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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Testing	7%	- Unit testing concepts - Test coverage and reliability - Writing and modifying unit tests - Test effectiveness evaluation
Topic 2: Browser and Events	17%	- Interacting with forms and user input - Event propagation (bubbling and capturing) - Event handling and listeners - DOM manipulation - Browser-specific APIs - Browser Developer Tools usage
Topic 3: Objects, Functions, and Classes	25%	- Function declarations and expressions - ES6 classes and inheritance - Variable scope and closures - Object creation and manipulation - Modules and decorators - Arrow functions - Execution flow and context - Higher-order functions - Prototypal inheritance
Topic 4: Asynchronous Programming	13%	- Async/Await syntax - Event loop and execution flow - Callbacks - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling)
Topic 5: Variables, Types, and Collections	23%	- JSON parsing and manipulation - Primitive and complex data types - Variable declarations and initialization - Strings, numbers, and dates - Type coercion and conversion - Truthy and falsy evaluations - Arrays and collections
Topic 6: Debugging and Error Handling	7%	- Breakpoints and code inspection - Console methods for debugging - Error handling techniques (try/catch/finally) - Custom error types
Topic 7: Server Side JavaScript	8%	- Server-side JavaScript implementations - Core Node.js modules - CLI commands - Package management (npm) - Node.js fundamentals

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q131-Q136):

NEW QUESTION # 131
Which three statements are true about promises?
The executor of a new promise runs automatically.

A. A promise has a . then 90 method.
B. A pending promise can become fulfilled, settled or rejected.
C. A settled promises can become resolved.
D. A fulfilled or rejected promise will not change states.

Answer: A,C,D

NEW QUESTION # 132
Given the HTML below:

Which statement adds the priority-account css class to the Applied Shipping row?

Answer:

Explanation:
document.querySelector('#row-as').classList.add('priority-account');

NEW QUESTION # 133
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint 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:

A. A variable displaying the number of instances created for the Car Object.
B. The style, event listeners and other attributes applied to the carSpeed DOM element
C. The information stored in the window.localStorage property
D. The values of the carSpeed and fourWheels variables

Answer: B,C

NEW QUESTION # 134
Refer the code below.
x=3.14;
function myfunction() {
"use strict";
y=x;
}
z=x;
myFunction();

Answer:

Explanation:
Z is equal to 3.14
Use strict has effect only on line 5.
Line 5 throws an error

NEW QUESTION # 135
Given the following code:
01 let x = null;
02 console.log(typeof x);
What is the output of line 02?

A. " object "
B. " undefined "
C. " null "
D. " x "

Answer: A

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:
The answer: 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 # 136
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