JavaScript-Developer-I Top Dumps, Relevant JavaScript-Developer-I Questions

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Objects, Functions, and Classes	25%	- Object creation and manipulation - Prototypal inheritance - Modules and decorators - Function declarations and expressions - Execution flow and context - Higher-order functions - Arrow functions - ES6 classes and inheritance - Variable scope and closures
Topic 2: Browser and Events	17%	- Interacting with forms and user input - Event handling and listeners - Browser-specific APIs - Event propagation (bubbling and capturing) - Browser Developer Tools usage - DOM manipulation
Topic 3: Testing	7%	- Test effectiveness evaluation - Unit testing concepts - Writing and modifying unit tests - Test coverage and reliability
Topic 4: Debugging and Error Handling	7%	- Console methods for debugging - Error handling techniques (try/catch/finally) - Breakpoints and code inspection - Custom error types
Topic 5: Asynchronous Programming	13%	- Event loop and execution flow - Async/Await syntax - Promises (creation, chaining, error handling) - Asynchronous patterns for business requirements - Callbacks
Topic 6: Server Side JavaScript	8%	- CLI commands - Server-side JavaScript implementations - Node.js fundamentals - Package management (npm) - Core Node.js modules
Topic 7: Variables, Types, and Collections	23%	- Variable declarations and initialization - Arrays and collections - Strings, numbers, and dates - JSON parsing and manipulation - Truthy and falsy evaluations - Primitive and complex data types - Type coercion and conversion

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q93-Q98):

NEW QUESTION # 93
A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named msg is declared and assigned a value on line 03.
function getAvailabilityMessage(item) {
if (getAvailability(item)) {
var msg = " Username available " ;
return msg;
}
}

A. " Username available "
B. undefined
C. " newUserName "
D. " msg is not defined "

Answer: A

Explanation:
The correct answer is C .
When getAvailability(item) returns true, the code inside the if block executes:
var msg = " Username available " ;
return msg;
The variable msg receives the string value:
" Username available "
Then that same value is returned from the function.
The key point is that var is function-scoped, not block-scoped. So msg belongs to the function scope of getAvailabilityMessage(). However, because the return msg; statement is inside the same if block, the function immediately returns the assigned string when the username is available.
Option A is incorrect because msg is defined before it is returned.
Option B is incorrect because " newUserName " is not assigned or returned anywhere in the function.
Option D would only happen if getAvailability(item) returned false, because then the function would finish without an explicit return value.
For the available username scenario, the verified answer is C .

NEW QUESTION # 94
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 # 95
Refer to the HTML below:

Which JavaScript statement results in changing ''Tony'' to ''Mr. T. ''?

A. Document.querySelector (''#main li:nth-child (2) ') , innerHTML = 'Mr . T ';
B. Document.querySelector (' '#main li:second-child') innerHTML, = Mr, T, ';
C. Document.querySelectorAll ( '#main li, Tony ' ) innerHTNL = Mr, T , ' ;
D. Document.querySelectorAll ('#main # TONY ') , innerHTML = Mr, T , ' ;

Answer: D

NEW QUESTION # 96
Given the code block below:

What should a developer insert line 15 to output the following message using the load method?
SNENneziz is loading a cartridge game: super Monic 3x Force...

A. Console16bit = object. Create (GameConsole. Prototype). Load _ function (gamename) (
B. Console16bit. Prototype. Load (gamename) (
C. Console16bit. Prototype. Load = function (gamename) (
D. Console116bit. Prototype. Load (gamename) = function () (

Answer: C

NEW QUESTION # 97
Refer to the code below.

After changing the string index values, the of atr is Javascript''. What is the reason for this value?

A. Non-primitive values are immutable.
B. Primitive values are mutable.
C. Non-primitive values are mutable.
D. Primitive values are immutable

Answer: C

NEW QUESTION # 98
......

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