Simple Pig Latin

SimplePigLatin.js

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+// https://www.codewars.com/kata/simple-pig-latin
+
+// Description:
+// Move the first letter of each word to the end of it, then add "ay" to the end of the word. Leave punctuation marks untouched.
+
+// Examples
+// pigIt('Pig latin is cool'); // igPay atinlay siay oolcay
+// pigIt('Hello world !');     // elloHay orldway !
+
+function pigIt(str){
+  const words = str.split(' ');
+
+  const convertedWords = words.map(word => {
+    var letters = /^[A-Za-z]+$/;
+    return word.match(letters) ?
+      word.substring(1) + word[0] + 'ay' : word;
+  });
+
+  return convertedWords.join(' ');
+}