14. 最长公共前缀

/**
 * @param {string[]} strs
 * @return {string}
 */
var longestCommonPrefix = function (strs) {
  let prefix = ''
  strs.sort((a, b) => a.length - b.length)
  for (let i = 0; i < strs[0].length; i++) {
    const char = strs[0][i]
    if (strs.every((str) => str[i] === char)) {
      prefix += char
    } else {
      break
    }
  }
  return prefix
}