leetcode longest prefix

longestprefix.js

/**
 * @param {string[]} strs
 * @return {string}
 */
function longestCommonPrefix(strs) {
  if (strs.length === 0) {
    return "";
  }

  let prefix = strs[0];

  for (let word of strs) {
    while (word.indexOf(prefix) !== 0) {
      prefix = prefix.slice(0, -1);
      if (prefix === '') {
        return '';
      }
    }
  }
  return prefix;
};