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Advanced Frontend with React.js [Eng+Ukr]

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Which keyword(s) is (are) required for ES6 Class definition?

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Which of the above concepts are best practices in software development?

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Which of the following statements about polymorphism are correct?

polymorphism does not promote code reuse

❌

all of

the listed

❌

t provides an ability to call the same method on different

JavaScript objects

✅

polymorphism

is achieved through abstraction

❌

polymorphism often uses inheritance

✅

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How can you natively implement private data in JavaScript? (please, consider the latest proposals in this direction)

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For the given source code, you need to implement the IT_specialist constructor function, which takes 3 parameters: fullName, position, salary and prototypically inherits from Employee. Indicate which of the prototypal inheritance implementations is correct.

none

of the listed

❌

function IT_specialist(fullName, position, salary) {

Employee.call(this, fullName,

position);

this.salary =

salary;

}

IT_specialist.prototype = Object.create(Employee.prototype);

✅

function IT_specialist(fullName,

position, salary) {

Employee.call(this, fullName,

position);

this.salary =

salary;

}

IT_specialist.prototype = Object.create(Employee);

❌

function IT_specialist(fullName,

position, salary) {

this.fullName = fullName;

this.position = position;

this.salary =

salary;

}

IT_specialist.prototype =

Employee;

❌

function IT_specialist(fullName,

position, salary) {

Employee.call(this, fullName,

position);

this.salary =

salary;

}

IT_specialist.prototype =

Employee.prototype;

❌

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The given Shape class has two private properties, _width and _height. Can we access them, modify them outside the Shape class?

yes

✅

❌

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Which of the following implementations of the IT_specialist child class constructor is correct? The constructor accepts 4 parameters: fullName, position, experience, salary.