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

+function wrap(text, tag) {
+// REFACTORING NOTES:
+// 1. Improved function naming for clarity
+// 2. Separated concerns better
+// 3. Added comprehensive comments
+// 4. Simplified control flow
+// 5. Made state management more explicit
+/**
+ * Wraps text in HTML tags
+ * @param {string} text - The text to wrap
+ * @param {string} tag - The HTML tag name
+ * @returns {string} The wrapped text
+ */
+function wrapTextInTag(text, tag) {
   return `<${tag}>${text}</${tag}>`;
+}
+function isTag(text, tag) {
+/**
+ * Checks if text starts with a specific HTML tag
+ * @param {string} text - The text to check
+ * @param {string} tag - The tag to look for
+ * @returns {boolean} Whether the text starts with the tag
+ */
+function startsWithTag(text, tag) {
   return text.startsWith(`<${tag}>`);
+}
+function parser(markdown, delimiter, tag) {
+/**
+ * Generic parser for markdown delimiters (like * for emphasis, __ for bold)
+ * @param {string} markdown - The markdown text to parse
+ * @param {string} delimiter - The delimiter pattern
+ * @param {string} htmlTag - The HTML tag to replace with
+ * @returns {string} The parsed HTML
+ */
+function parseMarkdownDelimiter(markdown, delimiter, htmlTag) {
   const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
+  const replacement = `<${tag}>$1</${tag}>`;
+  const replacement = `<${htmlTag}>$1</${htmlTag}>`;
   return markdown.replace(pattern, replacement);
+}
+function parse__(markdown) {
+  return parser(markdown, '__', 'strong');
+/**
+ * Parses bold text (using __ delimiter)
+ * @param {string} markdown - The markdown text to parse
+ * @returns {string} The parsed HTML with bold tags
+ */
+function parseBoldText(markdown) {
+  return parseMarkdownDelimiter(markdown, '__', 'strong');
+}
+function parse_(markdown) {
+  return parser(markdown, '_', 'em');
+/**
+ * Parses italic text (using _ delimiter)
+ * @param {string} markdown - The markdown text to parse
+ * @returns {string} The parsed HTML with emphasis tags
+ */
+function parseItalicText(markdown) {
+  return parseMarkdownDelimiter(markdown, '_', 'em');
+}
+function parseText(markdown, list) {
+  const parsedText = parse_(parse__(markdown));
+  if (list) {
+/**
+ * Parses text formatting (bold and italic) and optionally wraps in paragraph tags
+ * @param {string} markdown - The markdown text to parse
+ * @param {boolean} isListItem - Whether this text is part of a list item
+ * @returns {string} The parsed HTML
+ */
+function parseTextFormatting(markdown, isListItem) {
+  // Apply bold formatting first, then italic (order matters for nested formatting)
+  const parsedText = parseItalicText(parseBoldText(markdown));
+  if (isListItem) {
     return parsedText;
   } else {
+    return wrap(parsedText, 'p');
+    return wrapTextInTag(parsedText, 'p');
+  }
+}
+function parseHeader(markdown, list) {
+  let count = 0;
+/**
+ * Parses markdown headers (lines starting with #)
+ * @param {string} markdown - The markdown line to parse
+ * @param {boolean} currentlyInList - Whether we're currently inside a list
+ * @returns {Array} [parsedHtml, stillInList] - The parsed HTML and updated list state
+ */
+function parseHeader(markdown, currentlyInList) {
+  // Count consecutive # characters at the start
+  let headerLevel = 0;
   for (let i = 0; i < markdown.length; i++) {
     if (markdown[i] === '#') {
+      count += 1;
+      headerLevel += 1;
     } else {
       break;
+    }
+  }
+  if (count === 0 || count > 6) {
+    return [null, list];
+  // Valid headers have 1-6 # characters
+  if (headerLevel === 0 || headerLevel > 6) {
+    return [null, currentlyInList];
+  }
+  const headerTag = `h${count}`;
+  const headerHtml = wrap(markdown.substring(count + 1), headerTag);
+  if (list) {
+  const headerTag = `h${headerLevel}`;
+  const headerContent = markdown.substring(headerLevel + 1).trim();
+  const headerHtml = wrapTextInTag(headerContent, headerTag);
+  // If we were in a list, close it before the header
+  if (currentlyInList) {
     return [`</ul>${headerHtml}`, false];
   } else {
