quickBrownFox

function test(candidate){
  return candidate === passing;
}

var sentence = "The quick brown fox jumps.";
var passing = "Jumps fox brown quick the.";

function turnaround(sentence){
  sentence = sentence.toLowerCase().replace('.','').split(' ');
  sentence = sentence.reverse().join(' ')+".";
  sentence = sentence[0].toUpperCase() + sentence.slice(1,sentence.length);
  return sentence;
}

var candidate = turnaround(sentence);
test(candidate);


var sentence = "The quick brown fox -- Mr. Fennec -- jumps.";
var passing = "Jumps -- Fennec Mr. -- fox brown quick the.";

function turnaroundWithCapsAndPunctuation(sentence){
  sentence = sentence.slice(0, sentence.length - 1).split(' ');
  sentence[0] = sentence[0].toLowerCase();
  sentence = sentence.reverse().join(' ') + ".";
  sentence = sentence[0].toUpperCase() + sentence.slice(1,sentence.length);
  return sentence;
};

var candidate = turnaroundWithCapsAndPunctuation(sentence);
test(candidate);



var sentence = "The quick brown fox -- Mr. Fennec -- jumps?";
var passing = "Jumps -- Fennec Mr. -- fox brown quick the?";

function turnaroundWithCapsAndKeepingPunctuation(sentence){
  var punctuation = sentence[sentence.length - 1];
  sentence = sentence.slice(0, sentence.length - 1).split(' ');
  sentence[0] = sentence[0].toLowerCase();
  sentence = sentence.reverse().join(' ') + punctuation;
  sentence = sentence[0].toUpperCase() + sentence.slice(1,sentence.length);
  return sentence;
};

var candidate = turnaroundWithCapsAndKeepingPunctuation(sentence);
test(candidate);