Vce JavaScript-Developer-I Download & JavaScript-Developer-I Exam Certification

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q104-Q109):

NEW QUESTION # 104
A developer wants to iterate through an array of objects and count the objects and count the objects whose property value, name, starts with the letter N.
Const arrObj = [{"name" : "Zach"} , {"name" : "Kate"},{"name" : "Alise"},{"name" : "Bob"},{"name" :
"Natham"},{"name" : "nathaniel"}
Refer to the code snippet below:
01 arrObj.reduce(( acc, curr) => {
02 //missing line 02
02 //missing line 03
04 ). 0);
Which missing lines 02 and 03 return the correct count?

A. Const sum = curr.startsWIth('N') ? 1: 0;
Return curr+ sum
B. Const sum = curr.name.startsWIth('N') ? 1: 0;
Return curr+ sum
C. Const sum = curr.startsWith('N') ? 1: 0;
Return acc +sum
D. Const sum = curr.name.startsWith('N') ? 1: 0;
Return acc +sum

Answer: D

NEW QUESTION # 105
is below:
<input type="file" onchange="previewFile()">
<img src="" height="200"alt="Image Preview..."/>
The JavaScript portion is:
01 functionpreviewFile(){
02 const preview = document.querySelector('img');
03 const file = document.querySelector('input[type=file]').files[0];
04 //line 4 code
05 reader.addEventListener("load", () => {
06 preview.src = reader.result;
07 },false);
08 //line 8 code
09 }
In lines 04 and 08, which code allows the user to select an image from their local computer , and to display the image in the browser?

A. 04 const reader = new File();08 if (file) URL.createObjectURL(file);
B. 04 const reader = new FileReader();08if (file) URL.createObjectURL(file);
C. 04 const reader = new FileReader();08 if (file) reader.readAsDataURL(file);
D. 04 const reader = new File();08 if (file) reader.readAsDataURL(file);

Answer: C

NEW QUESTION # 106
A developer wants to use a module called DataPrettyPrint. This module exports one default function called printDate ().
How can a developer import and use the printDate() function?
A)

B)

C)

D)

A. Option A
B. Option B
C. Option D
D. Option C

Answer: B

NEW QUESTION # 107
A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?

Answer: C

NEW QUESTION # 108
A developer tries to retrieve all cookies, then sets a certain key value pair in the cookie. These statements are used:

What is the behavior?

A. Cookies are read and the key value is set, and all cookies are wiped.
B. Cookies are read, but the key value is not set because the value is not URL encoded.
C. Cookies are not read because line 01 should be document, cookies, but the key value is set and all cookies are wiped.
D. A Cookies are read and the key value is set, the remaining cookies are unaffected.

Answer: D

NEW QUESTION # 109
......

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