anagram.js

const stringCleaner = str => {
  const strWithoutCharacters = str.replace(/[^A-Z0-9]/gi, "");
  return strWithoutCharacters.toLowerCase();
};

const buildCharacterMap = str => {
  const chars = str.split("");

  const charMap = chars.reduce((obj, char) => {
    obj[char] ? obj[char]++ : (obj[char] = 1);
    return obj;
  }, {});

  return charMap;
};

const isEqual = (obj1, obj2) => {
  const obj1Keys = Object.keys(obj1);
  const obj2Keys = Object.keys(obj2);

  if (obj1Keys.length !== obj2Keys.length) {
    return false;
  }

  for (let objKey of obj1Keys) {
    if (obj1[objKey] !== obj2[objKey]) {
      return false;
    }
  }

  return true;
};

const str1 = buildCharacterMap(stringCleaner("Jim Morrison"));
const str2 = buildCharacterMap(stringCleaner("Mr. Mojo Risin'"));

isEqual(str1, str2); //?

const isAnagram = (str, comparisonStr) => {
  const strObj = buildCharacterMap(stringCleaner(str));
  const comparisonStrObj = buildCharacterMap(stringCleaner(comparisonStr));

  return strObj === comparisonStrObj;
};

isAnagram("Jim Morrison", "Mr. Mojo Risin'");
isAnagram("Damon Albarn", "Dan Abnormal");
isAnagram("George Bush", "He bugs Gore");
isAnagram("Clint Eastwood", "Old West action");
isAnagram("Ronald Reagan", "A darn long era");
isAnagram("Elvis", "Lives");
isAnagram("Madonna Louise Ciccone", "One cool dance musician");
isAnagram("Bart", "Brat");