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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I - Multiple Choice Exam (JS-Dev-101) |
| Exam Number: | JS-Dev-101 |
| Exam Duration: | 105 minutes |
| Certificate Validity Period: | 1 year (maintenance required annually in Salesforce certification program) |
| Related Certifications: | Salesforce Platform Developer II Salesforce Platform Developer I |
| Exam Format: | Multiple Choice Questions, Multiple Select Questions |
| Real Exam Qty: | 60 (multiple choice) |
| Exam Price: | $200 USD |
| Passing Score: | 65% |
| Available Languages: | English |
| Recommended Training: | MDN Web Docs - JavaScript Guide Salesforce Trailhead - JavaScript Developer I |
| Exam Registration: | Salesforce Certification Registration Kryterion Webassessor (Exam Delivery) |
| Sample Questions: | Salesforce JS-Dev-101 Sample Questions |
| Exam Way: | Online proctored exam via Salesforce authorized testing platform (e.g., Webassessor) |
| Pre Condition: | No formal prerequisites, but familiarity with JavaScript and web development is recommended. |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascriptdeveloper |
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NEW QUESTION # 105
Refer to the code below:
01 <html lang="en">
02 <table onclick="console.log('Table log');">
03 <tr id="row1">
04 <td>Click me!</td>
05 </tr>
06 </table>
07 <script>
08 function printMessage(event) {
09 console.log('Row log');
10 event.stopPropagation();
11 }
12
13 let elem = document.getElementById('row1');
14 elem.addEventListener('click', printMessage, false);
15 </script>
16 </html>
Which code change should be done for the console to log the following when "Click me!" is clicked?
Row log
Table log
Answer: C
Explanation:
Current behavior:
Clicking <td> triggers the click event on row1, then bubbles up to <table>.
printMessage runs, logs "Row log", then event.stopPropagation() stops the event from bubbling to the table.
So "Table log" never appears.
To allow the table's inline onclick to run after the row handler:
Remove the propagation stop:
function printMessage(event) {
console.log('Row log');
// event.stopPropagation(); // remove this
}
Now the event bubbles:
printMessage logs "Row log".
The table's onclick runs, logging "Table log".
Option A only changes capture/bubble phase but still stops propagation. C does nothing meaningful (stopPropagation takes no arguments). B removes the row handler entirely.
NEW QUESTION # 106
Refer to the code below:
01 let country = {
02 get capital() {
03 let city = Number("London");
04
05 return {
06 cityString: city.toString(),
07 }
08 }
09 }
Which value can a developer expect when referencing country.capital.cityString?
Answer: C
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge In the getter:
let city = Number("London");
The Number() constructor attempts to convert the string "London" into a numeric value.
"London" is not a valid numeric string.
When JavaScript attempts numeric conversion of a non-numeric string:
Number("London") → NaN
Next line:
city.toString()
When city is NaN, calling .toString() yields:
NaN.toString() → "NaN"
The getter returns:
{
cityString: "NaN"
}
The question asks:
Which value can a developer expect?
The multiple-choice options include NaN, but not "NaN".
Given the available choices, the intended correct answer is B (NaN) because the root cause is the Number("London") conversion returning NaN.
________________________________________
JavaScript Knowledge Reference (text-only)
Number(nonNumericString) returns NaN.
NaN.toString() produces "NaN".
Getters compute and return their values each time the property is accessed.
NEW QUESTION # 107
01 function Monster() { this.name = 'hello'; };
02 const m = Monster();
What happens due to the missing new keyword?
Answer: A
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge In JavaScript, when calling a constructor function without new:
const m = Monster();
the following happens:
The function executes as a normal function, not as a constructor.
Inside a regular function (in non-strict mode), this refers to the global object:
In a browser: window
So the line:
this.name = 'hello';
becomes:
window.name = 'hello';
Since Monster() does not return anything, its return value is undefined:
const m = undefined;
Therefore:
m is undefined
window.name becomes "hello"
This matches option B.
________________________________________
JavaScript Knowledge Reference (text-only)
Calling a function without new uses the global object as this in non-strict mode.
Constructor functions must use new to create a new object.
Functions without an explicit return return undefined.
NEW QUESTION # 108
developer wants to use a module named universalContainersLib and them callfunctions from it.
How should a developer import every function from the module and then call the functions foo and bar ?
Answer: D
NEW QUESTION # 109
Refer to the code:
01 const exec = (item, delay) =>
02 new Promise(resolve => setTimeout(() => resolve(item), delay));
03
04 async function runParallel() {
05 const [result1, result2, result3] = await Promise.all(
06 [exec('x', '100'), exec('y', '500'), exec('z', '100')]
07 );
08 return `parallel is done: ${result1}${result2}${result3}`;
09 }
Which two statements correctly execute runParallel()?
Answer: B,C
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Facts about JavaScript Promises:
runParallel() is declared async, which means it always returns a Promise.
Promises are consumed using .then(), .catch(), and .finally().
There is no .done() method in native JavaScript Promises.
The async keyword cannot be placed before a function call (option A is invalid syntax).
Analysis of each option:
A . async runParallel().then(data);
Invalid syntax. async cannot prefix an expression.
B . Valid. Calls the function and attaches a .then() handler.
C . Invalid. .done() is not part of JavaScript Promise API.
D . Valid. Calls runParallel() and chains .then().
Therefore the correct answers are B and D.
________________________________________
JavaScript Knowledge Reference (text-only)
async functions return Promises.
Promises use .then() to retrieve resolved values.
.done() is not part of the standard Promise interface.
NEW QUESTION # 110
......
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