Free Certified JavaScript Developer I Exam Braindumps
Salesforce Certified JavaScript Developer I Questions 101–105 (page: 22)

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 tofollowing 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.'?