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| Section | Objectives |
|---|---|
| JavaScript Language Fundamentals | - Data types, variables, and operators - ES6+ syntax and features - Functions, scope, and closures |
| Asynchronous JavaScript | - Event loop and concurrency model - Error handling in async workflows - Promises and async/await |
| Testing and Debugging | - Debugging techniques and tools - Unit testing principles |
| Salesforce Platform Integration | - Security considerations in Salesforce JavaScript - Calling Apex methods from JavaScript - Lightning Web Components (LWC) JavaScript usage |
| Browser and DOM Interaction | - DOM manipulation and traversal - Browser APIs (fetch, storage, timers) - Event handling and propagation |
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NEW QUESTION # 125
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 # 126
A developer removes the HTML class attribute from the checkout button, so now it is simply:
< button > Checkout < /button >
There is a test to verify the existence of the checkout button, however it looks for a button with class= " blue "
. The test fails because no such button is found.
Which type of test category describes this test?
Answer: B
Explanation:
Definitions in testing context (treating "positive" as "test reports a bug/failure"):
* True positive : System has a bug; test correctly fails.
* False positive : System is correct; test fails (reports a bug that isn't actually a bug).
* True negative : System has a bug; test correctly passes indicating "no success" in detection context (less common phrasing here).
* False negative : System has a bug; test incorrectly passes (missed bug).
Here:
* The real requirement , as stated, is to verify the existence of the checkout button .
* The button still exists ( < button > Checkout < /button > ), so the system behavior is correct regarding that requirement.
* The test, however, is checking for an overly specific condition (class= " blue " ), which is not actually part of the stated requirement.
* The test fails , saying there is a problem (no button with class= " blue " ), even though from the requirement standpoint, the checkout button is present.
So:
* No real bug concerning presence of checkout button.
* Test reports a failure # a false positive .
Therefore, the correct category is D, False positive.
NEW QUESTION # 127
A developer receives a comment from the Tech Lead that the code given below has error:
const monthName = 'July';
const year = 2019;
if(year === 2019) {
monthName = 'June';
}
Which line edit should be made to make this code run?
Answer: B
NEW QUESTION # 128
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: A
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 # 129
A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?
Answer: B
NEW QUESTION # 130
......
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