Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) : JavaScript-Developer-I日本語 Exam

  • Exam Code: JavaScript-Developer-I-JPN
  • Exam Name: Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版)
  • Updated: Oct 24, 2026
  • Q & A: 149 Questions and Answers

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About Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) : JavaScript-Developer-I日本語 Exam Questions

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Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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.
Topic 2
  • 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.
Topic 3
  • 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.
Topic 4
  • 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.
Topic 5
  • 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.
Topic 6
  • Browser and Events: The topic will challenge your ability to work with events, event handlers, and the DOM. You will need to demonstrate how to manage event propagation and utilize browser-specific APIs. Additionally, proficiency in using browser developer tools to investigate code behavior will be tested, making it crucial for you to understand browser interactions thoroughly.

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

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Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:

Question #1

ある開発者が、既存のクライアントからのAPIリクエストを処理する新しいWebサーバーの開発をチーム内で主導している。チームはNode.js上で動作するWebサーバーを希望しており、新しいWebフレームワークであるMinimalist.jsの使用を検討している。しかし、リード開発者は、既にコミュニティが存在する、より実績のあるバックエンドフレームワークの使用を提唱したいと考えている。
リード開発者はどの2つのフレームワークを推奨するだろうか？

  • A. 次へ
  • B. Next.js
  • C. Angular
  • D. ギャツビー
Reveal Solution  Discussion  0

Correct Answer: A,B  🗳️

Explanation: Only visible for VCEEngine members. You can sign-up / login (it's free).

Question #2

テスト対象関数:
01 const sum3 = (arr) = > {
02 if (!arr.length) return 0;
03 if (arr.length === 1) return arr[0];
04 if (arr.length === 2) return arr[0] + arr[1] ;
05 return arr[0] + arr[1] + arr[2];
06 };
この関数に対する有効なテストとなるassert文はどれですか？(2つ選択)

  • A. console.assert(sum3([ ' hello ' , 2, 3, 4]) === NaN);
  • B. console.assert(sum3([-3, 2]) === -1);
  • C. console.assert(sum3([1, ' 2 ' ]) == 12);
  • D. console.assert(sum3([0]) === 0);
Reveal Solution  Discussion  0

Correct Answer: B,D  🗳️

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Question #3

開発者は、エンドポイントの1つで実行時エラーが繰り返し発生するため、Node.jsウェブサーバーのデバッグを行う必要がある。
開発者は、ローカルマシン上でエンドポイントをテストし、ローカルサーバーに対してリクエストを送信して動作を確認したいと考えています。ソースコードでは、server.jsファイルがサーバーを起動します。開発者は、ターミナルのみを使用してNode.jsサーバーのデバッグを行いたいと考えています。
開発者が現在のターミナルウィンドウでCLIデバッガーを開くには、どのコマンドを使用すればよいですか？
(タイプミスを修正済み：node_inspect # ノード検査、node_start_inspect # ノード開始検査)

  • A. node server.js --inspect
  • B. node start inspect server.js
  • C. node inspect server.js
  • D. node -i server.js
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

Question #4

コードを参照してください。
01 const exec = (item, delay) = >
02 new Promise(resolve => setTimeout(() => resolve(item), delay));
03
04 async function runParallel() {
05 const [result1, result2, result3] = await Promise.all(
06 [exec( ' x ' , ' 100 ' ), exec( ' y ' , ' 500 ' ), exec( ' z ' , ' 100 ' )]
07 );
08 return `並列処理が完了しました: ${result1}${result2}${result3}`;
09 }
runParallel() を正しく実行するステートメントはどれですか？(2つ選択)

  • A. runParallel().done(function(data){
    データを返す。
    });
  • B. async runParallel().then(data);
  • C. runParallel().then(function(data){
    データを返す。
    });
  • D. runParallel().then(data);
Reveal Solution  Discussion  0

Correct Answer: C,D  🗳️

Explanation: Only visible for VCEEngine members. You can sign-up / login (it's free).

Question #5

以下のコードを参照してください。
01 function myFunction(reassign) {
02 let x = 1;
03 var y = 1;
04
05 if (reassign) {
06 let x = 2;
07 var y = 2;
08 console.log(x);
09 console.log(y);
10 }
11
12 console.log(x);
13 console.log(y);
14 }
myFunction(true)が呼び出されたとき、何が表示されますか？

  • A. 2 2 2 2
  • B. 2 2 1 2
  • C. 2 2 1 1
  • D. 2 2 未定義 未定義
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

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