feat: added another answer for chp.1 q4 (careercup#66)

Author: sea-witch

chapter01/1.4 - PalinPerm/palinPerm2.js

@@ -0,0 +1,20 @@
+function palinPerm(s) {
+  const sanitized = s.toUpperCase().split(" ").join("");
+  const freq = new Map();
+  for (let i = 0; i < sanitized.length; i++) {
+    const char = sanitized.charAt(i);
+    const prevFreq = freq.get(char) || 0;
+    freq.set(char, prevFreq + 1);
+  }
+  let oddCount = 0;
+  for (let char of freq) {
+    if (char[1] % 2 !== 0) {
+      oddCount++;
+    }
+  }
+  return oddCount < 2;
+}
+
+// TESTS
+console.log(palinPerm('Tact Coa'), 'true');
+console.log(palinPerm('Tact boa'), 'false');