Create areAnagrams.js

src/areAnagrams.js

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+export const areAnagram = (word1, word2) => {
+  if (typeof word1 !== 'string' || typeof word2 !== 'string') {
+    throw new Error('This requires two strings to be passed.')
+  }
+
+  var normalizedWord1 = word1.replace(/[^A-Za-z]+/g, '').toLowerCase();
+  var normalizedWord2 = word2.replace(/[^A-Za-z]+/g, '').toLowerCase();
+
+  var counts = [];
+  var word1Length = normalizedWord1.length;
+  var word2Length = normalizedWord2.length
+
+  if (word1Length !== word2Length) { return false; }
+
+  for (var i = 0; i < word1Length; i++) {
+    var index = normalizedWord1.charCodeAt(i)-97;
+    counts[index] = (counts[index] || 0) + 1;
+  }
+
+  for (var i = 0; i < word2Length; i++) {
+    var index = normalizedWord2.charCodeAt(i)-97;
+    if (!counts[index]) { return false; }
+    else { counts[index]--; }
+  }
+
+  return true;
+}