JS-Dev-101試験情報、JS-Dev-101試験復習赤本

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Salesforce JS-Dev-101 認定試験の出題範囲：

トピック	出題範囲
トピック 1	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
トピック 2	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.
トピック 3	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.
トピック 4	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
トピック 5	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.

>> JS-Dev-101試験情報 <<

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Salesforce Certified JavaScript Developer - Multiple Choice 認定 JS-Dev-101 試験問題 (Q35-Q40):

質問 # 35
Which two options are core Node.js modules?
Choose 2 answers

A. exception
B. http
C. worker
D. isotream

正解：B、D

質問 # 36
Given the following code:
document.body.addEventListener(' click ', (event) => {
if (/* CODE REPLACEMENT HERE */) {
console.log('button clicked!');
)
});
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?

A. event.target.nodeName == 'BUTTON'
B. Event.clicked
C. e.nodeTarget ==this
D. button.addEventListener('click')

正解：A

質問 # 37
Consider type coercion, what does the following expression evaluate to?
True + 3 + '100' + null

A. 0
B. '4100null'
C. 1
D. '3100null'

正解：B

質問 # 38
A developer removes the HTML class attribute from the checkout button, so now it is simply:
<button>Checkout</button>
There is a test to verify the existence of the checkout button, however it looks for a button with class="blue". The test fails because no such button is found.
Which type of test category describes this test?

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

正解：A

解説：
Definitions in testing context (treating "positive" as "test reports a bug/failure"):
True positive: System has a bug; test correctly fails.
False positive: System is correct; test fails (reports a bug that isn't actually a bug).
True negative: System has a bug; test correctly passes indicating "no success" in detection context (less common phrasing here).
False negative: System has a bug; test incorrectly passes (missed bug).
Here:
The real requirement, as stated, is to verify the existence of the checkout button.
The button still exists (<button>Checkout</button>), so the system behavior is correct regarding that requirement.
The test, however, is checking for an overly specific condition (class="blue"), which is not actually part of the stated requirement.
The test fails, saying there is a problem (no button with class="blue"), even though from the requirement standpoint, the checkout button is present.
So:
No real bug concerning presence of checkout button.
Test reports a failure → a false positive.
Therefore, the correct category is D, False positive.

質問 # 39
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. node start
B. npm start
C. npm start server.js
D. start server.js

正解：B

解説：
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.

質問 # 40
......

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