Question 1

Considering type coercion, what does the following expression evaluate to?True + '13' + NaN

Options :

A : ' 113Nan '

B : 14

C : ' true13 '

D : ' true13NaN '

Answer: D

Question 2

Which javascript methods can be used to serialize an object into a string and deserializea JSON string into an object, respectively?

Options :

A : JSON.stringify and JSON.parse

B : JSON.serialize and JSON.deserialize

C : JSON.encode and JSON.decode

D : JSON.parse and JSON.deserialize

Answer: A

Question 3

Teams at Universal Containers (UC) work on multiple JavaScript projects at the same time.UC is thinking about reusability and how each team can benefit from the work of others.Going open-source or public is not an option at this time.Which option is available to UC with npm?

Options :

A : Private packages can be scored, and scopes can be associated to a privateregistries.

B : Private registries are not supported by npm, but packages can be installed via URL.

C : Private packages are not supported, but they can use another package manager likeyarn.

D : Private registries are not supported by npm, but packages can be installed via git.

Answer: A

Question 4

Refer to the following code:class Vehicle{constructor(plate){this.plate = plate;}}class Truck extends Vehicle{constructor(plate, weight){//Missing codethis.weight = weight;}displayWeight(){console.log(`The truck ${this.plate} has a weight of ${this.weight}lb.`);}}let myTruck = new Truck('123Ab',5000);myTruck.displayWeight();Which statement should be added to missing code for the code to display 'The truck 123AB has aweight of 5000lb.

Options :

A : super(plate)

B : super.plate = plate

C : Vehicle.plate = plate

D : this.plate = plate

Answer: A

Question 5

Which statement can a developer apply to increment the browser's navigation history without a page refresh?

Options :

A : window.history.pushState(newStateObject);

B : window.history.pushStare(newStateObject, ' ', null);

C : window.history.replaceState(newStateObject,' ', null);

D : window.history.state.push(newStateObject);

Answer: C

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