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Preparing for the Salesforce JavaScript-Developer-I certification exam requires a deep understanding of the topics covered in the exam. Salesforce provides a variety of study materials including online courses, trailhead modules, and documentation. Additionally, there are many third-party resources available to help you prepare for the exam including study guides, practice exams, and training courses.
To pass the Salesforce JavaScript-Developer-I exam, you must have a deep understanding of JavaScript and its related technologies, as well as a solid understanding of the Salesforce platform. You will be tested on your ability to design, develop, test, and deploy custom applications that meet the specific needs of your clients. JavaScript-Developer-I Exam consists of 60 multiple-choice questions and you have 105 minutes to complete it. Upon passing the exam, you will receive the Salesforce Certified JavaScript Developer I credential, which will demonstrate your expertise in JavaScript development on the Salesforce platform.
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To become a Salesforce Certified JavaScript Developer, individuals must pass the JavaScript-Developer-I Certification Exam. JavaScript-Developer-I exam is designed to test a developer's knowledge of JavaScript programming, web development, and the Salesforce Lightning platform. JavaScript-Developer-I Exam consists of 60 multiple-choice questions and has a time limit of 105 minutes.
NEW QUESTION # 97
A developer is debugging a web server that uses Node.js The server hits a runtimeerror every third request to an important endpoint on the web server.
The developer added a break point to the start script, that is at index.js at he root of the server's source code. The developer wants to make use of chrome DevTools to debug.
Which command can be run to access DevTools and make sure the breakdown is hit ?
Answer: A
NEW QUESTION # 98
Which statement accurately describes an aspect of promises?
Answer: A
NEW QUESTION # 99
Which actions can be done using the JavaScript browser console?
Answer: E
Explanation:
The correct answer is B because the JavaScript browser console allows developers to interact with the current web page using JavaScript commands. Through the console, you can access the document object, inspect DOM elements, read their properties, and modify the structure or content of the page.
For example:
document.body.style.backgroundColor = " lightblue " ;
This changes the page's background color.
Another example:
document.querySelector( " h1 " ).textContent = " Updated Heading " ;
This changes the text of the first < h1 > element on the page.
The DOM , or Document Object Model, is the browser's JavaScript representation of the HTML page. Since the console runs JavaScript in the context of the current page, it can be used to inspect and modify DOM elements directly.
Why the other options are incorrect:
A is not the best answer because although you can type general JavaScript expressions in the console, the browser console is mainly connected to the current page's execution environment. The question is asking about practical browser-console actions related to a page.
C is incorrect because performance reports are usually generated through tools such as the Performance panel or Lighthouse in browser developer tools, not directly through the JavaScript console.
D is incorrect because the console can modify the DOM and runtime values, but it does not permanently change the original JavaScript source code of the page. Any changes made through the console are temporary and disappear when the page reloads.
E is incorrect because security-protected cookies, such as HttpOnly cookies, cannot be viewed or changed using JavaScript. This is an intentional browser security feature that prevents client-side scripts from accessing sensitive cookie data.
Therefore, the best verified answer is B .
NEW QUESTION # 100
Refer to the code below (corrected to use a template literal on line 08):
01 let car1 = new Promise((_, reject) = >
02 setTimeout(reject, 2000, " Car 1 crashed in " )
03 );
04 let car2 = new Promise(resolve = >
05 setTimeout(resolve, 1500, " Car 2 completed " )
06 );
07 let car3 = new Promise(resolve = >
08 setTimeout(resolve, 3000, " Car 3 completed " )
09 );
10
11 Promise.race([car1, car2, car3])
12 .then(value = > {
13 let result = `${value} the race.`;
14 })
15 .catch(err = > {
16 console.log( " Race is cancelled. " , err);
17 });
What is the value of result when Promise.race executes?
Answer: D
Explanation:
Understand the three promises:
* car1:
let car1 = new Promise((_, reject) = >
setTimeout(reject, 2000, " Car 1 crashed in " )
);
* Rejects after 2000 ms (2 seconds) with message " Car 1 crashed in " .
* car2:
let car2 = new Promise(resolve = >
setTimeout(resolve, 1500, " Car 2 completed " )
);
* Resolves after 1500 ms (1.5 seconds) with message " Car 2 completed " .
* car3:
let car3 = new Promise(resolve = >
setTimeout(resolve, 3000, " Car 3 completed " )
);
* Resolves after 3000 ms (3 seconds) with message " Car 3 completed " .
Promise.race:
Promise.race([car1, car2, car3])
then(value = > {
let result = `${value} the race.`;
})
catch(err = > {
console.log( " Race is cancelled. " , err);
});
Behavior of Promise.race:
* It settles (resolves or rejects) as soon as any of the given promises settles.
* It uses the value or reason from the first settled promise.
Timing:
* car2 resolves in 1500 ms.
* car1 rejects in 2000 ms.
* car3 resolves in 3000 ms.
The first to settle is car2 at 1500 ms, with value " Car 2 completed " .
Therefore:
* Promise.race resolves (not rejects) with value = " Car 2 completed " .
* The .then handler runs; .catch is ignored because there is no rejection.
Inside .then:
let result = `${value} the race.`;
Substitute value:
let result = " Car 2 completed the race. " ;
So, result becomes:
Car 2 completed the race.
Compare to options:
* A. Car 3 completed the race.
* This would be correct if car3 were the first to resolve, which it is not (it resolves last).
* B. Car 2 completed the race.
* Exactly matches the first-resolving promise and the constructed message.
* C. Race is cancelled.
* This is the prefix of the string logged in the .catch handler, but .catch never runs because the race resolves, it does not reject first.
* D. Car 1 crashed in the race.
* car1 is the first rejection , but since a resolution from car2 happens earlier, the race is already settled successfully before car1 rejects.
Thus the correct value of result as set in the .then block is:
The answer: B
Study Guide / Concept References (no links):
* Promise.race(iterable) semantics (first settled promise wins)
* setTimeout and timing interactions with Promises
* Resolve vs reject paths and .then / .catch
* Template literals and string interpolation for building result messages
NEW QUESTION # 101
Refer to the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));
When does Promise.finally on line 08 get called?
Answer: A
NEW QUESTION # 102
......
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