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| Section | Objectives |
|---|---|
| Topic 1: Testing and Debugging | - Debugging techniques and tools - Unit testing principles |
| Topic 2: Salesforce Platform Integration | - Lightning Web Components (LWC) JavaScript usage - Security considerations in Salesforce JavaScript - Calling Apex methods from JavaScript |
| Topic 3: Browser and DOM Interaction | - Event handling and propagation - DOM manipulation and traversal - Browser APIs (fetch, storage, timers) |
| Topic 4: Asynchronous JavaScript | - Promises and async/await - Event loop and concurrency model - Error handling in async workflows |
| Topic 5: JavaScript Language Fundamentals | - ES6+ syntax and features - Functions, scope, and closures - Data types, variables, and operators |
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NEW QUESTION # 42
Refer to the code below:
Let textvalue = '1984';
Which code segment shows a correct way to convert this string to an integer?
Answer: B
NEW QUESTION # 43
Given the JavaScript below:
01 function filterDOM (searchString) {
02 const parsedSearchString = searchString && searchString.toLowerCase() ;
03 document.quesrySelectorAll(' .account' ) . forEach(account => (
04 const accountName = account.innerHTML.toLOwerCase();
05 account. Style.display = accountName.includes(parsedSearchString) ? /*Insert
code*/;
06 )};
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do
not match the search string?
Answer: B
NEW QUESTION # 44
A class was written to represent items for purchase in an online store, and a second class Representing items that are on sale at a discounted price. THe constructor sets the name to the first value passed in. The pseudocode is below:
Class Item {
constructor(name, price) {
... // Constructor Implementation
}
}
Class SaleItem extends Item {
constructor (name, price, discount) {
...//Constructor Implementation
}
}
There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem.
Let regItem =new Item('Scarf', 55);
Let saleItem = new SaleItem('Shirt' 80, -1);
Item.prototype.description = function () { return 'This is a ' + this.name; console.log(regItem.description()); console.log(saleItem.description()); SaleItem.prototype.description = function () { return 'This is a discounted ' + this.name; } console.log(regItem.description()); console.log(saleItem.description()); What is the output when executing the code above ?
Answer: C
NEW QUESTION # 45
Refer to the code:
Given the code above, which three properties are set pet1?
Choose 3 answers:
Answer: B,C,E
NEW QUESTION # 46
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: D
Explanation:
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 References (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 # 47
......
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