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| Section | Objectives |
|---|---|
| Browser and DOM Interaction | - DOM Manipulation - Events and Event Handling |
| Object-Oriented JavaScript | - Objects and Prototypes - Classes and Inheritance |
| Asynchronous Programming | - Callbacks, Promises, and Async/Await - API Calls and Data Fetching |
| Salesforce Platform Integration | - Working with Salesforce Data Models - Lightning Web Components (LWC) Basics |
| JavaScript Fundamentals | - Functions and Scope - Control Flow and Error Handling - Variables, Data Types, and Operators |
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NEW QUESTION # 42
Most accurate tests for:
const arr = Array(5).fill(0);
Answer: B,D
Explanation:
The correct answers are C and D.
The statement:
const arr = Array(5).fill(0);
creates an array with 5 elements, and every element is filled with the value 0.
So the array becomes:
[0, 0, 0, 0, 0]
A professional test should verify both important expectations:
arr.length === 5
and:
each element === 0
Option C is correct because it checks every element in the array:
arr.forEach(e => console.assert(e === 0));
This confirms that each array element was filled with 0.
Option D is correct because it checks the array length:
console.assert(arr.length === 5);
This confirms that the array contains exactly five elements.
Option A is incorrect because the array length is not 0; it is 5.
Option B is incorrect for two reasons. First, arr[5] is outside the valid index range. The valid indexes are:
0, 1, 2, 3, 4
So:
arr[5]
returns:
undefined
Second, arr.length === 0 is false because the length is 5.
Therefore, the verified answers are C and D.
NEW QUESTION # 43
Given the following code:
Let x =null;
console.log(typeof x);
What is the output of the line 02?
Answer: C
NEW QUESTION # 44
A developer copied a JavaScript object:
01 function Person() {
02 this.firstName = "John";
03 this.lastName = "Doe";
04 this.name = () => `${this.firstName},${this.lastName}`;
05 }
06
07 const john = new Person();
08 const dan = Object.assign({}, john);
09 dan.firstName = 'Dan';
How does the developer access dan's firstName, lastName?
Answer: B
Explanation:
Person instances have:
firstName and lastName as string properties.
A name method that returns a combined string: `${this.firstName},${this.lastName}`.
Object.assign({}, john) creates a shallow copy of john into a new object, dan.
After:
dan.firstName = 'Dan';
dan.name() returns "Dan,Doe".
Analysis of options:
A: dan.firstName() and dan.lastName() are function calls, but firstName/lastName are strings, not functions โ TypeError.
B: Calls the defined method and uses both names correctly.
C: dan.name is a function reference; you'd still need to call it: dan.name().
D: dan.firstName + dan.lastName is "DanDoe", no separator. It accesses the properties but not in the method the developer defined.
The intended way, using the provided API, is dan.name().
NEW QUESTION # 45
Refer to the code below:
const searchText = 'Yay! Salesforce is amazing!';
let result1 = searchText.search(/sales/i);
let result2 = searchText.search(/sales/);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?
Answer: D
Explanation:
String: "Yay! Salesforce is amazing!"
Index positions:
'Y' at 0, 'a' at 1, 'y' at 2, '!' at 3, space at 4, 'S' at 5, 'a' at 6, 'l' at 7, 'e' at 8, 's' at 9, etc.
Substring "Sales" starts at index 5.
String.prototype.search with a regex returns the index of the first match or -1 if there is no match.
searchText.search(/sales/i);
/sales/i is case-insensitive because of the i flag.
It matches "Sales" beginning at index 5.
So result1 is 5.
searchText.search(/sales/);
/sales/ is case-sensitive.
It requires lowercase "sales".
The text has "Sales" with uppercase S, so this does not match.
search returns -1 when there is no match.
So result2 is -1.
Console output:
First log: 5
Second log: -1
Option D matches this.
Concepts: regex search, case sensitivity vs i flag, String.prototype.search return values.
NEW QUESTION # 46
A developer wants to catch any error that countSheep() may throw and pass it to handleError().
Which implementation is correct?
Answer: B
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Key JavaScript knowledge:
try...catch catches synchronous errors that occur inside the try block.
Errors thrown asynchronously (e.g., inside a timer callback) cannot be caught by surrounding synchronous try...catch unless the try...catch is inside the callback.
Option A places countSheep() inside the callback but the try...catch is outside the asynchronous function.
However, this is the only syntactically valid answer among the provided choices.
Since the question wants the correct structure based on options provided, A is the only complete and valid try...catch.
Options B, C, and D are syntactically invalid:
B: finally always executes but does not catch the error. Also uses an undefined variable e.
C: Does not follow valid JavaScript grammar.
D: The provided option is incomplete and cannot be correct.
Thus, A is the only valid surrounding structure in the provided choices.
________________________________________
JavaScript Knowledge Reference (text-only)
try...catch syntax must be correctly structured.
finally does not catch errors.
try { } catch (e) { } is valid only when complete and correctly ordered.
NEW QUESTION # 47
......
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