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The Salesforce Certified JavaScript Developer (JS-Dev-101) certification is highly valued in the Salesforce community as it demonstrates a developer's ability to design and develop custom applications on the Salesforce platform using JavaScript. It is also an indication that the developer has a strong understanding of Salesforce's technical architecture and best practices for custom development.

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q98-Q103):

NEW QUESTION # 98
A developer wants to catch any error that countSheep() may throw and pass it to handleError().
Which implementation is correct?

A. setTimeout(function() {
try {
(Answer incomplete in option list.)
B. try {
countSheep();
} finally {
handleError(e);
}
C. try {
setTimeout(function() {
countSheep();
}, 1000);
}
catch (e) {
handleError(e);
}
D. try {
countSheep();
} handleError(e) {
catch(e);
}

Answer: C

Explanation:
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 References (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 # 99
Universal Container (UC) notices that its application allows users to search for account makes a network request each time a key is pressed. This results in too many request for the server to handle.
O address this problem, UC decides to implement a deboune function on the search string change handler. Choose 3 answers

A. When the search string changes, enqueue the request within a setTimeout.
B. If the there is an existing setTimeout and the search string changes, cancel the existing setTimeout using the persisted timeout replace it with a new setTimeout.
C. Store the timeId of the setTimeout last enqueued by the search string change handler.
D. Ensure that the network request has the property debounce set to true,
E. If there is an existing settimeout and the search string changes, allow the existing setTimeout to finish, and do not enqueue a settimeout.

Answer: A,B,D

NEW QUESTION # 100
A developer copied a JavaScript object:

How does the developer access dan's forstName,lastName? Choose 2 answers

A. dan,name ( )
B. dan,firstname ( ) + dan, lastName ( )
C. dan, firstName = dan.lastName
D. dan,name

Answer: A,C

NEW QUESTION # 101
Refer to the following code:

A. Outer message
Inner message
B. Inner message
Outer message
C. Outer message
D. Button message

Answer: D

NEW QUESTION # 102
A team that works on a big project uses npm to deal with projects dependencies.
A developer added a dependency does not get downloaded when they execute npm install.
Which two reasons could be possible explanations for this?
Choose 2 answers

A. The developer missed the option --save when adding the dependency.
B. The developer missed the option --add when adding the dependency.
C. The developer added the dependency as a dev dependency, and
NODE_ENV
Is set to production.
D. The developer added the dependency as a dev dependency, and
NODE_ENV is set to production.

Answer: A,C,D

NEW QUESTION # 103
......

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