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Salesforce JS-Dev-101 Exam Syllabus Topics:

Section	Weight	Objectives
Variables, Types, and Collections	23%	- Strings, numbers, dates, arrays and methods - Data types, type coercion, truthy/falsy values - JSON parsing and manipulation - Variable declaration and scope
Server Side JavaScript	8%	- Node.js fundamentals and core modules - Package management and CLI tools
Debugging and Error Handling	7%	- Console usage, breakpoints and debugging techniques - Error types and handling strategies
Testing	7%	- Test coverage and improvement - Unit test structure and effectiveness
Asynchronous Programming	13%	- Callbacks, promises, async/await - Event loop and execution flow
Objects, Functions, and Classes	25%	- Function types, scope, closures, arrow functions - Object creation, properties, prototypes - ES6 classes, inheritance, modules, decorators
Browser and Events	17%	- DOM selection and manipulation - Browser APIs and developer tools - Event handling, propagation, listeners

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Salesforce Certified JavaScript Developer - Multiple Choice exam questions & JS-Dev-101 torrent pdf & Salesforce Certified JavaScript Developer - Multiple Choice actual dumps

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q125-Q130):

NEW QUESTION # 125
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 (... inArray);
D. [ ]. Concat.apply ([ ], inArray);

Answer: C,D

NEW QUESTION # 126
Refer to the following array:
Let arr = [ 1,2, 3, 4, 5];
Which three options result in x evaluating as [3, 4, 5] ?
Choose 3 answers.

A. Let x= arr.splice(2,3);
B. Let x= arr.slice(2);
C. Let x = arr.slice(2,3);
D. Letx= arr.filter((a) => ( return a>2 ));
E. Let x= arr.filter (( a) => (a<2));

Answer: A,B,D

NEW QUESTION # 127
let sampleText = "The quick brown fox jumps";
Which three expressions return true for a substring?

A. sampleText.indexOf('Quick') !== -1;
B. sampleText.indexOf('fox') !== -1;
C. sampleText.include('fox') !== -1;
D. sampleText.includes('fox');
E. sampleText.indexOf('quick') > -1;

Answer: B,D,E

Explanation:
The correct answers are A, B, and C.
The original variable name appears to contain a typing error. The variable should be used consistently as sampleText:
let sampleText = "The quick brown fox jumps";
A is correct because includes() checks whether a string contains a specific substring and returns a Boolean value:
sampleText.includes('fox');
Since "fox" exists inside "The quick brown fox jumps", this returns:
true
B is correct after correcting the typing error. The correct expression is:
sampleText.indexOf('quick') > -1;
indexOf() returns the index position where the substring is found. If the substring is not found, it returns -1.
Since "quick" exists in the string, sampleText.indexOf('quick') returns a value greater than -1, so the expression returns:
true
C is correct after correcting the missing quotation marks and adding a Boolean comparison:
sampleText.indexOf('fox') !== -1;
The substring "fox" exists in the string, so indexOf('fox') does not return -1. Therefore, the expression returns:
true
D is incorrect because the method name is typed incorrectly. JavaScript string has includes(), not include().
Incorrect:
sampleText.include('fox')
Correct:
sampleText.includes('fox')
E is incorrect because JavaScript string matching is case-sensitive:
sampleText.indexOf('Quick') !== -1;
The string contains "quick" with a lowercase q, not "Quick" with an uppercase Q, so this returns:
false
Therefore, the verified answers are A, B, and C.

NEW QUESTION # 128
A developer initiates a server with the file server.js and adds dependencies in the source code's package.json that are required to run the server.
Which command should the developer run to start the server locally?

A. node start
B. npm start server.js
C. start server.js
D. npm start

Answer: D

Explanation:
Comprehensive and Detailed Explanation From JavaScript/Node.js Knowledge:
In a Node.js project that uses package.json, you typically define a "start" script:
{
"scripts": {
"start": "node server.js"
}
}
Then you start the app with:
npm start
npm start:
Looks up the "start" script in package.json.
Runs the command defined there (commonly node server.js).
This is the standard way to start a Node.js app with npm-managed dependencies.
Why others are incorrect:
A . node start
Tries to run a file named start with Node; does not use package.json scripts.
C . npm start server.js
npm start does not take the script filename as an argument in this way; it just runs the start script as defined.
D . start server.js
Not an npm or node command; on some shells it just tries to "start" a process but is not the standard Node/npm workflow.
Relevant concepts: package.json, npm scripts, npm start, Node entry file execution.
________________________________________

NEW QUESTION # 129
A developer is setting up a Node,js server and is creating a script at the root of the source code, index,js, that will start the server when executed. The developer declares a variable that needsthe folder location that the code executes from.
Which global variable can be used in the script?

A. _filename
B. _dirname
C. window.location
D. this.path

Answer: A

NEW QUESTION # 130
......

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