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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Available Languages: | English |
| Exam Price: | $200 USD |
| Certificate Validity Period: | Lifetime (No renewal required) |
| Passing Score: | 65% |
| Exam Format: | Multiple Select, Multiple Choice |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Related Certifications: | Salesforce Certified JavaScript Developer I Lightning Web Components Specialist Superbadge |
| Exam Duration: | 105 minutes |
| Sample Questions: | Salesforce JS-Dev-101 Sample Questions |
| Exam Way: | Online (Proctored) |
| Pre Condition: | Completion of the Lightning Web Components Specialist Superbadge is required to earn the full credential, though it can be completed before or after the exam. |
| Official Syllabus URL: | https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi |
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NEW QUESTION # 40
Which three statements are true about promises ?
Choose 3 answers
Answer: B,C,D
NEW QUESTION # 41
Refer to the following code:
<html lang="en">
<body>
<divonclick = "console.log('Outer message') ;">
<button id ="myButton">CLick me<button>
</div>
</body>
<script>
function displayMessage(ev) {
ev.stopPropagation();
console.log('Inner message.');
}
const elem = document.getElementById('myButton');
elem.addEventListener('click' , displayMessage);
</script>
</html>
What will the console show when the button is clicked?
Answer: A
NEW QUESTION # 42
01 function Monster() { this.name = 'hello'; };
02 const m = Monster();
What happens due to the missing new keyword?
Answer: D
Explanation:
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 # 43
A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:
function calculateBill (items ) {
let total = 0;
total += findSubTotal(items);
total += addTax(total);
total += addTip(total);
return total;
}
Which option allows the developer to step into each function execution within calculateBill?
Answer: D
NEW QUESTION # 44
A developer is setting up a Node.js server and is creating a script at the root of the source code, index.js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.
Which global variable can be used in the script?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
In Node.js:
__filename is the absolute path to the current file (including file name).
__dirname is the absolute path to the directory that contains the current file.
window.location is a browser-only global, not available in Node.js.
this.path is not a standard Node.js global for path information.
The requirement is:
"the folder location that the code executes from."
That is exactly what __dirname provides.
So the correct choice is __dirname.
Concepts: Node.js globals, __filename, __dirname, Node vs browser environment.
________________________________________
NEW QUESTION # 45
......
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