Как найти самое длинное слово в строке

• Алгоритмическая задача
• Предложенные тест-кейсы
  • Находим самое длинное слово при помощи цикла FOR
  • Находим самое длинное слово с помощью метода sort()
  • Находим самое длинное слово с помощью метода reduce()

function findLongestWord(str) {
  return str.length;
}
findLongestWord("The quick brown fox jumped over the lazy dog");

var strSplit = “The quick brown fox jumped over the lazy dog”.split(‘ ‘);

var strSplit = [“The”, “quick”, “brown”, “fox”, “jumped”, “over”, “the”, “lazy”, “dog”];

var strSplit = 
[“T”, “h”, “e”, “ “, “q”, “u”, “i”, “c”, “k”, “ “, “b”, “r”, “o”, “w”, “n”, “ “, “f”, “o”, “x”, “ “, “j”, “u”, “m”, “p”, “e”, “d”, “ “, “o”, “v”, “e”, “r”, “ “, “t”, “h”, “e”, “ “, “l”, “a”, “z”, “y”, “ “, “d”, “o”, “g”];

function findLongestWord(str) {
  // Этап 1. Разбиваем строку на массив строк
  var strSplit = str.split(' ');
  // var strSplit = "The quick brown fox jumped over the lazy dog".split(' ');
  // var strSplit = ["The", "quick", "brown", "fox", "jumped", "over", "the", "lazy", "dog"];
	
  // Этап 2. Инициализируем переменную, которая будет содержать в себе размер самого длинного слова
  var longestWord = 0;

  // Этап 3. Создаем цикл FOR
  for(var i = 0; i < strSplit.length; i++){
    if(strSplit[i].length > longestWord){ // If strSplit[i].length больше, чем сравнимое слово...
	longestWord = strSplit[i].length; // ...затем longestWord принимает новое значение
     }
  }
  /* Здесь strSplit.length = 9
     Для каждой итерации: i = ?   i < strSplit.length?   i++  if(strSplit[i].length > longestWord)?   longestWord = strSplit[i].length
     1 итерация:        0             yes             1   if("The".length > 0)? => if(3 > 0)?     longestWord = 3
     2 итерация:        1             yes             2   if("quick".length > 3)? => if(5 > 3)?   longestWord = 5   
     3 итерация:        2             yes             3   if("brown".length > 5)? => if(5 > 5)?   longestWord = 5   
     4 итерация:        3             yes             4   if("fox".length > 5)? => if(3 > 5)?     longestWord = 5  
     5 итерация:        4             yes             5   if("jumped".length > 5)? => if(6 > 5)?  longestWord = 6 
     6 итерация:        5             yes             6   if("over".length > 6)? => if(4 > 6)?    longestWord = 6 
     7 итерация:        6             yes             7   if("the".length > 6)? => if(3 > 6)?     longestWord = 6
     8 итерация:        7             yes             8   if("lazy".length > 6)? => if(4 > 6)?    longestWord = 6 
     9 итерация:        8             yes             9   if("dog".length > 6)? => if(3 > 6)?     longestWord = 6 
     10 итерация:       9             no               
     Конец цикла FOR */

  //Этап 4. Возвращаем самое длинное слово
  return longestWord; // 6
}

findLongestWord("The quick brown fox jumped over the lazy dog");

function findLongestWord(str) {
  var strSplit = str.split(' ');
  var longestWord = 0;
  for(var i = 0; i < strSplit.length; i++){
    if(strSplit[i].length > longestWord){
	longestWord = strSplit[i].length;
     }
  }
  return longestWord;
}
findLongestWord("The quick brown fox jumped over the lazy dog");

var sortArray = [“The”, “quick”, “brown”, “fox”, “jumped”, “over”, “the”, “lazy”, “dog”].sort();

var sortArray = [“The”, “brown”, “dog”, “fox”, “jumped”, “lazy”, “over”, “quick”, “the”];

