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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q126-Q131):

NEW QUESTION # 126
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?

A. New Promise((resolve, reject) => (throw 'cool error here'}).catch(error => console.error(error)) ;
B. New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error)));
C. Promise.reject('cool error here').then(error => console.error(error));
D. Promise.reject('cool error here').catch(error => console.error(error));

Answer: A,D

NEW QUESTION # 127
Refer to the code below:
Function Person(firstName, lastName, eyecolor) {
this.firstName =firstName;
this.lastName = lastName;
this.eyeColor = eyeColor;
}
Person.job = 'Developer';
const myFather = new Person('John', 'Doe');
console.log(myFather.job);
What is the output after the code executes?

A. ReferenceError: assignment to undeclared variable "Person"
B. ReferenceError: eyeColor is not defined
C. Developer
D. Undefined

Answer: D

NEW QUESTION # 128
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.'?

A. Super.plate =plate;
B. Vehicle.plate = plate;
C. This.plate =plate;
D. super(plate);

Answer: D

NEW QUESTION # 129
A developer writers the code below to calculate the factorial of a given number.
Function factorial(number) {
Return number + factorial(number -1);
}
factorial(3);
What is the result of executing line 04?

A. 0
B. RuntimeError
C. 1
D. -Infinity

Answer: B

NEW QUESTION # 130
A developer wrote the following code:
01 let X = object.value;
02
03 try {
04 handleObjectValue(X);
05 } catch (error) {
06 handleError(error);
07 }
The developer has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs.
How can the developer change the code to ensure this behavior?

A. 03 try {
04 handleObjectValue(x)
05 ........................
B. 03 try{
04 handleObjectValue(x);
05 } catch(error){
06 handleError(error);
07 } finally {
08 getNextValue();
10 }
C. 03 try{
04 handleObjectValue(x);
05 } catch(error){
06 handleError(error);
07 } then {
08 getNextValue();
09 }
D. 03 try{
04 handleObjectValue(x);
05 } catch(error){
06 handleError(error);
07 }
08 getNextValue();

Answer: A

NEW QUESTION # 131
......

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