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Salesforce JavaScript-Developer-I 認定試験の出題範囲：

トピック	出題範囲
トピック 1	Objects, Functions, and Classes: In this section, the focus is on applying object-oriented principles, functions, and classes. As a Salesforce JavaScript programmer, you will need to locate optimal function implementations and understand how to structure objects and classes for business solutions. You will also be tested on your ability to use JavaScript modules and decorators, while analyzing variable scope and execution flow.
トピック 2	Asynchronous Programming: Asynchronous programming is a key concept in JavaScript, and this section tests your understanding of event loops, asynchronous code execution, and handling promises. Salesforce JavaScript programmer will need to demonstrate their ability to implement asynchronous solutions for business requirements.
トピック 3	Debugging and Error Handling: This section will measure the ability of JavaScript programmer to properly handle errors and debug JavaScript code. You will be expected to apply debugging techniques, such as using the console and breakpoints, to resolve issues. Proper error handling is crucial, and the exam will evaluate your skills in managing and correcting errors efficiently within your code.
トピック 4	Testing: In the topic, you will be required to evaluate unit tests and improve them. The exam will assess your ability to identify ineffective tests and modify them to make them more robust and accurate. This topic ensures that you can write and maintain effective tests, a crucial skill for ensuring code quality and reliability in professional environments.
トピック 5	Variables, Types, and Collections: The topic will test how effectively JavaScript programmers can handle variable creation, initialization, type coercion, and data manipulation. You will need to demonstrate knowledge of strings, numbers, dates, arrays, and JSON handling. The Javascript Developer I exam will require a deep understanding of these concepts and their proper application in real-world scenarios.
トピック 6	Server Side JavaScript: This section focuses on Node.js and server-side JavaScript. Salesforce JavaScript programmers will be tested on their ability to identify appropriate Node.js implementations and commands for given scenarios. Additionally, you will need to recognize which Node.js core modules, libraries, and package management solutions fit specific requirements, reflecting your understanding of server-side development with JavaScript.

参照：https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101

Salesforce Certified JavaScript Developer (JS-Dev-101) 認定 JavaScript-Developer-I 試験問題：

問題 #1
A developer wants to use a module called DatePrettyPrint.
This module exports one default function called printDate().
How can the developer import and use printDate()?

A. import DatePrettyPrint from ' /path/DatePrettyPrint.js ' ;
DatePrettyPrint.printDate();
B. import DatePrettyPrint() from ' /path/DatePrettyPrint.js ' ;
printDate();
C. import printDate from ' /path/DatePrettyPrint.js ' ;
DatePrettyPrint.printDate();
D. import printDate from ' /path/DatePrettyPrint.js ' ;
printDate();

問題 #2
A developer needs the function personalizeWebsiteContent to run when the webpage is fully loaded (HTML and all external resources).
Which implementation should be used?

A. Add a listener to the window object to handle the DOMContentLoaded event
B. Add a handler to the personalizeWebsiteContent script to handle the DOMContentLoaded event
C. Add a listener to the window object to handle the load event
D. Add a handler to the personalizeWebsiteContent script to handle the load event

問題 #3
const str = ' Salesforce ' ;
Which two statements result in the word " Sales " ?

A. str.substring(0, 5);
B. str.substr(s, 5);
C. str.substr(0, 5);
D. str.substring(0, 5);

問題 #4
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?

A. Resolved1 Resolved2 Resolved3 Rejected Resolved4
B. Rejected Resolved4
C. Rejected
D. Resolved1 Resolved2 Resolved3 Resolved4

問題 #5
for (let number = 2; number < = 5; number += 1) {
// faster code statement here
}
Which statement meets the requirements to log an error when the Boolean statement evaluates to false?

A. console.error(number + 2 === 0);
B. console.classy(number + 2 === 0);
C. console.assert(number + 2 === 0);
D. assert(number + 2 === 0);

解説：

問題 #1
正解： D

問題 #2
正解： C

問題 #3
正解： A、C

問題 #4
正解： B

問題 #5
正解： C