[].sort(function(firstElement, secondElement) { 
    return secondElement.length — firstElement.length; 
})

function findLongestWord(str) {
  // Этап 1. Разбиваем строку на массив строк
  var strSplit = str.split(' ');
  // var strSplit = "The quick brown fox jumped over the lazy dog".split(' ');
  // var strSplit = ["The", "quick", "brown", "fox", "jumped", "over", "the", "lazy", "dog"];

  // Этап 2. Сортируем элементы в массиве
  var longestWord = strSplit.sort(function(a, b) { 
    return b.length - a.length;
  });
  /* Процесс сортировки
    a           b            b.length     a.length     var longestWord
  "The"      "quick"            5            3         ["quick", "The"]
  "quick"    "brown"            5            5         ["quick", "brown", "The"]  
  "brown"    "fox"              3            5         ["quick", "brown", "The", "fox"]
  "fox"      "jumped"           6            3         ["jumped", quick", "brown", "The", "fox"]
  "jumped"   "over"             4            6         ["jumped", quick", "brown", "over", "The", "fox"]
  "over"     "the"              3            4         ["jumped", quick", "brown", "over", "The", "fox", "the"]
  "the"      "lazy"             4            3         ["jumped", quick", "brown", "over", "lazy", "The", "fox", "the"]
  "lazy"     "dog"              3            4         ["jumped", quick", "brown", "over", "lazy", "The", "fox", "the", "dog"]
  */

  // Этап 3. Возвращаем длину первого элемента в массиве 
  return longestWord[0].length; // var longestWord = ["jumped", "quick", "brown", "over", "lazy", "The", "fox", "the", "dog"];
                                // longestWord[0]="jumped" => jumped".length => 6
}

findLongestWord("The quick brown fox jumped over the lazy dog");

function findLongestWord(str) {
  var longestWord = str.split(' ').sort(function(a, b) { return b.length - a.length; });
  return longestWord[0].length;
}
findLongestWord("The quick brown fox jumped over the lazy dog");

[].reduce(function(previousValue, currentValue) {...}, “”);

function findLongestWord(str) {
  // Этап 1. Разбиваем строку на массив строк
  var strSplit = str.split(' ');
  // var strSplit = "The quick brown fox jumped over the lazy dog".split(' ');
  // var strSplit = ["The", "quick", "brown", "fox", "jumped", "over", "the", "lazy", "dog"];

  // Этап 2. Применяем метод reduce 
  var longestWord = strSplit.reduce(function(longest, currentWord) {
    if(currentWord.length > longest.length)
       return currentWord;
    Else
       return longest;
  }, "");

  /* Процесс уменьшения
  currentWord      longest       currentWord.length     longest.length    if(currentWord.length > longest.length)?   var longestWord
  "The"             ""                  3                     0                              yes                          "The"
  "quick"           "The"               5                     3                              yes                         "quick"
  "brown"           "quick"             5                     5                              no                          "quick"
  "fox"             "quick"             3                     5                              no                          "quick"
  "jumped"          "quick"             6                     5                              yes                         "jumped"
  "over"            "jumped"            4                     6                              no                          "jumped"
  "the"             "jumped"            3                     6                              no                          "jumped"
  "lazy"            "jumped"            4                     6                              no                          "jumped"
  "dog"             "jumped"            3                     6                              no                          "jumped"
  */

  // Этап 3. Возвращаем длину longestWord
  return longestWord.length; // var longestWord = "jumped" 
                             // longestWord.length => "jumped".length => 6
}

findLongestWord("The quick brown fox jumped over the lazy dog");

function findLongestWord(str) {
  var longestWord = str.split(' ').reduce(function(longest, currentWord) {
    return currentWord.length > longest.length ? currentWord : longest;
  }, "");
  return longestWord.length;
}
findLongestWord("The quick brown fox jumped over the lazy dog");