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| Section | Objectives |
|---|---|
| Asynchronous JavaScript | - Error handling in async workflows - Event loop and concurrency model - Promises and async/await |
| JavaScript Language Fundamentals | - Functions, scope, and closures - Data types, variables, and operators - ES6+ syntax and features |
| Testing and Debugging | - Unit testing principles - Debugging techniques and tools |
| Browser and DOM Interaction | - Browser APIs (fetch, storage, timers) - DOM manipulation and traversal - Event handling and propagation |
| Salesforce Platform Integration | - Calling Apex methods from JavaScript - Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage |
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NEW QUESTION # 38
Refer to the code below:
flag();
function flag() {
console.log( ' flag ' );
}
const anotherFlag = () = > {
console.log( ' another flag ' );
}
anotherFlag();
What is result of the code block?
Answer: B
Explanation:
Key points:
* Function declarations are hoisted (their definitions are available before the line where they appear).
* Function expressions assigned to const or let are not hoisted as callable functions, but here anotherFlag is only used after it is defined.
Step-by-step:
* flag(); at the top:
* flag is a function declaration defined later; due to hoisting, it is available.
* It logs ' flag ' .
* The declaration:
function flag() {
console.log( ' flag ' );
}
is already in effect (hoisted before execution).
* const anotherFlag = () = > { console.log( ' another flag ' ); } defines anotherFlag as an arrow function.
* anotherFlag(); is called after its definition; this is valid and logs ' another flag ' .
No errors occur. The console output is:
* flag
* another flag
So option D is correct.
Concepts: function hoisting, difference between function declarations and function expressions, execution order.
NEW QUESTION # 39
Given the code below:
01 function GameConsole (name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log( ` $(this.name) is loading a game : $(gamename) ...`);
07 )
08 function Console 16 Bit (name) {
09 GameConsole.call(this, name) ;
10 }
11 Console16bit.prototype = Object.create ( GameConsole.prototype) ;
12 //insert code here
13 console.log( ` $(this.name) is loading a cartridge game : $(gamename) ...`);
14 }
15 const console16bit = new Console16bit(' SNEGeneziz ');
16 console16bit.load(' Super Nonic 3x Force ');
What should a developer insert at line 15 to output the following message using the
method ?
> SNEGeneziz is loading a cartridge game: Super Monic 3x Force . . .
Answer: D
NEW QUESTION # 40
Given the JavaScript below:
Which code should replace the placeholder comment on line 06 to hide accounts that do not match the search string?
Answer: C
NEW QUESTION # 41
Refer to the code below:
01 let o = {
02 get js() {
03 let city1 = String( ' St. Louis ' );
04 let city2 = String( ' New York ' );
05
06 return {
07 firstCity: city1.toLowerCase(),
08 secondCity: city2.toLowerCase(),
09 }
10 }
11 }
What value can a developer expect when referencing o.js.secondCity?
Answer: B
Explanation:
1. Getter Functions in JavaScript
In JavaScript, when an object uses the get keyword, it defines a getter method . Accessing a getter property executes the function and returns its value. Thus:
o.js
does not return the getter function; instead, it executes the function located at:
get js() { ... }
and returns the object inside the return block.
2. Behavior of String() and toLowerCase()
Inside the getter:
let city1 = String( ' St. Louis ' );
let city2 = String( ' New York ' );
String() creates a string value.
Then, the returned object is constructed as:
{
firstCity: city1.toLowerCase(),
secondCity: city2.toLowerCase(),
}
The method toLowerCase() is a standard JavaScript string method that returns a new string with all alphabetic characters converted to lowercase .
Therefore:
city2.toLowerCase()
returns:
' new york '
3. Referencing the Property
When the developer writes:
o.js.secondCity
the following happens:
* The getter js runs and returns an object.
* The returned object includes the property:
secondCity: ' new york '
* Accessing .secondCity retrieves the lowercase string ' new york ' .
Therefore, the correct value is ' new york ' .
Why the Other Options Are Incorrect
A). undefined - incorrect because the property secondCity clearly exists in the returned object.
B). An error - incorrect because no invalid operations occur; all methods and properties are valid.
C). ' New York ' - incorrect because toLowerCase() transforms the string to lowercase.
JavaScript Knowledge References (Text-Based)
* Getter methods using the get keyword return computed values when accessed.
* JavaScript String values support the toLowerCase() method, which returns a lowercase version of the original string.
* Accessing nested properties like o.js.secondCity triggers the getter, returning the constructed object.
NEW QUESTION # 42
Refer to the code below:
01 const exec = (item, delay) =>{
02 new Promise(resolve => setTimeout( () => resolve(item), delay)),
03 async function runParallel() {
04 Const (result1, result2, result3) = await Promise.all{
05 [exec ('x', '100') , exec('y', 500), exec('z', '100')]
06 );
07 return `parallel is done: $(result1) $(result2)$(result3)`;
08 }
}
}
Which two statements correctly execute the runParallel () function?
Choose 2 answers
Answer: C,D
NEW QUESTION # 43
......
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