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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Topic 1: Testing and Debugging	- Unit testing principles - Debugging techniques and tools
Topic 2: Salesforce Platform Integration	- Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript
Topic 3: Browser and DOM Interaction	- Browser APIs (fetch, storage, timers) - DOM manipulation and traversal - Event handling and propagation
Topic 4: JavaScript Language Fundamentals	- Data types, variables, and operators - Functions, scope, and closures - ES6+ syntax and features
Topic 5: Asynchronous JavaScript	- Error handling in async workflows - Event loop and concurrency model - Promises and async/await

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q121-Q126):

NEW QUESTION # 121
Given the code below.

What is logged to the console?

A. 0
B. 1
C. 2
D. 3

Answer: A

NEW QUESTION # 122
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
turn around 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 # 123
Universal Container (UC) notices that its application allows users to search for account makes a network request each time a key is pressed. This results in too many request for the server to handle.
O address this problem, UC decides to implement a deboune function on the search string change handler. Choose 3 answers

A. If the there is an existing setTimeout and the search string changes, cancel the existing setTimeout using the persisted timeout replace it with a new setTimeout.
B. When the search string changes, enqueue the request within a setTimeout.
C. Store the timeId of the setTimeout last enqueued by the search string change handler.
D. Ensure that the network request has the property debounce set to true,
E. If there is an existing settimeout and the search string changes, allow the existing setTimeout to finish, and do not enqueue a settimeout.

Answer: A,B,D

NEW QUESTION # 124
Value of:
true + 3 + ' 100 ' + null

A. " 4100 "
B. " 4100null "
C. " 2200null "
D. 0

Answer: B

Explanation:
The correct answer is A .
JavaScript evaluates the expression from left to right:
true + 3 + ' 100 ' + null
Step 1:
true + 3
In numeric addition, true is converted to:
1
So:
true + 3
becomes:
1 + 3
Result:
4
Step 2:
4 + ' 100 '
Because one operand is a string, JavaScript performs string concatenation instead of numeric addition.
So:
4 + ' 100 '
becomes:
" 4100 "
Step 3:
" 4100 " + null
Again, because one operand is already a string, JavaScript converts null into the string:
" null "
So the final result is:
" 4100null "
Execution summary:
true + 3 + ' 100 ' + null
// 1 + 3 + ' 100 ' + null
// 4 + ' 100 ' + null
// " 4100 " + null
// " 4100null "
Therefore, the verified answer is A .

NEW QUESTION # 125
A developer creates a generic function to log custom messages In the console. To do this, the function below is implemented.

Which three console logging methods allow the use of string substitution in line 02?
Choose 3 answers

A. Info
B. error
C. Message
D. Log
E. Assert

Answer: B,C,E

NEW QUESTION # 126
......

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