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NEW QUESTION # 14
Refer to the code:
const pi = 3.1415926;
What is the data type of pi?
Answer: A
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge JavaScript has one numeric data type for all real numbers, whether integers or decimals.
This type is simply called:
Number
It follows the IEEE 754 double-precision floating-point standard internally, but JavaScript does not expose separate types like float, double, or decimal.
Therefore:
It is not Float → JavaScript does not have float primitives.
It is not Double → this refers to the underlying IEEE 754 representation, but JavaScript's type is still just "Number." It is not Decimal → JavaScript has no built-in decimal type.
The correct answer is Number.
________________________________________
JavaScript Knowledge Reference (text-only)
JavaScript has a single numeric type: Number.
All numbers-integers, fractions, floating point-use the Number type.
NEW QUESTION # 15
Which three actions can the code execute in the browser console?
Answer: B,C,E
Explanation:
The browser console (Developer Tools → Console) allows:
Running code unrelated to the page
Developers can type arbitrary JavaScript not tied to the page's logic.
This is allowed → A is correct.
Viewing and modifying JavaScript code execution
Using the Sources tab and console, developers can:
Inspect variables
Modify code at runtime
Set breakpoints
Therefore → D is correct.
Viewing and manipulating the DOM
From the console, developers can:
Query DOM nodes using selectors
Modify element properties and attributes
Insert or remove elements
Therefore → E is correct.
Why the other options are incorrect:
B (security cookies)
Many cookies have flags such as HttpOnly and Secure.
Cookies with the HttpOnly flag cannot be viewed or modified via JavaScript or console.
Therefore this is not guaranteed → incorrect.
C (performance report)
The console itself does not provide a performance report.
The Performance or Lighthouse tabs provide this, not the console.
Therefore incorrect.
JavaScript Knowledge Reference (text-only)
Developer console can execute arbitrary JavaScript.
Console allows DOM inspection and manipulation.
Security cookies (HttpOnly) cannot be accessed via JavaScript.
NEW QUESTION # 16
HTML:
<p> The current status of an Order: <span id="status"> In Progress </span> </p> Which JavaScript statement changes 'In Progress' to 'Completed'?
Answer: D
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge To select an element by ID, JavaScript uses:
document.getElementById("status")
The ID must be passed without any selector prefixes (no dot, no hash).
Then, to update the text inside:
element.innerHTML = 'Completed';
Why the others are wrong:
A uses ".status" which would match a CSS class, not an ID.
B incorrectly prepends #, which is used in CSS selectors but not in getElementById.
D attempts to use .Value with capital V, which is incorrect for DOM text; .value only applies to form elements.
Thus, option C is correct.
________________________________________
JavaScript Knowledge Reference (text-only)
getElementById takes a raw ID string with no prefixes.
innerHTML updates an element's displayed HTML content.
NEW QUESTION # 17
developer uses the code below to format a date.
After executing, what is the value offormattedDate?
Answer: A
NEW QUESTION # 18
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 = '$(value) the race.';
11 })
12 .catch(err => {
13 console.log("Race is cancelled.", err);
14 });
What is the value of result when Promise.race executes?
Answer: B
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Promise.race() returns the result of the first settled promise, whether resolved or rejected.
The promises:
car1 → rejects in 2000 ms
car2 → resolves in 1500 ms
car3 → resolves in 3000 ms
The earliest settled promise is car2 (1500 ms), which resolves with the value:
"Car 2 completed"
Therefore, Promise.race enters the .then() branch with:
value = "Car 2 completed"
Inside the .then():
let result = '$(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 # 19
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