JS-Dev-101試験の準備方法｜ユニークなJS-Dev-101合格率書籍試験｜最新のSalesforce Certified JavaScript Developer - Multiple Choice学習資料

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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
  • Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
トピック 2
  • 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 3
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
トピック 4
  • 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-101合格率書籍 <<

JS-Dev-101学習資料、JS-Dev-101試験問題集

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Salesforce Certified JavaScript Developer - Multiple Choice 認定 JS-Dev-101 試験問題 (Q135-Q140):

質問 # 135
developer is trying to convince management that their team will benefit from using Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the teamhas already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Choose 3 answers:

正解：A、C、D


質問 # 136
Refer to the code:
01 function execute() {
02 return new Promise((resolve, reject) => reject());
03 }
04 let promise = execute();
05
06 promise
07 .then(() => console.log('Resolved1'))
08 .then(() => console.log('Resolved2'))
09 .then(() => console.log('Resolved3'))
10 .catch(() => console.log('Rejected'))
11 .then(() => console.log('Resolved4'));
What is the result when the Promise in the execute function is rejected?

正解：D

解説：
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
execute() returns a Promise that immediately calls reject().
So promise starts in a rejected state.
When a Promise is rejected and you chain .then() calls without rejection handlers, all those .then() callbacks are skipped until a .catch() is encountered:
promise
.then(...) // skipped
.then(...) // skipped
.then(...) // skipped
.catch(...) // executed
.then(...); // executed after catch
Execution:
.then(() => console.log('Resolved1')) is skipped.
.then(() => console.log('Resolved2')) is skipped.
.then(() => console.log('Resolved3')) is skipped.
.catch(() => console.log('Rejected')) runs and logs Rejected.
The .catch() returns a resolved Promise (no explicit return, so undefined), so the next .then() runs:
.then(() => console.log('Resolved4')) logs Resolved4.
Final output:
Rejected
Resolved4
This matches option D.
________________________________________


質問 # 137
After user acceptance testing, the developer is asked to change the webpage background based on the user's location. It works on the developer's computer but not on the tester's machine.
Which two actions will help determine accurate results?

正解：A、D

解説：
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Browsers often cache JavaScript, CSS, and HTML. This means:
The developer may be running with the latest version (often with cache disabled in DevTools).
The tester may still be loading an older, cached version of the page where the background-change logic does not exist.
To ensure they are actually testing the latest deployed code:
Disabling cache (A) in the tester's browser (usually via DevTools → Network → "Disable cache") forces fresh loading of all resources on each refresh.
Clearing cache (C) removes older resources from the browser so the next load fetches fresh files from the server.
Options B and D do not directly help verify the tester is using the latest code:
B checks the developer's own browser, which is not the environment showing the problem.
D suggests reworking the code before confirming whether the tester is actually loading the correct version, which is premature.
So the two actions that help produce accurate testing results are A and C.
________________________________________


質問 # 138
Given two expressions, `exp1` and `exp2`, which two valid ways to return the logical AND of the two expressions and ensure it is a boolean?

正解：A、C


質問 # 139
Given the code below:
01 function Person(name, email) {
02 this.name = name;
03 this.email = email;
04 }
05
06 const john = new Person('John', 'john@email.com');
07 const jane = new Person('Jane', 'jane@email.com');
08 const emily = new Person('Emily', 'emily@email.com');
09
10 let usersList = [john, jane, emily];
Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?

正解：A

解説：
We have an array of plain objects:
[
{ name: 'John', email: 'john@email.com' },
{ name: 'Jane', email: 'jane@email.com' },
{ name: 'Emily', email: 'emily@email.com' }
]
We want:
A "visual representation" of the list.
Ability to sort by name or email in DevTools.
console.table:
console.table(data) renders data as a table in most browser devtools and Node consoles that support it.
Each object becomes a row; properties (name, email) become columns.
Many DevTools UIs allow:
Clicking column headers to sort by that column.
Filtering / viewing in a structured way.
So:
console.table(usersList);
Displays a sortable table of users by name or email. This matches the requirement exactly.
Other options:
console.group(usersList);
Starts a console group. The argument is just logged as a line label.
It does not create a table or sortable view; it just groups subsequent logs.
console.groupCollapsed(usersList);
Same grouping behavior, but collapsed by default.
Again, no table or sortable columns.
console.info(usersList);
Logs the array in the console, but as a standard log/info.
You can expand objects, but there is no table view or built-in column sorting.
Therefore, the correct method is:
Answe r: A
Study Guide / Concept Reference (no links):
console.table for tabular logging
console.group and console.groupCollapsed for grouped logs
console.log / console.info standard logging behavior
DevTools UI support for sorting columns in console.table


質問 # 140
......

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