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Salesforce JS-Dev-101 Prüfungsplan:

Thema	Einzelheiten
Thema 1	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Thema 2	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Thema 3	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Thema 4	Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.

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JS-Dev-101 Salesforce Certified JavaScript Developer - Multiple Choice Pass4sure Zertifizierung & Salesforce Certified JavaScript Developer - Multiple Choice zuverlässige Prüfung Übung

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Salesforce Certified JavaScript Developer - Multiple Choice JS-Dev-101 Prüfungsfragen mit Lösungen (Q143-Q148):

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

Antwort: A

144. Frage
Refer to the code below:
01 const addBy = ?
02 const addByEight = addBy(8);
03 const sum = addByEight(50);
Which two functions can replace line 01 and return 58 to sum?

A. (Corrected for typing errors)
const addBy = (num1) => {
return function(num2) {
return num1 + num2;
}
B. const addBy = function(num1) {
return function(num2) {
return num1 + num2;
}
}
C. const addBy = (num1) => num1 + num2;
D. const addBy = function(num1) {
return num1 * num2;
}

Antwort: A,B

Begründung:
}
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
We want:
const addByEight = addBy(8);
const sum = addByEight(50);
And we need sum to be 58.
That means:
addBy(8) must return a function.
That returned function, when called with 50, must compute 8 + 50.
So addBy must be a higher-order function that returns another function capturing num1 and later using it with num2 (a closure).
Option A
const addBy = function(num1) {
return function(num2) {
return num1 + num2;
}
}
Step-by-step:
Call addBy(8):
num1 is 8.
The function returns an inner function: function(num2) { return num1 + num2; }.
So addByEight becomes this inner function, with num1 closed over as 8.
Then call addByEight(50):
num2 is 50.
The body computes num1 + num2, i.e., 8 + 50 = 58.
Therefore, with Option A in place:
const addByEight = addBy(8); // returns inner function
const sum = addByEight(50); // 58
So sum is 58. Option A is correct.
Option D (corrected)
const addBy = (num1) => {
return function(num2) {
return num1 + num2;
}
}
This is essentially the same logic expressed with an arrow function for the outer function:
Call addBy(8):
num1 is 8.
Returns the inner function function(num2) { return num1 + num2; }.
Call addByEight(50):
num2 is 50.
Computes num1 + num2 → 8 + 50 = 58.
So again:
const addByEight = addBy(8); // inner function with num1 = 8
const sum = addByEight(50); // 58
Option D is also correct.
Thus, A and D are the two functions that satisfy the requirement.
Why B and C are incorrect
Option B:
const addBy = function(num1) {
return num1 * num2;
}
This does not return a function; it returns a value.
addBy(8) returns 8 * num2, but num2 is not defined in this scope, which would cause a ReferenceError.
Also, addByEight would be a number (if num2 existed), not a function, so addByEight(50) would fail.
Option C:
const addBy = (num1) => num1 + num2;
Again, addBy returns a value, not a function.
addBy(8) returns 8 + num2, but num2 is not defined, so this is also invalid due to ReferenceError.
addByEight would be a number (or error), not a function.
Neither B nor C creates the required closure nor returns a function to be called later.
Reference / Study Guide concepts (no links):
Higher-order functions in JavaScript
Closures: inner functions capturing outer variables (num1)
Arrow functions vs function expressions
Returning functions from functions (function factories / currying)
Scope and ReferenceError when a variable is not defined
________________________________________

145. Frage
A developer wants to set up a secure web server with Node.js. The developer creates a directory locally called app-server, and the first file is app-server/index.js.
Without using any third-party libraries, what should the developer add to index.js to create the secure web server?

A. const http = require('http');
B. const server = require('secure-server');
C. const https = require('https');
D. const tls = require('tls');

Antwort: C

Begründung:
Node.js provides two built-in modules for creating servers:
http → creates non-secure HTTP servers
https → creates secure HTTPS servers
A secure server requires:
SSL/TLS certificates (key and cert)
The built-in Node.js module designed to handle these: https
Syntax for a secure server:
const https = require('https');
const fs = require('fs');
const options = {
key: fs.readFileSync('key.pem'),
cert: fs.readFileSync('cert.pem')
};
https.createServer(options, (req, res) => {
res.write('Secure Server');
res.end();
}).listen(443);
Evaluation of options:
A is incorrect: No built-in module named secure-server exists.
B is incorrect: tls provides low-level TLS sockets, not HTTP/HTTPS servers.
C is incorrect: http only creates an insecure server.
D is correct: https is the built-in module required for secure web servers.
JavaScript Knowledge Reference (text-only)
Node.js exposes built-in modules http and https for server creation.
Secure servers require the https module, which supports TLS/SSL.
The tls module is lower-level and not used for full HTTP servers.

146. Frage
Given the code below:
let numValue = 1982;
Which three code segments result in a correct conversion from number to string?

A. let strValue = numValue.toText();
B. let strValue = (String)numValue;
C. let strValue = String(numValue);
D. let strValue = numValue.toString();
E. let strValue = '' + numValue;

Antwort: C,D,E

Begründung:
This is not valid JavaScript casting syntax; it is more like a C/Java-style cast.
In JavaScript, that is parsed as a grouping expression (String) and then numValue; it does not convert numValue to a string.
Thus the correct answers are:
B . String(numValue);
C . '' + numValue;
D . numValue.toString();
Relevant concepts: primitive type conversion, String() casting, .toString(), coercion via + with strings.
Explanation:
We want to convert the number 1982 to a string.
Check each option:
A . numValue.toText()
There is no standard toText() method on numbers.
This will result in TypeError: numValue.toText is not a function.
B . String(numValue);
String() as a function converts its argument to a string.
String(1982) returns "1982".
This is correct.
C . '' + numValue;
'' is a string; + with a string operand performs string concatenation.
'' + 1982 → "1982".
This is a common shorthand for number-to-string conversion.
D . numValue.toString();
Number.prototype.toString() converts the number to its string representation.
1982..toString() or (1982).toString() returns "1982".
For the variable, numValue.toString() is valid: "1982".

147. Frage
A test searches for:
<button class="blue">Checkout</button>
But the actual HTML is:
<button>Checkout</button>
The test fails because it expects a class that no longer exists.
What type of test outcome is this?

A. True positive
B. False negative
C. False positive
D. True negative

Antwort: B

Begründung:
Definitions:
False negative → The test reports a failure even though the feature actually works.
False positive → The test reports success when it should not.
True positive → Correctly identifies something is working.
True negative → Correctly identifies something is not working.
In this scenario:
The checkout button does exist, so the feature works.
The test fails incorrectly, because it is checking for the wrong selector.
That is the definition of a false negative.
JavaScript Knowledge Reference (text-only)
Test outcome classification: false negative = feature works but test fails.

148. Frage
......

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