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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q82-Q87):

NEW QUESTION # 82
What are two unique features of fat-arrow functions compared to normal function definitions?

A. The function receives an argument called parentThis, giving the enclosing lexical scope.
B. The function uses the this from the enclosing scope.
C. The function generates its own this making it useful for separating scope.
D. If the function has a single expression in the function body, the expression will be evaluated and implicitly returned.

Answer: B,D

Explanation:
Arrow functions have two defining characteristics:
* Implicit return when written as a single expression:
* const fn = () = > 5; // returns 5 automatically
This is unique to arrow functions # A is correct.
* Lexical this binding : Arrow functions do not create their own this. Instead, they use the this value from the surrounding scope # B is correct.
Incorrect options:
* C is false: There is no special argument called parentThis.
* D is the opposite of arrow function behavior: Normal functions create their own this; arrow functions do not.
JavaScript Knowledge References (text-only)
* Arrow functions have lexical this binding.
* Arrow functions support implicit return for single expressions.

NEW QUESTION # 83
Teams at Universal Containers (CU) work on multiple JavaScript projects at the same time. UC us thinking about reusability and how each team can benefit from the work of others.
Going open-source or public is not an option at this time.
Which option is available to UC with npm?

A. Private packages are not supported, but they can use another package manager like yarm.
B. Private packages can be scoped, and scopes can be associated to a private registries.
C. Private register are not supported by npm, but packages can be installed via git.
D. Private registries are not supported by spm, but packages can be installed vis URL.

Answer: A

NEW QUESTION # 84
Which statement accurately describes the behavior of the async/await keywords?

A. The associated class contains some asynchronous functions.
B. The associated function is asynchronous, but acts like synchronous code.
C. The associated function can only be called via asynchronous methods.
D. The associated function sometimes returns a promise.

Answer: B

Explanation:
When async is added to a function:
async function example() {}
JavaScript guarantees:
* The function always returns a Promise , regardless of what is returned inside.
* Inside the function, await pauses execution until a Promise resolves.
* Code appears synchronous even though it uses asynchronous behavior.
Analysis of each option:
* A incorrect: Not " sometimes " -an async function always returns a Promise.
* B incorrect: Async functions can be called just like normal functions.
* C incorrect: Async/await has nothing to do with classes specifically.
* D correct: This is the standard description: "Async functions behave asynchronously but allow writing code that looks synchronous." JavaScript Knowledge References (text-only)
* async functions always return Promises.
* await pauses execution of the async function.
* Async/await syntax creates synchronous-looking code on top of asynchronous operations.

NEW QUESTION # 85
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?

Answer: B

NEW QUESTION # 86
A developer tries to retrieve all cookies, then sets a certain key value pair in the cookie. These statements are used:

What is the behavior?

A. Cookies are read and the key value is set, and all cookies are wiped.
B. A Cookies are read andthe key value is set, the remaining cookies are unaffected.
C. Cookies are read, but the key value is not set because the value is not URL encoded.
D. Cookies are not read because line 01 should be document, cookies, but the key value is set and all cookies are wiped.

Answer: B

NEW QUESTION # 87
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