// noprotect

​

function generateSentence(args) {

   let n = args.length;

   let sentences = [

      'You didn\'t give me any arguments.',

      'You gave me 1 argument and it is {lastArg}',

      `You gave me ${n} arguments and they are {args} and {lastArg}`

   ];

   let sentence = n > 1 ? sentences[2] : sentences[n];

​

   return sentence;

}

​

function templateSentence(sentence, list) {

   return sentence

      .replace('{args}', list.slice(0, -1).join(', '))

      .replace('{lastArg}', list.slice(-1));

}

​

function strFormatAlternative(...args) {

   let list = args.map(arg => `"${arg}"`);

​

   return templateSentence(generateSentence(list), list);

}

​

function strFormat(...args) {

   if (args.length === 0) {

      return "You didn't give me any arguments.";

   }

   if (args.length === 1) {

      return `You gave me 1 argument and it is "${args[0]}"`;

   }

   var formattedArguments = args

      .map(argument => `"${argument}"`)

      .join(', ')

      .replace(/(.*), (.*)$/, '$1 and $2');

   return `You gave me ${args.length} arguments ` +

          `and they are ${formattedArguments}.`;

}

​

function test(limit, callback) {

    var now = performance.now();

​

   for (var i = 0; i < limit; i++) {

      callback()

      callback('fizz');

      callback('fizz', 'buzz');

   }

​

   return performance.now() - now;

}

​

var time1 = test(100000, strFormat);

var time2 = test(100000, strFormatAlternative);

​

console.log('Aurelio\'s solution takes ' + time1 + ' milliseconds');

console.log('Other solution takes ' + time2 + ' milliseconds');