JavaScript-Developer-I Exams Collection | JavaScript-Developer-I Cost Effective Dumps

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q84-Q89):

NEW QUESTION # 84
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
* Will establish a web socket connection and handle receipt of messages to the server
* Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?

A. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
});
B. ws.connect (( ) => {
console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};
C. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
D. try{
ws.connect (( ) => {
console.log('connected to client'); });

Answer: C

Explanation:
} catch(error) { console.log('ERROR' , error); };
}

NEW QUESTION # 85
Which two console logs output NaN?

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

Answer: A,B

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 # 86
Refer to the code below:
Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];
Which two statements result in the array [1, 2, 3, 4, 5] ?
Choose 2 answers

A. [ ]. Concat.apply ([ ], inArray);
B. [ ]. concat ( [ ....inArray ] );
C. [ ]. concat.apply(inArray, [ ]);
D. [ ]. Concat (... inArray);

Answer: A,D

NEW QUESTION # 87
Refer to the following code block:

What is the console output?

A. > Uncaught Reference Error
B. > Jackie got 70% on test.
C. > Better student Jackie got 70% on test.
D. > Better student Jackie got 100% on test.

Answer: D

NEW QUESTION # 88
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below:

All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.

A. Use the browser to execute a script that removes all the element containing the class ad-library-item.
B. Use the DOM inspector to prevent the load event to be fired.
C. Use the browser console to execute a script that prevents the load event to be fired.
D. Use the DOM inspector to remove all the elements containing the class ad-library-item.

Answer: D

NEW QUESTION # 89
......

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