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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
function isPermutation(string) {
  let charHash = buildCharFrequencyHash(string);
  return checkMaxOneOdd(charHash);
}

function buildCharFrequencyHash(string){
  let charHash = [];

  for (let i = 0; i < string.length; i++) {
    let char = string.charAt(i);

    if(char === ' ') {
      continue;
    }

    if (charHash[char]) {
      charHash[char]++;
    } else {
      charHash[char] = 1;
    }
  }

  return charHash;
}

function checkMaxOneOdd(charHash) {
  let foundOdd = false;
  for (let key in charHash) {
    if (charHash[key] % 2 == 1) {
      if (foundOdd) {
        return false;
      }

      foundOdd = true;
    }
  }
  return true;
}

console.log(isPermutation('taco cat'))
</script>


<script id="jsbin-source-javascript" type="text/javascript">function isPermutation(string) {
  let charHash = buildCharFrequencyHash(string);
  return checkMaxOneOdd(charHash);
}

function buildCharFrequencyHash(string){
  let charHash = [];

  for (let i = 0; i < string.length; i++) {
    let char = string.charAt(i);

    if(char === ' ') {
      continue;
    }

    if (charHash[char]) {
      charHash[char]++;
    } else {
      charHash[char] = 1;
    }
  }

  return charHash;
}

function checkMaxOneOdd(charHash) {
  let foundOdd = false;
  for (let key in charHash) {
    if (charHash[key] % 2 == 1) {
      if (foundOdd) {
        return false;
      }

      foundOdd = true;
    }
  }
  return true;
}

console.log(isPermutation('taco cat'))
</script></body>
</html>