts markdown text to HTML
+ * @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;
+  let inList = false; // Track whether we're currently inside a list
+  // Process each line of the markdown
   for (let i = 0; i < lines.length; i++) {
+    let [lineResult, newList] = parseLine(lines[i], list);
+    const currentLine = lines[i];
+    const [lineResult, newInListState] = parseLine(currentLine, inList);
     result += lineResult;
+    list = newList;
+    inList = newInListState;
+  }
+  if (list) {
+    return result + '</ul>';
+  } else {
+    return result;
+  // If we ended while still in a list, close it
+  if (inList) {
+    result += `</${MARKDOWN_CONSTANTS.HTML_TAGS.LIST}>`;
+  }
+  return result;
+}