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NEW QUESTION # 80
Given the code below:
01 function Person(name, email) {
02 this.name = name;
03 this.email = email;
04 }
05
06 const john = new Person('John', 'john@email.com');
07 const jane = new Person('Jane', 'jane@email.com');
08 const emily = new Person('Emily', 'emily@email.com');
09
10 let usersList = [john, jane, emily];
Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From JavaScript Knowledge:
We have an array of plain objects:
[
{ name: 'John', email: 'john@email.com' },
{ name: 'Jane', email: 'jane@email.com' },
{ name: 'Emily', email: 'emily@email.com' }
]
We want:
A "visual representation" of the list.
Ability to sort by name or email in DevTools.
console.table:
console.table(data) renders data as a table in most browser devtools and Node consoles that support it.
Each object becomes a row; properties (name, email) become columns.
Many DevTools UIs allow:
Clicking column headers to sort by that column.
Filtering / viewing in a structured way.
So:
console.table(usersList);
Displays a sortable table of users by name or email. This matches the requirement exactly.
Other options:
console.group(usersList);
Starts a console group. The argument is just logged as a line label.
It does not create a table or sortable view; it just groups subsequent logs.
console.groupCollapsed(usersList);
Same grouping behavior, but collapsed by default.
Again, no table or sortable columns.
console.info(usersList);
Logs the array in the console, but as a standard log/info.
You can expand objects, but there is no table view or built-in column sorting.
Therefore, the correct method is:
Study Guide / Concept Reference (no links):
console.table for tabular logging
console.group and console.groupCollapsed for grouped logs
console.log / console.info standard logging behavior
DevTools UI support for sorting columns in console.table
________________________________________
NEW QUESTION # 81
Refer to the code:
01 let car1 = new Promise((_, reject) =>
02 setTimeout(reject, 2000, "Car 1 crashed in"));
03 let car2 = new Promise(resolve =>
04 setTimeout(resolve, 1500, "Car 2 completed"));
05 let car3 = new Promise(resolve =>
06 setTimeout(resolve, 3000, "Car 3 completed"));
07
08 Promise.race([car1, car2, car3])
09 .then(value => {
10 let result = '$(value) the race.';
11 })
12 .catch(err => {
13 console.log("Race is cancelled.", err);
14 });
What is the value of result when Promise.race executes?
Answer: C
Explanation:
Promise.race() returns the result of the first settled promise, whether resolved or rejected.
The promises:
car1 β rejects in 2000 ms
car2 β resolves in 1500 ms
car3 β resolves in 3000 ms
The earliest settled promise is car2 (1500 ms), which resolves with the value:
"Car 2 completed"
Therefore, Promise.race enters the .then() branch with:
value = "Car 2 completed"
Inside the .then():
let result = '$(value) the race.';
This appears to attempt template substitution but uses incorrect syntax.
JavaScript template literals require backticks and ${expression}, for example:
`${value} the race.`
Because the code is incorrect, result is literally the string:
$(value) the race.
However, the question asks:
"What is the value of result when Promise.race executes?"
This refers to the intended value based on which promise wins the race, not the template bug.
The winning value is:
Car 2 completed
So the correct conceptual answer is:
Car 2 completed the race.
JavaScript Knowledge Reference (text-only)
Promise.race() returns the first settled (resolved or rejected) promise.
The earliest resolve here is car2 (1500 ms).
Incorrect template literal syntax does not affect the identity of the winning promise.
NEW QUESTION # 82
A developer has a fizzbuzz function that, when passed in a number, returns the following:
- 'fizz' if the number is divisible by 3.
- 'buzz' if the number is divisible by 5.
- 'fizzbuzz' if the number is divisible by both 3 and 5.
- empty string if the number is divisible by neither 3 or 5.
Which two test cases properly test scenarios for the fizzbuzz function?
Choose 2 answers
Answer: A,D
NEW QUESTION # 83
Refer to the following code block (with corrected template literals using backticks):
01 class Animal {
02 constructor(name) {
03 this.name = name;
04 }
05
06 makeSound() {
07 console.log(`${this.name} is making a sound.`);
08 }
09 }
10
11 class Dog extends Animal {
12 constructor(name) {
13 super(name);
14 this.name = name;
15 }
16 makeSound() {
17 console.log(`${this.name} is barking.`);
18 }
19 }
20
21 let myDog = new Dog('Puppy');
22 myDog.makeSound();
What is the console output?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Animal class:
Has a constructor that sets this.name.
Has a makeSound method that logs a message using this.name.
Dog class:
Extends Animal.
Its constructor calls super(name) to run the parent constructor, which sets this.name.
It overrides makeSound() to log:
console.log(`${this.name} is barking.`);
Instantiation:
let myDog = new Dog('Puppy');
myDog.makeSound();
new Dog('Puppy'):
Calls Dog constructor with name = 'Puppy'.
Inside, super(name) sets this.name = 'Puppy' in the Animal constructor.
Then this.name = name; in the Dog constructor keeps it as 'Puppy'.
myDog.makeSound():
Calls the overridden makeSound() in Dog.
Logs: "Puppy is barking."
No reference errors, no undefined; the output is:
Puppy is barking.
Study Guide Concepts:
ES6 classes and inheritance (extends)
super() in subclass constructors
Method overriding in subclasses
Template literals: `${this.name} ...`
________________________________________
NEW QUESTION # 84
A developer is leading the creation of a new browser application that will serve a single page application. The team wants to use a new web framework Minimalsit.js.The Lead developer wants to advocate for a more seasoned web framework that already has a community around it.
Which two frameworks should the lead developer advocate for?
Choose 2 answers
Answer: A,B
NEW QUESTION # 85
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