JavaScript-Developer-I Practice Questions - JavaScript-Developer-I Latest Study Questions

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Pass Guaranteed Quiz 2026 Updated Salesforce JavaScript-Developer-I: Salesforce Certified JavaScript Developer (JS-Dev-101) Practice Questions

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q26-Q31):

NEW QUESTION # 26
Given the code below:

Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?

A. console.group(usersList) ;
B. console.info(usersList) ;
C. console.table(usersList) ;
D. console.groupCol lapsed (usersList) ;

Answer: A

NEW QUESTION # 27
Refer to the string below:
const str = 'Salesforce';
Which two statements result in the word 'Sales'?
Choose 2 answers

A. str.substring (1, 5);
B. str.substr (0, 5);
C. str.substr(1, 5);
D. str.substring (0, 5);

Answer: B,D

NEW QUESTION # 28
Refer tothe code below:

What is the value of result after line 10 executes?

A. Error: myFather.job is not a function
B. John Developer
C. undefined Developer
D. John undefined

Answer: B

NEW QUESTION # 29
Refer to the following code:
01 let obj = {
02 foo: 1,
03 bar: 2
04 }
05 let output = []
06
07 for (let something of obj) {
08 output.push(something);
09 }
10
11 console.log(output);
What is the value of output on line 11?

A. An error will occur due to the incorrect usage of the for_of statement on line 07.
B. [ " foo " , " bar " ]
C. [ " foo:1 " , " bar:2 " ]
D. [1, 2]

Answer: A

Explanation:
The key line is:
for (let something of obj) {
In JavaScript:
* for...of is used to iterate over iterable objects, such as:
* Arrays
* Strings
* Maps
* Sets
* Other objects that implement a [Symbol.iterator] method.
Plain JavaScript objects created with object literal {} are not iterable by default . They do not have [Symbol.
iterator], so using for...of directly on them causes a runtime error.
Specifically:
for (let something of obj) { ... }
will throw a TypeError similar to:
obj is not iterable
Therefore, the loop body never executes, and console.log(output); is never reached without an error.
Why other options are incorrect:
* B. [1, 2]
* To get [1, 2], you could use Object.values(obj) and iterate that array.
* But here, for...of obj never yields values because it throws an error.
* C. [ " foo " , " bar " ]
* To get property names, you could use Object.keys(obj) with for...of.
* Again, the code does not do that; it incorrectly tries to iterate the object directly.
* D. [ " foo:1 " , " bar:2 " ]
* You would need both keys and values, combining them manually.
* The given code does not implement such logic and fails before pushing anything into output.
Hence, the correct answer is:
The answer: A
Study Guide / Concept References (no links):
* Difference between for...of and for...in
* Iterables in JavaScript and [Symbol.iterator]
* Plain objects {} are not iterable by default
* Correct patterns to iterate object keys/values (Object.keys, Object.values, Object.entries)

NEW QUESTION # 30
Refer to the following 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 exist
Import (foo) from '/path/FooUtils.js';
Import (boo) from ' /path/NarUtils.js';
C. const foo = () => { return 'foo' ; }
const bar = () => { return 'bar' ; }
export { bar, foo }
D. Export default class {
foo() { return 'foo' ; }
bar() { return 'bar' ; }
}

Answer: C,D

NEW QUESTION # 31
......

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