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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q92-Q97):

NEW QUESTION # 92
Refer to the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));

When does Promise.finally on line 08 get called?

A. When resolved and settled
B. When rejected
C. When resolved or rejected
D. WHen resolved

Answer: C

NEW QUESTION # 93
Given the following code:

What will be the first four numbers logged?

A. 0012
B. 0123
C. 0122
D. 0112

Answer: C

NEW QUESTION # 94
Which statement accurately describes an aspect of promises?

A. Arguments for the callback function passed to .then() are optional.
B. In a.then() function, returning results is not necessary since callbacks will catch the result of a previous promise.
C. .then() manipulates and returns the original promise.
D. .then() cannot be added after a catch.

Answer: A

NEW QUESTION # 95
is below:
<input type="file" onchange="previewFile()">
<img src="" height="200" alt="Image Preview..."/>
The JavaScript portion is:
01 function previewFile(){
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 FileReader();
08 if (file) reader.readAsDataURL(file);
B. 04 const reader = new File();
08 if (file) reader.readAsDataURL(file);
C. 04 const reader = new File();
08 if (file) URL.createObjectURL(file);
D. 04 const reader = new FileReader();
08 if (file) URL.createObjectURL(file);

Answer: A

NEW QUESTION # 96
bar, awesome is a popular JavaScript module. the versions publish to npm are:

Teams at Universal Containers use this module in a number of projects. A particular project has thepackage, json definition below.

A developer runs this command: npm install.
Which version of bar .awesome is installed?

A. 1.4.0
B. The command fails, because version 130 is not found
C. 1.3.5
D. 1.3.1

Answer: C

NEW QUESTION # 97
......

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