agentsqripts/lib/wet-code/ast/refactoring/findCommonPrefix.js

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

/**
 * @file Find common prefix in strings
 * @description Single responsibility: Extract shared prefix from string array
 */

function findCommonPrefix(strings) {
  if (!strings || strings.length === 0) return '';
  if (strings.length === 1) return strings[0];
  
  // Sort to make comparison easier
  const sorted = strings.slice().sort();
  const first = sorted[0];
  const last = sorted[sorted.length - 1];
  
  let i = 0;
  while (i < first.length && first[i] === last[i]) {
    i++;
  }
  
  // Return common prefix, but only if it's meaningful (at least 3 chars)
  const prefix = first.substring(0, i);
  return prefix.length >= 3 ? prefix : '';
}

module.exports = findCommonPrefix;