palinPerm.js

var palinPerm = function(string) {
  // create object literal to store charcount
  var chars = {};
  var currChar;
  var mulligan = false;
  var isPerm = true;
  // pump characters in, spaces not counted, all lowercase
  string.split('').forEach((char) => {
    if (char !== ' ') {
      currChar = char.toLowerCase();
      if (chars[currChar] === undefined) {
        chars[currChar] = 0;
      }
      chars[currChar]++;
    }
  });
  // check that all chars are even count, except for one exception
  Object.keys(chars).forEach((char) => {
    if (chars[char] % 2 > 0) {
    // if more than one exception, return false
      if (mulligan) {
        isPerm = false; // return in a forEach statment doesn't flow out of function scope
      } else {
        mulligan = true;
      }
    }
  });
  // if not return true
  return isPerm;
};

// TESTS
console.log(palinPerm('Tact Coa'), 'true');
console.log(palinPerm('Tact boa'), 'false');

//Another solution

function palindrom(string) {
  var test = [];
  var arr = string.split('');
  for (char of arr) {
    if (char !== ' ') {
      test.push(char.toLowerCase());
    }
  }
  if (test.join('') === test.reverse().join('')) {
    return true;
  } else {
    return false;
  }
}