JavaScript
06. Wrapper objects in Javascript
Javascript provides many concepts under the hood. You may be using it without knowledge of its existence. Wrapper objects are one concept like that.
We know that javascript is object-oriented and we can create instances of objects and invoke it’s functions.
class Cat {
sound = () => console.log('Meow...')
}
const cat = new Cat();
cat.sound(); // Meow...
In the above example, you can see that the Cat is a class that is a constructor function and you can call its method `sound()` by creating a variable.
Also if you could notice, you can invoke functions of string by just declaring it.
const aboutMe = "My name is: John";
const name = aboutMe.split(':')[1].trim();
const length = 'Hi there'.length();
You can see that in the above example the strings are not objects, but it inherits properties and methods of a `String` class. How does it happen?
This happens in Wrapper classes. It will create an object with `new String(str)` and then resolve the methods or properties when you access it. After that, it will be discarded. Same happens with `Object()` `Array`, `Function`, `Number()` `Boolean()` classes. The `null` and `undefined` values don’t have any wrapper classes
You can see this by the following example:
const str = 'Hi there'; str.myProperty = 'John' console.log(str.myProperty); // prints undefined
From this, we can derive it doesn’t refer to any object but rather it will create an object for certain property or method is accessed from the string literal. These objects are what we refer to as Wrapper objects.
Equality of Wrapper Objects
You can create objects out of Wrapper classes when necessary. They will be converted to primitive values when needed. The object and its value can be compared for equality but they would not be strictly equal to each other.
const str = 'Hello'
const num = 12.2;
strObj = new String('Hello')
numObj = new Number(12.2)
strObj === str // false
strObj == str // true
numObj === num // false
numObj == num // true
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Află ce sunt pentru a le integra în dieta ta de slăbire.
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Boabele de cafea verde contribuie, de asemenea, la imbunatatirea muschilor.
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Fiecare zi a început cu faptul că m-am simțit obosit, pasivă
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L-tianina. Are un efect benefic asupra sistemului nervos uman. Ei vă pot spune
mai multe despre compoziție și orice efecte secundare potențiale,
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Hai să vedem mai jos principalele puncte
pro și principalele puncte contra despre produs. ReduSlim pe
forum – gasim un forum dedicat pentru produs? Este un produs uimitor care m-a ajutat nu numai să mă simt mai bine, ci
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Multumita actiunii trifazice a medicamentului, pierderea in greutate se va produce
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Black Latte este dezvoltata de specialisti americani, si, este un mod simplu si convenabil de
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Cumpărarea direct de la producător vă asigură autenticitatea produsului și vă permite să beneficiați de eventuale oferte sau promoții speciale.
Pretul produsului variaza pe site-ul online, asa ca va recomandam sa il achizitionati de
la distribuitorul original. Lipsa unor contraindicații
importante face să fie posibilă administrarea produsului Reduslim la aproape orice fel de persoană.
Modul sau de utilizare este foarte simplu, ar trebui sa luati doar o tableta
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Desigur, predispozitia dvs. genetica si exercitiul corect ales
vor afecta rezultatele, dar in cea mai mare parte rezultatele medii apar dupa prima luna de utilizare.
Reduslim este soluția perfectă pentru cei care vor să se pună
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Pentru rezultatele excelente ale actiunilor sale, este responsabilitatea ingredientelor
naturale combinate in proportiile potrivite. Toate preparatele
care conțin ingrediente naturale 100% nu generează toxicitate asupra organismului și nu au
reacții adverse. Ați cântărit vreodată că puteți slăbi
în mod natural și ușor? In timp, rezistenta corpului
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Seminte de chia – Acesta este un alt ingredient natural, care iti reincarca
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verzi: un antioxidant puternic cu proprietati tonice,
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Senna. Curata usor intestinele, elimina toxinele.
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