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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Objects, Functions, and Classes	25%	- Decorators and advanced function patterns - Class syntax, inheritance, and prototypes - Modules and imports/exports - Object creation, properties, and methods - Closures and execution context - Function definitions, parameters, and scope
Topic 2: Asynchronous Programming	13%	- Fetch API and HTTP requests - Event loop and micro/macro tasks - Callbacks and callback hell - Async/await syntax - Promises and chaining
Topic 3: Variables, Types, and Collections	23%	- Array methods and data manipulation - Working with strings, numbers, dates, and booleans - JSON parsing and usage - Truthy and falsy values - Variable declaration and initialization - Type coercion and conversion rules
Topic 4: Browsers and Events	17%	- Browser APIs and Web Storage - Window and document object properties - Event handling, propagation, and delegation - Document Object Model (DOM) manipulation - Script loading and execution order
Topic 5: Debugging and Error Handling	7%	- Console methods and logging - Error types and exception handling - Debugging tools and breakpoints - Defensive programming practices
Topic 6: Server-Side JavaScript	8%	- Core Node.js modules - Command-line tools and scripts - Node.js fundamentals and runtime - Module system and require/import
Topic 7: Testing	7%	- Test doubles and mocks - Unit testing concepts - Testing frameworks and assertions - Code coverage and best practices

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q31-Q36):

NEW QUESTION # 31
Refer to thefollowing code that imports a module named utils:
import (foo, bar) from '/path/Utils.js';
foo() ;
bar() ;
Which two implementations of Utils.js export foo and bar such that the code above runs without error?
Choose 2 answers

A. const foo = () => { return 'foo';}const bar = () => {return 'bar'; }Export default foo, bar;
B. // FooUtils.js and BarUtils.js existImport (foo) from '/path/FooUtils.js';Import (boo) from '
/path/NarUtils.js';
C. Export default class {foo() { return 'foo' ; }bar() { return 'bar' ; }}
D. const foo = () => { return 'foo' ; }const bar = () => { return 'bar' ; }export { bar, foo }

Answer: C,D

NEW QUESTION # 32
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 fulfilled or rejected promise will not change states.
C. A pending promise can become fulfilled, settled or rejected.
D. A settled promises can become resolved.

Answer: A,B,D

NEW QUESTION # 33
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 # 34
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.

Which two results occur when running this test on the updated sum3 function?
Choose 2 answers

A. The line 05 assertion passes.
B. The line 02 assertion fails.
C. The line 02 assertion passes.
D. The line 05 assertion fails.

Answer: C,D

NEW QUESTION # 35
Refer to the following code:
function test (val) {
If (val === undefined) {
return 'Undefined values!' ;
}
if (val === null) {
return 'Null value! ';
}
return val;
}
Let x;
test(x);
What is returned by the function call on line 13?

A. Undefined
B. 'Undefined values!'
C. 'Null value!'
D. Line 13 throws an error.

Answer: B

NEW QUESTION # 36
......

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