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Salesforce JS-Dev-101 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 2
  • 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 3
  • Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 4
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 5
  • Variables, Types, and Collections: Covers declaring and initializing variables, working with strings, numbers, dates, arrays, and JSON, along with understanding type coercion and truthy
  • falsy evaluations.
Topic 6
  • Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q15-Q20):

NEW QUESTION # 15
Given the following code:
01 let x = null;
02 console.log(typeof x);
What is the output of line 02?

Answer: D

Explanation:
This question focuses on the typeof operator and how JavaScript represents the type of the value null.
Declaration on line 1:
let x = null;
Here:
x is explicitly assigned the value null.
In JavaScript, null is a special primitive value that represents "no value" or "empty value".
Line 2:
console.log(typeof x);
The typeof operator returns a string indicating the type of the operand. For example:
typeof 1 returns "number"
typeof "hello" returns "string"
typeof true returns "boolean"
typeof undefined returns "undefined"
typeof {} returns "object"
typeof [] returns "object" (arrays are objects)
typeof function() {} returns "function"
For null, due to an early design decision in JavaScript, the result is:
typeof null === "object"
This is a known historical quirk of the language:
Although null is a primitive and conceptually means "no object", typeof null returns the string "object".
Therefore, typeof x when x is null evaluates to "object".
So on line 2, the value printed is:
"object"
This matches option A.
The incorrect options are:
B . "undefined": would be typeof x if x were undefined, not null.
C . "x": typeof returns a string describing the type of the value, not the variable name.
D . "null": although intuitive, JavaScript does not return "null" for typeof null; it returns "object" instead.
Therefore, the correct answer is:
Answe r: A
JavaScript knowledge / study guide reference concepts:
typeof operator and its return values
Primitive types in JavaScript (null, undefined, number, string, boolean, symbol, bigint) Historical behavior: typeof null returning "object" Difference between null and undefined in JavaScript


NEW QUESTION # 16
Refer to the code declarations below:
Which three expressions return the string JavaScript?
Choose 3 answers

Answer: B,C,D


NEW QUESTION # 17
Given the expressionsvar1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is string? Choose 2 answers

Answer: B,C


NEW QUESTION # 18
Refer to the followingcode:

Answer: C


NEW QUESTION # 19
Given the code:
const copy = JSON.stringify([new String('false'), new Boolean(false), undefined]); What is the value of copy?

Answer: B

Explanation:
JSON.stringify() applies the following rules:
String objects (new String('false'))
Are converted to their primitive string values.
So:
new String("false") → "false"
Boolean objects (new Boolean(false))
Convert to their primitive boolean value:
new Boolean(false) → false
Undefined values inside arrays
According to the JSON specification, undefined becomes null when stringifying an array:
JSON.stringify([undefined]) → "[null]"
Therefore, the array becomes:
["false", false, null]
And JSON.stringify wraps it in quotes:
'["false", false, null]'
This is exactly option A.
JavaScript Knowledge Reference (text-only)
Object wrappers (String, Boolean) are converted to primitives during JSON serialization.
undefined becomes null inside arrays when stringified.
JSON.stringify() follows the JSON data-model rules strictly.


NEW QUESTION # 20
......

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