JavaScript-Developer-I Certified - JavaScript-Developer-I Latest Exam Experience

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q146-Q151):

NEW QUESTION # 146
Refer to the code below:

Which statement allows a developer to cancel the scheduled timed function?

A. ClearTimeout (timerId) ;
B. removeTimeout (timeFunction) ;
C. removeTimeout (timerId) ;
D. ClearTimeout (timeFunction);

Answer: B

NEW QUESTION # 147
Which three browser specific APIs are available for developers to persist data between page loads?

A. global variables
B. IIFEs
C. localStorage
D. cookies
E. indexedDB

Answer: C,D,E

Explanation:
We want mechanisms that persist data between page loads (i.e., after refresh or navigation), in the browser.
* A. localStorage
* Part of the Web Storage API.
* Data persists across page reloads and browser restarts (until explicitly cleared).
* Scoped per origin (protocol + host + port).
* This is a correct persistent storage API.
* B. indexedDB
* A low-level, client-side NoSQL database in the browser.
* Stores large amounts of structured data and persists across reloads and sessions.
* This is also a correct persistent API.
* C. cookies
* Small key/value pairs stored by the browser and often sent with HTTP requests.
* Can have expiration dates and persist across page loads and sessions.
* They are a traditional persistence mechanism in browsers.
* So cookies also qualify.
* D. global variables
* Global JS variables exist only for the life of the current page context.
* When the page is refreshed or navigated away, they are lost.
* They do not persist between page loads.
* E. IIFEs (Immediately Invoked Function Expressions)
* A pattern for creating a new scope, not a persistence mechanism.
* Variables inside an IIFE are still lost when the page reloads.
Thus, the three persistent browser APIs are:
* localStorage
* indexedDB
* cookies

NEW QUESTION # 148
A developer wants to create an object from a function in the browser using the code
below:
Function Monster() { this.name = 'hello' };
Const z = Monster();
What happens due to lack of the new keyword on line 02?

A. Window.name is assigned to 'hello' and the variable z remains undefined.
B. Window.m is assigned the correct object.
C. The z variable is assigned the correct object but this.name remains undefined.
D. The z variable is assigned the correct object.

Answer: A

NEW QUESTION # 149
A developer wants to create an object from a function in the browser using the code below.

What happens due to the lack of the mm keyword on line 02?

A. The m variable is assigned the correct object but this.name remains undefined.
B. window.m Is assigned the correct object.
C. The m variable is assigned the correct object.
D. window.name is assigned to 'hello' and the variable = remains undefined.

Answer: D

NEW QUESTION # 150
A developer has a web server running with Node.js. The command to start the web server is node server.js. The web server started having latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?

A. NODE_DEBUG=http,https node server.js
B. DEBUG=true node server.js
C. DEBUG=http, https node server.js
D. NODE_DEBUG=true node server.js

Answer: B

NEW QUESTION # 151
......

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