1
var wordPattern = function (pattern, s) {
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  let wordArray = s.split(" ");
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  if (wordArray.length !== pattern.length) return false;
4

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  let hm = {};
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  let hs = new Set();
7

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  for (let index in pattern) {
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    let word = wordArray[index];
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    let char = pattern[index];
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    if (hm[char] !== undefined) {
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      if (hm[char] !== word) return false;
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    } else {
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      if (hs.has(word)) return false; // Duplicate Occurence of word on first occurrence of a char
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      hm[char] = word;
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      hs.add(word);
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    }
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  }
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  return true;
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};