Salesforce Certified JavaScript Developer I Practice Test - Questions Answers, Page 11

A developer is wondering whether to use, Promise.then or Promise.catch, especially when a Promise throws an error?

Which two promises are rejected?

Which 2 are correct?

Refer to code below:

function Person() {

this.firstName = 'John';

}

Person.prototype ={

Job: x => 'Developer'

};

const myFather = new Person();

const result =myFather.firstName + ' ' + myFather.job();

What is the value of the result after line 10 executes?

Universal Containers (UC) notices that its application that allows users to search for accounts makes a network request each time a key is pressed. This results in too many requests for the server to handle.

• Address this problem, UC decides to implement a debounce function on string change handler.

What are three key steps to implement this debounce function?

Choose 3 answers:

Refer to the following object:

const cat ={

firstName: 'Fancy',

lastName: ' Whiskers',

Get fullName() {

return this.firstName + ' ' + this.lastName;

}

};

How can a developer access the fullName property for cat?

Refer to following code:

class Vehicle {

constructor(plate) {

This.plate =plate;

}}

Class Truck extends Vehicle {

constructor(plate, weight) {

//Missing code

This.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 line 09 for the code to display 'The truck 123AB has a weight of 5000lb.'?

Which option is a core Node,js module?

Refer to the code snippet below:

Let array = [1, 2, 3, 4, 4, 5, 4, 4];

For (let i =0; i < array.length; i++){

if (array[i] === 4) { array.splice(i, 1);

}

}

What is the value of the array after the code executes?

Which option is true about the strict mode in imported modules?

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?