#937 - Reorder Data in Log Files

Problem Description

You are given an array of logs. Each log is a space-delimited string of words, where the first word is the identifier.

There are two types of logs:

Letter-logs: All words (except the identifier) consist of lowercase English letters.
Digit-logs: All words (except the identifier) consist of digits.

Reorder these logs so that:

The letter-logs come before all digit-logs.
The letter-logs are sorted lexicographically by their contents. If their contents are the same, then sort them lexicographically by their identifiers.
The digit-logs maintain their relative ordering.

Return the final order of the logs.

Solution

/**
 * @param {string[]} logs
 * @return {string[]}
 */
var reorderLogFiles = function(logs) {
  const split = logs.map(l => l.split(' '));
  const sortedA = split.filter(l => isNaN(parseInt(l[1], 10))).sort((a, b) => {
    return a[1] !== b[1]
      ? a[1].localeCompare(b[1]) : a[2] !== b[2]
        ? a[2].localeCompare(b[2]) : a.length === b.length
          ? a[0].localeCompare(b[0]) : a.length - b.length;
  }).map(l => l.join(' '));
  const sortedB = split.filter(l => !isNaN(parseInt(l[1], 10)))
    .sort((a, b) => b - a)
    .map(l => l.join(' '));

  return [...sortedA, ...sortedB];
};