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Viewing file:     naturalCmp.js (701 B)      -rw-r--r--

module.exports = function naturalCmp(str1, str2) {
  if (str1 == str2) return 0;
  if (!str1) return -1;
  if (!str2) return 1;

  var cmpRegex = /(\.\d+|\d+|\D+)/g,
    tokens1 = String(str1).match(cmpRegex),
    tokens2 = String(str2).match(cmpRegex),
    count = Math.min(tokens1.length, tokens2.length);

  for (var i = 0; i < count; i++) {
    var a = tokens1[i],
      b = tokens2[i];

    if (a !== b) {
      var num1 = +a;
      var num2 = +b;
      if (num1 === num1 && num2 === num2) {
        return num1 > num2 ? 1 : -1;
      }
      return a < b ? -1 : 1;
    }
  }

  if (tokens1.length != tokens2.length)
    return tokens1.length - tokens2.length;

  return str1 < str2 ? -1 : 1;
};