     return [headerHtml, false];
+  }
+}
+function parseLineItem(markdown, list) {
+/**
+ * Parses markdown list items (lines starting with *)
+ * @param {string} markdown - The markdown line to parse
+ * @param {boolean} currentlyInList - Whether we're currently inside a list
+ * @returns {Array} [parsedHtml, stillInList] - The parsed HTML and updated list state
+ */
+function parseListItem(markdown, currentlyInList) {
   if (markdown.startsWith('*')) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
+    if (list) {
+      return [innerHtml, true];
+    const listItemContent = markdown.substring(2).trim(); // Remove '* ' prefix
+    const formattedContent = parseTextFormatting(listItemContent, true);
+    const listItemHtml = wrapTextInTag(formattedContent, 'li');
+    if (currentlyInList) {
+      // Continue existing list
+      return [listItemHtml, true];
     } else {
+      return [`<ul>${innerHtml}`, true];
+      // Start new list
+      return [`<ul>${listItemHtml}`, true];
+    }
+  }
+  return [null, list];
+  return [null, currentlyInList];
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+/**
+ * Parses regular paragraphs (fallback for lines that aren't headers or list items)
+ * @param {string} markdown - The markdown line to parse
+ * @param {boolean} currentlyInList - Whether we're currently inside a list
+ * @returns {Array} [parsedHtml, stillInList] - The parsed HTML and updated list state
+ */
+function parseParagraph(markdown, currentlyInList) {
+  if (!currentlyInList) {
+    // Regular paragraph when not in a list
+    return [parseTextFormatting(markdown, false), false];
   } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+    // Close list and start new paragraph
+    return [`</ul>${parseTextFormatting(markdown, false)}`, false];
+  }
+}
+function parseLine(markdown, list) {
+  let [result, inListAfter] = parseHeader(markdown, list);
+  if (result === null) {
+    [result, inListAfter] = parseLineItem(markdown, list);
+/**
+ * Parses a single line of markdown by trying different parsers in order
+ * @param {string} markdown - The markdown line to parse
+ * @param {boolean} currentlyInList - Whether we're currently inside a list
+ * @returns {Array} [parsedHtml, stillInList] - The parsed HTML and updated list state
+ */
+function parseMarkdownLine(markdown, currentlyInList) {
+  // Try parsing as header first (highest priority)
+  let [parsedHtml, inListState] = parseHeader(markdown, currentlyInList);
+  // If not a header, try parsing as list item
+  if (parsedHtml === null) {
+    [parsedHtml, inListState] = parseListItem(markdown, currentlyInList);
+  }
+  if (result === null) {
+    [result, inListAfter] = parseParagraph(markdown, list);
+  // If not header or list item, parse as paragraph (fallback)
+  if (parsedHtml === null) {
+    [parsedHtml, inListState] = parseParagraph(markdown, currentlyInList);
+  }
+  if (result === null) {
+    throw new Error('Remove this line and implement the function');
+  // This should never happen since parseParagraph always returns a result
+  if (parsedHtml === null) {
+    throw new Error('Failed to parse markdown line');
+  }
+  return [result, inListAfter];
+  return [parsedHtml, inListState];
+}
 /**
+ * @param {string} markdown
+ * @returns {string}
+ * Main markdown parser function - converts markdown to HTML
+ * Processes the input line by line, maintaining list state across lines
+ * @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 htmlResult = '';
+  let currentlyInList = false;
+  // Process each line, maintaining list state
   for (let i = 0; i < lines.length; i++) {
+    let [lineResult, newList] = parseLine(lines[i], list);
+    result += lineResult;
+    list = newList;
+    const [lineHtml, stillInList] = parseMarkdownLine(lines[i], currentlyInList);
+    htmlResult += lineHtml;
+    currentlyInList = stillInList;
+  }
+  if (list) {
+    return result + '</ul>';
+  // Close any unclosed list at the end
+  if (currentlyInList) {
+    return htmlResult + '</ul>';
   } else {
+    return result;
+    return htmlResult;
+  }
+}