--description--

Given strings for a person's name, title, and company, return an email signature as a single string using the following rules:

• The name should appear first, preceded by a prefix that depends on the first letter of the name. For names starting with (case-insensitive):
  • A-I: Use >> as the prefix.
  • J-R: Use -- as the prefix.
  • S-Z: Use :: as the prefix.
• A comma and space (, ) should follow the name.
• The title and company should follow the comma and space, separated by " at " (with spaces around it).

For example, given "Quinn Waverly", "Founder and CEO", and "TechCo" return "--Quinn Waverly, Founder and CEO at TechCo".

--hints--

generateSignature("Quinn Waverly", "Founder and CEO", "TechCo") should return "--Quinn Waverly, Founder and CEO at TechCo".

assert.equal(generateSignature("Quinn Waverly", "Founder and CEO", "TechCo"), "--Quinn Waverly, Founder and CEO at TechCo");

generateSignature("Alice Reed", "Engineer", "TechCo") should return ">>Alice Reed, Engineer at TechCo".

assert.equal(generateSignature("Alice Reed", "Engineer", "TechCo"), ">>Alice Reed, Engineer at TechCo");

generateSignature("Tina Vaughn", "Developer", "example.com") should return "::Tina Vaughn, Developer at example.com".

assert.equal(generateSignature("Tina Vaughn", "Developer", "example.com"), "::Tina Vaughn, Developer at example.com");

generateSignature("B. B.", "Product Tester", "AcmeCorp") should return ">>B. B., Product Tester at AcmeCorp".

assert.equal(generateSignature("B. B.", "Product Tester", "AcmeCorp"), ">>B. B., Product Tester at AcmeCorp");

generateSignature("windstorm", "Cloud Architect", "Atmospheronics") should return "::windstorm, Cloud Architect at Atmospheronics".

assert.equal(generateSignature("windstorm", "Cloud Architect", "Atmospheronics"), "::windstorm, Cloud Architect at Atmospheronics");

--seed--

--seed-contents--

function generateSignature(name, title, company) {

  return name;
}

--solutions--

function generateSignature(name, title, company) {
  const firstLetter = name[0].toUpperCase();
  let prefix;
  if ("ABCDEFGHI".includes(firstLetter)) {
    prefix = ">>";
  } else if ("JKLMNOPQR".includes(firstLetter)) {
    prefix = "--";
  } else {
    prefix = "::";
  }

  return `${prefix}${name}, ${title} at ${company}`;
}