JS-Dev-101日本語版試験解答、JS-Dev-101独学書籍

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Server Side JavaScript	8%	- Salesforce API integration - Node.js applications - Modules and file operations
Topic 2: Debugging and Error Handling	7%	- Logging strategies and debugging techniques - try-catch blocks
Topic 3: Variables, Types, and Collections	23%	- Type coercion and type conversion - Variable declaration (var, let, const, scoping, hoisting) - Array manipulation (map, filter, reduce, forEach, find) - JSON parsing and stringification - String manipulation and Date objects
Topic 4: Objects, Functions, and Classes	25%	- Object creation, properties, and prototypal inheritance - ES6 Classes, constructors, methods, and inheritance - Higher-order functions and closures - Function declarations, expressions, and arrow functions - JavaScript modules (export, import)
Topic 5: Testing	7%	- Test-driven development principles - Automated testing strategies - Unit testing with Jest
Topic 6: Browser and Events	17%	- Event handling, propagation, bubbling, and capturing - DOM manipulation - Browser Developer Tools
Topic 7: Asynchronous Programming	13%	- Promises and async/await - Callback patterns - Event loop and asynchronous code execution

>> JS-Dev-101日本語版試験解答 <<

Salesforce JS-Dev-101独学書籍 & JS-Dev-101ファンデーション

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Salesforce Certified JavaScript Developer - Multiple Choice 認定 JS-Dev-101 試験問題 (Q115-Q120):

質問 # 115
A developer implements and calls the following code when an application state change occurs:
Const onStateChange =innerPageState) => {
window.history.pushState(newPageState, ' ', null);
}
If the back button is clicked after this method is executed, what can a developer expect?

A. A navigate event is fired with a state property that details the previous application state.
B. The page isnavigated away from and the previous page in the browser's history is loaded.
C. A popstate event is fired with a state property that details the application's last state.
D. The page reloads and all Javascript is reinitialized.

正解：B

質問 # 116
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?

A. console.info(usersList);
B. console.groupCollapsed(usersList);
C. console.group(usersList);
D. console.table(usersList);

正解：D

解説：
Comprehensive and Detailed Explanation From JavaScript Knowledge:
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:
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 # 117
Which two code snippets showworking examples of a recursive function?
Choose 2 answers

A. Let countingDown = function(startNumber) {If ( startNumber >0) {console.log(startNumber) ;return countingDown(startNUmber);} else {return startNumber;}};
B. Const factorial =numVar => {If (numVar < 0) return;If ( numVar === 0 ) return 1;returnnumVar * factorial ( numVar - 1 );};
C. Function factorial ( numVar ) {If (numVar < 0) return;If ( numVar === 0 ) return 1;return numVar -1;
D. Const sumToTen = numVar => {If (numVar < 0)Return;return sumToTen(numVar + 1)};

正解：A、B

質問 # 118
A developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality. The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Which code logs an error at boot time with an event?

A. server.error((error) => {
console.log('ERROR', error);
});
B. server.on('error', (error) => {
console.log('ERROR', error);
});
C. server.catch((error) => {
console.log('ERROR', error);
});
D. try {
server.start();
} catch(error) {
console.log('ERROR', error);
}

正解：B

解説：
Event-driven Node-style APIs expose events via .on(eventName, handler).
To listen for error events:
server.on('error', (error) => {
console.log('ERROR', error);
});
A and B assume methods .error or .catch that don't exist on typical event emitters.
C only catches synchronous errors from server.start(), not async event-based errors.

質問 # 119
01 function changeValue(obj) {
02 obj.value = obj.value / 2;
03 }
04 const objA = { value: 10 };
05 const objB = objA;
06
07 changeValue(objB);
08 const result = objA.value;
What is the value of result?

A. undefined
B. NaN
C. 0
D. 1

正解：C

解説：
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge objA is created with:
{ value: 10 }
objB = objA;
Objects in JavaScript are assigned by reference, not copied.
So objA and objB refer to the same object in memory.
The function:
changeValue(obj) {
obj.value = obj.value / 2;
}
When called as changeValue(objB), it updates the value property of the shared object:
value = 10 / 2 → 5
Therefore:
objA.value === 5
Because objA and objB refer to the same object, the change is reflected in both.
________________________________________
JavaScript Knowledge Reference (text-only)
Objects are stored and passed by reference.
Mutating an object inside a function mutates the original object.

質問 # 120
......

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