Exam JS-Dev-101 Sample, JS-Dev-101 Latest Test Format

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Salesforce JS-Dev-101 Exam Syllabus Topics:

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

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Quiz 2026 Accurate Salesforce Exam JS-Dev-101 Sample

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q25-Q30):

NEW QUESTION # 25
Corrected code:
let obj = {
foo: 1,
bar: 2
};
let output = [];
for (let something in obj) {
output.push(something);
}
console.log(output);
What is the output of line 11?

Answer: D

Explanation:
The verified answer is C.
This object has two properties:
let obj = {
foo: 1,
bar: 2
};
The property names are:
foo
bar
The property values are:
1
2
The loop used here is a for...in loop:
for (let something in obj) {
output.push(something);
}
A for...in loop iterates over the property keys of an object, not the property values.
So during the first iteration:
something === "foo"
The code pushes "foo" into the array.
During the second iteration:
something === "bar"
The code pushes "bar" into the array.
The final value of output is:
["foo", "bar"]
That is why:
console.log(output);
prints:
["foo", "bar"]
Option B would be correct only if the code pushed the values, for example:
output.push(obj[something]);
Option D would require building formatted strings manually, such as:
output.push(`${something}:${obj[something]}`);
But the given code only pushes the property names.
Therefore, the verified answer is C.


NEW QUESTION # 26
Refer to the code below:

Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?

Answer: B


NEW QUESTION # 27
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

Answer: B,C,D


NEW QUESTION # 28
Which two console logs output NaN?

Answer: B,D

Explanation:
Comprehensive and Detailed Explanation From JavaScript Knowledge:
Recall:
NaN stands for "Not-a-Number".
Arithmetic involving non-numeric values that cannot be converted to numbers often results in NaN.
Check each:
A . 10 / 0
In JavaScript, dividing a positive number by 0 results in Infinity, not NaN.
So this logs Infinity.
B . parseInt('two')
parseInt tries to parse a numeric prefix from the string.
'two' does not start with numeric digits, so parseInt('two') returns NaN.
The console log prints NaN.
C . 10 / Number('5')
Number('5') → 5.
10 / 5 → 2.
Logs 2, not NaN.
D . 10 / 'five'
'five' is coerced to a number using Number('five'), which is NaN.
10 / NaN → NaN.
Logs NaN.
So the console logs that output NaN are from B and D.
Relevant concepts: NaN, Infinity, parseInt, Number() coercion, arithmetic with invalid numeric values.
________________________________________


NEW QUESTION # 29
Given the following code:
Let x =null;
console.log(typeof x);
What is the output of the line 02?

Answer: D


NEW QUESTION # 30
......

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