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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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2026 JavaScript-Developer-I Exam Questions Pdf | Pass-Sure JavaScript-Developer-I Reliable Exam Sample: Salesforce Certified JavaScript Developer (JS-Dev-101)

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q135-Q140):

NEW QUESTION # 135
Which code statement below correctly persists an objects in local Storage ?

A. const setLocalStorage = ( jsObject) => {
window.localStorage.connectObject(jsObject));
}
B. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.setItem(storageKey, JSON.stringify(jsObject));
}
C. const setLocalStorage = ( jsObject) => {
window.localStorage.setItem(jsObject);
}
D. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.persist(storageKey, jsObject);
}

Answer: B

Explanation:

NEW QUESTION # 136
A developer uses a parsed JSON string to work with user information as in the block below:

Which two option access the email attributes in the object? Choose 2 answers

A. userInformation. Get (''email'')
B. userInformation. email
C. userInformation(email)
D. userInformation ( ''email'' )

Answer: B,D

NEW QUESTION # 137
Universal Container(UC) just launched a new landing page, but users complain that the
website is slow. A developer found some functions that cause this problem. To verify this, the
developer decides to do everything and log the time each of these three suspicious functions
consumes.
console.time('Performance');
maybeAHeavyFunction();
thisCouldTakeTooLong();
orMaybeThisOne();
console.endTime('Performance');
Which function can the developer use to obtain the time spent by every one of the three
functions?

A. console.timeLog()
B. console.timeStamp()
C. console.trace()
D. console.getTime()

Answer: A

NEW QUESTION # 138
Universal Containers (UC) just launched anew landing page, but users complain that the website is slow. A developer found some functions any that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
Which function can the developer use to obtain the time spent by every one of the three functions?

A. console.timeStamp ()
B. console. timeLog ()
C. console.getTime ()
D. console.trace()

Answer: B

NEW QUESTION # 139
Which two console logs output NaN?

A. console.log(parseInt( ' two ' ));
B. console.log(10 / Number( ' 5 ' ));
C. console.log(10 / 0);
D. console.log(10 / ' five ' );

Answer: A,D

Explanation:
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 # 140
......

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