Bob2026-04-04

My Solution: Exercism Bob solution

Instructions

Determine Bob's response based on the input. Bob responds with:

• "Sure." – If you ask a question (ends with ?)
• "Whoa, chill out!" – If you yell (ALL CAPS)
• "Calm down, I know what I'm doing!" – If you yell a question
• "Fine. Be that way!" – If you say nothing (only whitespace)
• "Whatever." – For anything else

Solution

export function hey(message: string): string {
  const trimmed = message.trim();
  if (trimmed === "") {
    return "Fine. Be that way!";
  }
  
  const isQuestion = trimmed.endsWith('?');
  const isYelling = trimmed.toUpperCase() === trimmed && /[A-Z]/.test(trimmed);
  
  if (isQuestion && isYelling) {
    return "Calm down, I know what I'm doing!";
  }
  else if (isQuestion) {
    return "Sure.";
  }
  else if (isYelling) {
    return "Whoa, chill out!";
  }
  return "Whatever.";
}

Tests

// Stating something
console.log(hey('Tom-ay-to, tom-aaaah-to.')); // "Whatever."

// Shouting
console.log(hey('WATCH OUT!')); // "Whoa, chill out!"

// Asking a question
console.log(hey('Does this cryogenic chamber make me look fat?')); // "Sure."

// Yelling a question
console.log(hey('WHAT IS WRONG WITH YOU?')); // "Calm down, I know what I'm doing!"

// Silence
console.log(hey('   ')); // "Fine. Be that way!"

// Empty string
console.log(hey('')); // "Fine. Be that way!"

Mental Model

• trim(): Removes leading/trailing whitespace to detect silence
• endsWith('?'): Checks if trimmed string ends with ?
• trimmed.toUpperCase() === trimmed: Compares uppercase version (all-caps test)
• /[A-Z]/.test(trimmed): Ensures at least one letter exists (prevents "???" from being treated as yelling)