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Consider the following class definition:
class Book {
constructor ({isbn, title, languages}) {
this.isbn = isbn;
this.title = title;
this.languages= languages;
}
...
}
Which of the following expressions represent a correct invocation
of the Book constructor? Select one or many:
☐
let b = new Book("006251587X", "Weaving the Web", [1,3]);☐
let b = new Book({"006251587X", "Weaving the Web",
[LanguageEL.DE,LanguageEL.FR]});☐
let b = new Book({isbn:"006251587X", title:"Weaving the Web",
languages:[1,3]});☐
let b = new Book({
isbn: "006251587X",
title: "Weaving the Web",
languages: [LanguageEL.DE, LanguageEL.FR]
});Which of the following code fragments represent correct definitions of a class with implicit getters/setters such that in the constructor, implicit setters are invoked? Select one or many:
☐
class Book {
constructor (i) {setIsbn(i);}
get isbn() {return this._isbn;}
set isbn(i) {this._isbn = i;}
}☐
class Book {
constructor (i) {this.isbn = i;}
get isbn() {return this._isbn;}
set isbn(i) {this._isbn = i;}
}☐
class Book {
constructor (i) {this.isbn = i;}
get isbn() {return this.isbn;}
set isbn(i) {this.isbn = i;}
}☐
class Book {
constructor (i) {this._isbn = i;}
get isbn() {return this._isbn;}
set isbn(i) {this._isbn = i;}
}Consider the following HTML select element:
<select name="languages" multiple="multiple">
<option value="en">English</option>
<option value="fr">French</option>
<option value="de">German</option>
</select>
Which of the following expressions represent a correct invocation
of the Book constructor? Select one:
O
document.getElementsByName("languages")[0].optionsO
document.getElementsByName("languages")[0].valueO
document.getElementsByName("languages")[0].selectedOptions