На практике, хотя для каждого элементарного типа есть соответствующий объект, использовать их не рекомендуется. Это - отмершая часть языка.
var ok = new Boolean(true) // не надо
Элементарные типы автоматически интерпретируются как объекты при вызовах методов, поэтому можно, определять длину строки как:
alert("Апельсин".length)
Поэтому иногда говорят, что в javascript - все объекты. Так удобно думать, но определенная разница все же есть.
Например, typeof выдаст разный результат:
alert(typeof "test")
alert(typeof new String("test"))
Это - еще одна причина избегать использования объектов там, где существует элементарный тип: меньше путаницы.
Преобразование типа можно явным образом сделать через его название:
var test = Boolean("something") // true
Кроме всем известных типов данных - в javascript есть специальное значение undefined, которое, условно говоря, обозначает что "данных нет". Не null, а данных нет. Понимайте как хотите.
Далее рассмотрим особенности каждого из этих типов.
При операциях с Number - никогда не происходят ошибки. Зато могут быть возвращены специальные значения:
1/0
Number.POSITIVE_INFINITY (плюс бесконечность)
-1/0
Number.NEGATIVE_INFINITY (минус бесконечность)
Number(“something”)
NaN (Not-a-Number, результат ошибочной операции)
Бесконечность бывает полезно использовать в обычном коде. Например, положительная бесконечность Number.POSITIVE_INFINITY больше любого Number, и даже больше самой себя.
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Вопросы по прочитанному. Именно по прочитанному, чтобы ответ на него помог другим разобраться в предмете статьи. Другие вопросы могут быть удалены. Для остальных вопросов и обсуждений есть форум.
P.S. Лучшее "спасибо" - не комментарий, как все здорово, а рекомендация или ссылка на статью.
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