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JS-Dev-101퍼펙트덤프데모문제보기 - JS-Dev-101참고덤프

2026 Fast2test 최신 JS-Dev-101 PDF 버전 시험 문제집과 JS-Dev-101 시험 문제 및 답변 무료 공유: https://drive.google.com/open?id=17_z4aajehuXTBvTXFHwrmPNCyrc9TwRp

Fast2test의Salesforce인증 JS-Dev-101덤프는 인터넷에서 검색되는Salesforce인증 JS-Dev-101시험공부자료중 가장 출중한 시험준비 자료입니다. Salesforce인증 JS-Dev-101덤프를 공부하면 시험패스는 물론이고 IT지식을 더 많이 쌓을수 있어 일거량득입니다.자격증을 취득하여 자신있게 승진하여 연봉협상하세요.

Salesforce JS-Dev-101 시험요강:

주제
소개

주제 1

Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.

주제 2

Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.

주제 3

Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.

주제 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.

주제 5

Variables, Types, and Collections: Covers declaring and initializing variables, working with strings, numbers, dates, arrays, and JSON, along with understanding type coercion and truthy
falsy evaluations.

>> JS-Dev-101퍼펙트 덤프데모문제 보기 <<

시험패스에 유효한 최신버전 JS-Dev-101퍼펙트 덤프데모문제 보기 덤프공부

Fast2test의Salesforce인증 JS-Dev-101시험대비 덤프는 가격이 착한데 비하면 품질이 너무 좋은 시험전 공부자료입니다. 시험문제적중율이 높아 패스율이 100%에 이르고 있습니다.다른 IT자격증에 관심이 있는 분들은 온라인서비스에 문의하여 덤프유무와 적중율등을 확인할수 있습니다. Salesforce인증 JS-Dev-101덤프로 어려운 시험을 정복하여 IT업계 정상에 오릅시다.

최신 Salesforce Developers JS-Dev-101 무료샘플문제 (Q103-Q108):

질문 # 103
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) reader.readAsDataURL(file);
B. 04 const reader = new FileReader();08 if (file) reader.readAsDataURL(file);
C. 04 const reader = new File();08 if (file) URL.createObjectURL(file);
D. 04 const reader = new FileReader();08if (file) URL.createObjectURL(file);

정답：B

질문 # 104
Which option is true about the strict mode in imported modules?

A. Add the statement use non-strict; before any other statements in the module to enable notstrict mode.
B. Imported modules are in strict mode whether you declare them as such or not.
C. Add the statement use strict = false; before any other statements in the module to enable notstrict mode.
D. A developer can only reference notStrict() functions from the imported module.

정답：B

설명：
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
In JavaScript, ES modules (files imported using import / export) have special semantics:
All code inside a module is automatically executed in strict mode.
This is specified by the ECMAScript standard and does not require the explicit "use strict"; directive.
Effects:
You do not need to write "use strict"; at the top of a module file.
You cannot turn strict mode off for module code.
All module top-level code is treated as strict.
Now evaluate each option:
Option A:
Add the statement use non-strict; before any other statements in the module to enable notstrict mode.
There is no use non-strict; directive in JavaScript.
The only directive recognized by engines is "use strict";.
You cannot explicitly enable a "non-strict" mode with such a string.
Option B:
Imported modules are in strict mode whether you declare them as such or not.
This matches the language specification.
ES modules are always in strict mode, automatically.
This is true.
Option C:
Add the statement use strict = false; before any other statements in the module to enable notstrict mode.
use strict = false; is not a directive; it is parsed as a normal expression, and does not affect strict mode.
There is no supported way to disable strict mode in modules.
Option D:
A developer can only reference notStrict() functions from the imported module.
There is no special notStrict() restriction in modules.
Functions exported/imported in modules are simply subject to strict mode rules like the rest of the module's code.
Therefore, the only correct statement is:
Study Guide / Concept Reference (no links):
ES modules (import / export)
Automatic strict mode in modules
"use strict"; directive for scripts vs modules
Inability to disable strict mode in ES module code
________________________________________

질문 # 105
Refer to the code below
let inArray = [[1,2],[3,4,5]];
which two statements results in the array [1,2,3,4,5]?
choose 2 answer

A. [ ].concat.apply([ ],inArray);
B. [ ].concat.apply(inArray,[ ]);
C. [ ].concat([...inArray])
D. [ ].concat(...inArray);

정답：A,D

질문 # 106
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. npm start
B. node start
C. start server.js
D. npm start server.js

정답：A

설명：
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.

질문 # 107
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 server = require('secure-server');
B. const https = require('https');
C. const http = require('http');
D. const tls = require('tls');

정답：B

질문 # 108
......

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JS-Dev-101참고덤프: https://kr.fast2test.com/JS-Dev-101-premium-file.html

그 외, Fast2test JS-Dev-101 시험 문제집 일부가 지금은 무료입니다: https://drive.google.com/open?id=17_z4aajehuXTBvTXFHwrmPNCyrc9TwRp

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