03 December, 2024
Top Tips Of Renovate JavaScript-Developer-I Practice Exam
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Question 1
Considering type coercion, what does the following expression evaluate to? True + ‘13’ + NaN
Question 2
Refer to the code below:
Why does the function bar have access to variable a ?
Why does the function bar have access to variable a ?
Question 3
A test has a dependency on database. query. During the test, the dependency is replaced with an object called database with the method,
Calculator query, that returns an array. The developer does notneed to verify how many times the method has been called.
Which two test approaches describe the requirement? Choose 2 answers
Calculator query, that returns an array. The developer does notneed to verify how many times the method has been called.
Which two test approaches describe the requirement? Choose 2 answers
Question 4
A developer has two ways to write a function: Option A:
function Monster() { This.growl = () => { Console.log (“Grr!”);
}
}
Option B:
function Monster() {}; Monster.prototype.growl =() => { console.log(“Grr!”);
}
After deciding on an option, the developer creates 1000 monster objects. How many growl methods are created with Option AOption B?
function Monster() { This.growl = () => { Console.log (“Grr!”);
}
}
Option B:
function Monster() {}; Monster.prototype.growl =() => { console.log(“Grr!”);
}
After deciding on an option, the developer creates 1000 monster objects. How many growl methods are created with Option AOption B?
Question 5
Given the code below:
What is logged to the console?
What is logged to the console?
Question 6
Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions any that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
Which function can the developer use to obtain the time spent by every one of the three functions?
Which function can the developer use to obtain the time spent by every one of the three functions?
Question 7
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(‘Thetruck ${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.’?
}
}
Class Truck extends Vehicle { constructor(plate, weight) {
//Missing code This.weight = weight;
}
displayWeight() {
console.log(‘Thetruck ${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.’?
Question 8
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, UCdecides to implement a debounce function on string change handler.
What are three key steps to implement this debounce function? Choose 3 answers:
Address this problem, UCdecides to implement a debounce function on string change handler.
What are three key steps to implement this debounce function? Choose 3 answers:
Question 9
A developer is required to write a function that calculates the sum of elements in an
array but is getting undefinedevery time the code is executed. The developer needs to find what is missing in the code below.
Const sumFunction = arr => {
Return arr.reduce((result, current) => {
//
Result += current;
//
), 10);
);
Which option makes the code work as expected?
array but is getting undefinedevery time the code is executed. The developer needs to find what is missing in the code below.
Const sumFunction = arr => {
Return arr.reduce((result, current) => {
//
Result += current;
//
), 10);
);
Which option makes the code work as expected?
Question 10
A developer wrote the following codeto test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in thearray.
Which two results occur when running this test on the updated sum3 function? Choose 2 answers
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in thearray.
Which two results occur when running this test on the updated sum3 function? Choose 2 answers
Question 11
The developer wants to test the array shown: const arr = Array(5).fill(0)
Which two tests are the most accurate for this array ? Choose 2 answers:
Which two tests are the most accurate for this array ? Choose 2 answers:
Question 12
What is the result of the code block?
Question 13
A developer has the following array of student test grades: Let arr = [ 7, 8, 5, 8, 9 ];
The Teacher wants to double each score and then see an array of the students who scored more than 15 points.
How should thedeveloper implement the request?
The Teacher wants to double each score and then see an array of the students who scored more than 15 points.
How should thedeveloper implement the request?
Question 14
Refer to the code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this? Choose 2 answers
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this? Choose 2 answers
Question 15
A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?
A)
B)
C)
D)
What is the correct implementation of the try...catch?
A)
B)
C)
D)