Salesforce JS-Dev-101 Exam Cram Pdf & Sample JS-Dev-101 Questions

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The Salesforce JS-Dev-101 certification exam is one of the valuable credentials designed to demonstrate a candidate's technical expertise in information technology. They can remain current and competitive in the highly competitive market with the JS-Dev-101 certificate. For novices as well as seasoned professionals, the Salesforce Certified JavaScript Developer - Multiple Choice Questions provide an excellent opportunity to not only validate their skills but also advance their careers.

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Sample JS-Dev-101 Questions & Real JS-Dev-101 Exam Questions

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Salesforce JS-Dev-101 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 2
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 3
  • Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
Topic 4
  • Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 5
  • Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q74-Q79):

NEW QUESTION # 74
Considering type coercion, what does the following expression evaluate to?
true + '13' + NaN

Answer: A

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Expression:
true + '13' + NaN
The + operator is left-associative, so evaluation order:
true + '13'
When one operand is a string, + performs string concatenation.
true is converted to string 'true'.
'true' + '13' → 'true13'.
Result from step 1 with NaN:
'true13' + NaN
Again, one operand is a string, so concatenation.
NaN is converted to string 'NaN'.
'true13' + 'NaN' → 'true13NaN'.
Final value: 'true13NaN'.
So A is correct.
Why others are wrong:
B: '113NaN' would require true to coerce to 1 first and no string to be present, which is not the case because '13' forces string concatenation.
C: 14 would require pure numeric addition, which is not the case once a string is involved.
D: 'true13' ignores the final + NaN part.
Concepts: type coercion with +, boolean to string, NaN to string, left-associative evaluation.
________________________________________


NEW QUESTION # 75
Given the code below:
01 const delay = async delay => {
02 return new Promise((resolve, reject) => {
03 console.log(1);
04 setTimeout(resolve, delay);
05 });
06 };
07
08 const callDelay = async () => {
09 console.log(2);
10 const yup = await delay(1000);
11 console.log(3);
12 };
13
14 console.log(4);
15 callDelay();
16 console.log(5);
What is logged to the console?

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Execution order:
Top-level code runs synchronously:
Line 14: console.log(4); → logs 4.
Line 15: callDelay(); is called.
Inside callDelay:
Line 9: console.log(2); → logs 2.
Line 10: await delay(1000);:
Calls delay(1000).
Inside delay(1000):
Line 3: console.log(1); → logs 1.
Line 4: setTimeout(resolve, delay); schedules resolve in 1000 ms.
delay returns a pending Promise. await pauses callDelay here and returns control to the event loop.
Back to top-level:
Line 16: console.log(5); → logs 5.
So synchronous log sequence is: 4, 2, 1, 5.
After ~1000 ms:
The setTimeout in delay resolves the Promise.
The await in callDelay resumes.
Line 11: console.log(3); → logs 3.
Final log order: 4 2 1 5 3.
Both A and B show the same sequence; one must be chosen, so A is correct.
Concepts: async/await flow, Promise resolution timing, event loop, and ordering of synchronous vs timer callbacks.
________________________________________


NEW QUESTION # 76
A developer has the function, shown below, that is called when a page loads.
function onload() {
console.log("Page has loaded!");
}
Where can the developer see the log statement after loading the page in the browser?

Answer: D


NEW QUESTION # 77
A developer is asked to fix some bugs reported by users. To do that, the developer adds abreakpoint for debugging.
Function Car (maxSpeed, color){
This.maxspeed =masSpeed;
This.color = color;
Let carSpeed = document.getElementById(' CarSpeed');
Debugger;
Let fourWheels =new Car (carSpeed.value, 'red');
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console ?
Choose 2 answers:

Answer: A,D


NEW QUESTION # 78
Refer to the code below:
<html lang="en">
<table onclick="console.log(Table log');">
<tr id="row1">
<td>Click me!</td>
</tr>
<table>
<script>
functionprintMessage(event) {
console.log('Row log');
}
Let elem = document.getElementById('row1');
elem.addEventListener('click', printMessage, false);
</script>
</html>
Which code change should be made for the console to log only Row log when 'Click me! ' is clicked?

Answer: C


NEW QUESTION # 79
......

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