const quarterOf = (month) => { switch (month.toLowerCase()) { case 'january': case 'february': case 'march': return 'first quarter'; break; case 'april': case 'may': case 'june': return 'second quarter'; break; case 'july': case 'august': case 'september': return 'third quarter'; break; case 'october': case 'november': case 'december': return 'fourth quarter'; break; } }