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Salesforce JavaScript-Developer-I日本語 Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Exam Price: | $200 USD |
| Exam Duration: | 105 minutes |
| Available Languages: | English |
| Passing Score: | 65% |
| Exam Format: | Multiple-select, Multiple-choice |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Certificate Validity Period: | None (Credential does not expire) |
| Related Certifications: | Salesforce Certified JavaScript Developer I Credential |
| Sample Questions: |  |
| Exam Way: | Online (proctored via Pearson VUE) or On-site (at a Pearson VUE testing center) |
| Pre Condition: | None required. 1-2 years of JavaScript development experience (front-end and/or back-end) is strongly recommended. Note: To earn the full credential, candidates must also pass the Lightning Web Components Specialist Superbadge in addition to the JS-Dev-101 exam. |
| Official Syllabus URL: | https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi |
Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Variables, Types, and Collections | 23% | - Truthy and falsy evaluations - Arrays and collections - Strings, numbers, and dates - Type coercion and conversion - JSON parsing and manipulation - Variable declarations and initialization - Primitive and complex data types |
| Topic 2: Server Side JavaScript | 8% | - Package management (npm) - Core Node.js modules - CLI commands - Server-side JavaScript implementations - Node.js fundamentals |
| Topic 3: Objects, Functions, and Classes | 25% | - Function declarations and expressions - Object creation and manipulation - Variable scope and closures - Higher-order functions - Arrow functions - ES6 classes and inheritance - Prototypal inheritance - Execution flow and context - Modules and decorators |
| Topic 4: Asynchronous Programming | 13% | - Promises (creation, chaining, error handling) - Async/Await syntax - Callbacks - Event loop and execution flow - Asynchronous patterns for business requirements |
| Topic 5: Debugging and Error Handling | 7% | - Breakpoints and code inspection - Console methods for debugging - Custom error types - Error handling techniques (try/catch/finally) |
| Topic 6: Testing | 7% | - Test effectiveness evaluation - Writing and modifying unit tests - Unit testing concepts - Test coverage and reliability |
| Topic 7: Browser and Events | 17% | - Event handling and listeners - Browser Developer Tools usage - Event propagation (bubbling and capturing) - Browser-specific APIs - DOM manipulation - Interacting with forms and user input |
Common Questions About the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Exam
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam is the official Salesforce test registered under exam code JavaScript-Developer-I日本語. Passing it earns you the Salesforce Developer certification, a credential at the Junior / Associate level. It is also linked to the related certification: Salesforce Certified JavaScript Developer I Credential. Salesforce exams are valued because they test job-ready skills, so a passing score here carries real weight on a resume.
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam includes 60 (plus up to 5 unscored pilot questions) questions to be completed within 105 minutes. Do the pacing math before exam day: with that many items on the clock, you need a steady rhythm and the discipline to flag a hard question and move on instead of stalling. Two or three full timed sessions with the ActualCollection test engine will show you exactly what that pace feels like, so time pressure stops being a factor on the real day.
To pass the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam you need 65%, and the official registration fee is $200 USD. A retake is not discounted: a failed attempt means paying the full $200 USD again, so treat your first sitting as the expensive one. A sensible rule is to book your seat only after you are scoring comfortably above the passing mark on the ActualCollection practice tests, not just squeaking past it once.
None required. 1-2 years of JavaScript development experience (front-end and/or back-end) is strongly recommended. Note: To earn the full credential, candidates must also pass the Lightning Web Components Specialist Superbadge in addition to the JS-Dev-101 exam.
Eligibility rules do change from time to time, so confirm the current requirements before you register on the official exam page.
Yes. ActualCollection offers a free PDF demo of the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) material so you can judge the question quality and format before spending anything. After purchase, your license includes 365 days of free updates, and if you want to keep receiving updates after that period, renewals are available at a 50% discount.
If you take the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam within 60 days of your purchase and do not pass, ActualCollection backs you with a 100% money-back guarantee. The claim must match the exam your product covers: attempts taken within 3 days of purchase are not eligible (that is too little preparation time), and neither are downloaded-but-unused products, free materials, or expired orders. The candidate name must match the payer name, and you need to submit a scanned enrollment slip plus the official Score Report PDF within 2 days of the exam; claims are processed within 7 days. Prefer not to refund? You can swap instead and receive two other exam products of equal value for free while keeping the update service on your original purchase.
Delivery itself is instant: your files are downloadable right away and emailed to you within one minute of payment. If nothing arrives within 2 hours, contact customer service. There is no limit on how many computers you may install the software on.
The official Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) syllabus is organized into 7 domains. Key areas include Server Side JavaScript (8%), Variables, Types, and Collections (23%), and Browser and Events (17%). The complete, up-to-date topic list appears in the exam topics section above; work through it line by line and flag anything you cannot yet explain in your own words.
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:
修正されたコード:
function Person() {
this.firstName = "ジョン";
}
Person.prototype = {
職種: x => "開発者"
};
const myFather = new Person();
const result = myFather.firstName + " " + myFather.job();
10行目が実行された後、resultの値は何ですか？
- A. "未定義の開発者"
- B. "ジョン・デベロッパー"
- C. エラー: myFather.job は関数ではありません
- D. "ジョン未定義"
Correct Answer: B 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
コードを参照してください。
const pi = 3.1415926;
円周率πのデータ型は何ですか？
- A. フロート
- B. ダブル
- C. 番号
- D. 10進数
Correct Answer: C 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
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 未定義 未定義
- B. 2 2 1 1
- C. 2 2 2 2
- D. 2 2 1 2
Correct Answer: D 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
開発者が、イベントとコールバックを使用して構築されたクライアントライブラリを備えた新しいNode.jsサーバーをセットアップしています。
図書館：
* WebSocket接続を確立し、サーバーへのメッセージの受信を処理します。
* require でインポートされ、ws という変数で使用できるようになります。
* 開発者は、接続が失敗した場合にエラーログを記録する機能も追加したいと考えています。
この情報に基づいて、実行時にリッスンする2つのイベントを持つクライアントを正しく設定する方法を示しているコードセグメントはどれですか？
- A. try {
ws.connect(() = > {
console.log( ' Connected to client ' );
});
} catch(error) {
console.log( ' ERROR ' , error);
} - B. ws.on( ' connect ' , () = > {
console.log( ' Connected to client ' );
});
ws.on( ' error ' , (error) = > {
console.log( ' ERROR ' , error);
}); - C. ws.on( ' connect ' , () = > {
console.log( ' Connected to client ' );
});
ws.on( ' error ' , (error) = > {
console.log( ' ERROR ' , error);
}); - D. ws.connect(() = > {
console.log( ' Connected to client ' );
}).catch((error) = > {
console.log( ' ERROR ' , error);
});
Correct Answer: C 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
以下のHTMLを前提とします。
<div>
<div id="row-uc">ユニバーサルコンテナ</div>
<div id="row-as">適用済み配送</div>
<div id="row-bt">バーリントン・テキスタイルズ</div>
</div>
どのステートメントが、適用済み配送行にpriority-account CSSクラスを追加しますか？
- A. document.querySelector( ' #row-as ' ).classList.add( ' priority-account ' );
- B. document.querySelectorAll( ' #row-as ' ).classList.add( ' priority-account ' );
- C. document.querySelector( ' #row-as ' ).classes.push( ' priority-account ' );
- D. document.getElementById( ' row-as ' ).addClass( ' priority-account ' );
Correct Answer: A 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
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