chore: claude code refactor (7.5/10)

morse.ts

@@ -54,24 +54,51 @@ export const MORSE_TO_TEXT: Record<string, string> = Object.fromEntries(
   Object.entries(MORSE_CODE).map(([key, value]) => [value, key])
 );
 
+/**
+ * Check if a character is supported in Morse code
+ */
+export function isCharacterSupported(char: string): boolean {
+  return char.toUpperCase() in MORSE_CODE;
+}
+
+/**
+ * Validate if Morse code string is properly formatted
+ */
+export function isValidMorse(input: string): boolean {
+  // Valid morse contains only dots, dashes, spaces, and forward slashes
+  return /^[.\-\s/]*$/.test(input);
+}
+
 /**
  * Convert text to morse code
+ * Unsupported characters are silently skipped
  */
 export function textToMorse(text: string): string {
   return text
     .toUpperCase()
     .split('')
-    .map(char => MORSE_CODE[char] || char)
+    .map(char => MORSE_CODE[char])
+    .filter(code => code !== undefined)
     .join(' ');
 }
 
 /**
  * Convert morse code to text
+ * Invalid morse codes are replaced with '?'
  */
 export function morseToText(morse: string): string {
+  if (!isValidMorse(morse)) {
+    return "";
+  }
+
   return morse
     .split(' ')
-    .map(code => MORSE_TO_TEXT[code] || code)
+    .map(code => {
+      // Handle empty strings (multiple spaces)
+      if (code === '') return '';
+      // Return the decoded character or '?' for unknown codes
+      return MORSE_TO_TEXT[code] || '?';
+    })
     .join('');
 }