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NEW QUESTION # 40
Correct implementation of try...catch for countsDeep():
Answer: C
Explanation:
Errors thrown inside a setTimeout callback are asynchronous.
A try...catch around setTimeout (options C and D) can't catch errors thrown inside the callback later.
You must put the try...catch inside the timeout callback (option B).
A is nonsense syntax, D also calls countSheep() instead of countsDeep().
NEW QUESTION # 41
A developer wants to iterate through an array of objects and count the objects and count the objects whose property value, name, starts with the letterN.
Const arrObj = [{"name" : "Zach"} , {"name" : "Kate"},{"name" : "Alise"},{"name" : "Bob"},{"name" :
"Natham"},{"name" : "nathaniel"}
Refer to the code snippet below:
01 arrObj.reduce(( acc, curr) => {
02 //missing line 02
02 //missing line 03
04 ). 0);
Which missing lines 02 and 03 return the correct count?
Answer: D
NEW QUESTION # 42
Which three browser specific APIs are available for developers to persist data between page loads?
Answer: A,D,E
Explanation:
We want mechanisms that persist data between page loads (i.e., after refresh or navigation), in the browser.
A . localStorage
Part of the Web Storage API.
Data persists across page reloads and browser restarts (until explicitly cleared).
Scoped per origin (protocol + host + port).
This is a correct persistent storage API.
B . indexedDB
A low-level, client-side NoSQL database in the browser.
Stores large amounts of structured data and persists across reloads and sessions.
This is also a correct persistent API.
C . cookies
Small key/value pairs stored by the browser and often sent with HTTP requests.
Can have expiration dates and persist across page loads and sessions.
They are a traditional persistence mechanism in browsers.
So cookies also qualify.
D . global variables
Global JS variables exist only for the life of the current page context.
When the page is refreshed or navigated away, they are lost.
They do not persist between page loads.
E . IIFEs (Immediately Invoked Function Expressions)
A pattern for creating a new scope, not a persistence mechanism.
Variables inside an IIFE are still lost when the page reloads.
Thus, the three persistent browser APIs are:
localStorage
indexedDB
cookies
NEW QUESTION # 43
Given the code:
const copy = JSON.stringify([new String('false'), new Boolean(false), undefined]); What is the value of copy?
Answer: C
Explanation:
JSON.stringify() applies the following rules:
String objects (new String('false'))
Are converted to their primitive string values.
So:
new String("false") → "false"
Boolean objects (new Boolean(false))
Convert to their primitive boolean value:
new Boolean(false) → false
Undefined values inside arrays
According to the JSON specification, undefined becomes null when stringifying an array:
JSON.stringify([undefined]) → "[null]"
Therefore, the array becomes:
["false", false, null]
And JSON.stringify wraps it in quotes:
'["false", false, null]'
This is exactly option A.
JavaScript Knowledge Reference (text-only)
Object wrappers (String, Boolean) are converted to primitives during JSON serialization.
undefined becomes null inside arrays when stringified.
JSON.stringify() follows the JSON data-model rules strictly.
NEW QUESTION # 44
Refer to the code snippet:
01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03 if (array[i] === 4) {
04 array.splice(i, 1);
05 i--;
06 }
07 }
What is the value of array after the code executes?
Answer: A
Explanation:
Comprehensive and Detailed
The loop removes every 4:
Start: [1, 2, 3, 4, 4, 5, 4, 4]
i=0 → 1 (no change)
i=1 → 2 (no change)
i=2 → 3 (no change)
i=3 → 4 → splice removes index 3 → [1,2,3,4,5,4,4], then i-- → 2
Next loop, i=3 → 4 again → splice → [1,2,3,5,4,4], i-- → 2
i=3 → 5 (no change)
i=4 → 4 → splice → [1,2,3,5,4], i-- → 3
i=4 → 4 → splice → [1,2,3,5], i-- → 3
Next i=4, array.length is 4 → loop ends.
All 4s removed, final array: [1, 2, 3, 5].
________________________________________
NEW QUESTION # 45
......
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