agentsqripts/lib/performance/quadratic/extractIterationVariable.js

Comprehensive static code analysis toolkit for identifying technical debt, security vulnerabilities, performance issues, and code quality problems

/**
 * @file Extract iteration variable from loop statement
 * @description Single responsibility: Parse and extract the variable being iterated over
 */

/**
 * Extract variable being iterated over
 */
function extractIterationVariable(line) {
  // Extract variable from: array.forEach, for(... in array), etc.
  const forEachMatch = line.match(/(\w+)\.forEach/);
  if (forEachMatch) return forEachMatch[1];
  
  const forInMatch = line.match(/for\s*\([^)]*in\s+(\w+)/);
  if (forInMatch) return forInMatch[1];
  
  const forOfMatch = line.match(/for\s*\([^)]*of\s+(\w+)/);
  if (forOfMatch) return forOfMatch[1];
  
  // Traditional for loop: for(let i=0; i<array.length; i++)
  const traditionalMatch = line.match(/for\s*\([^;]+;\s*\w+\s*<\s*(\w+)\.length/);
  if (traditionalMatch) return traditionalMatch[1];
  
  // Array method patterns
  const arrayMethodMatch = line.match(/(\w+)\.(map|filter|find|some|every)\s*\(/);
  if (arrayMethodMatch) return arrayMethodMatch[1];
  
  return null;
}

module.exports = extractIterationVariable;