Exam Name: Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版)
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developer
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Retaking JavaScript-Developer-I日本語 can add unnecessary cost and delay to your certification schedule. Preparing with 149 practice questions from Actual4dump helps you evaluate your readiness for Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) before you commit to another exam date.
Salesforce JavaScript-Developer-I日本語 Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I Exam |
| Exam Number: | JS-Dev-101 / JavaScript-Developer-I |
| Exam Format: | Multiple-select, Multiple-choice |
| Available Languages: | Japanese, English |
| Exam Price: | USD 200 (+ applicable taxes) |
| Passing Score: | 65% |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Related Certifications: | Salesforce Certified Lightning Web Components Specialist Salesforce Certified Platform Developer I |
| Exam Duration: | 105 minutes |
| Certificate Validity Period: | No expiration; requires regular maintenance via Trailhead modules |
| Recommended Training: | Salesforce JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | DOWNLOAD DEMO |
| Exam Way: | Online proctored or onsite at authorized testing centers |
| Pre Condition: | No formal prerequisites; 1–2 years of JavaScript development experience recommended |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascript-developer-i |
Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Debugging and Error Handling | 7% | - Error types and exception handling - Debugging tools and breakpoints - Defensive programming practices - Console methods and logging |
| Asynchronous Programming | 13% | - Async/await syntax - Event loop and micro/macro tasks - Callbacks and callback hell - Fetch API and HTTP requests - Promises and chaining |
| Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Event handling, propagation, and delegation - Browser APIs and Web Storage - Window and document object properties - Script loading and execution order |
| Variables, Types, and Collections | 23% | - Truthy and falsy values - Variable declaration and initialization - Array methods and data manipulation - Working with strings, numbers, dates, and booleans - Type coercion and conversion rules - JSON parsing and usage |
| Testing | 7% | - Unit testing concepts - Code coverage and best practices - Testing frameworks and assertions - Test doubles and mocks |
| Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Object creation, properties, and methods - Decorators and advanced function patterns - Modules and imports/exports - Class syntax, inheritance, and prototypes - Closures and execution context |
| Server-Side JavaScript | 8% | - Module system and require/import - Command-line tools and scripts - Node.js fundamentals and runtime - Core Node.js modules |
Frequently Asked Questions for the Salesforce JavaScript-Developer-I日本語 Exam
The JavaScript-Developer-I日本語 exam, Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版), assesses whether a candidate can apply Salesforce knowledge to the skills measured by this credential. It is associated with the Salesforce Certified JavaScript Developer I certification. The certification is positioned at the Intermediate / Developer level. Related credentials include Salesforce Certified Platform Developer I, Salesforce Certified Lightning Web Components Specialist.
The JavaScript-Developer-I日本語 exam includes 60 scored + up to 5 unscored questions and allows 105 minutes. Plan your pacing before exam day rather than calculating it under pressure. Timed sessions with Actual4dump practice tests can help you decide when to flag a difficult item, keep moving, and reserve enough time for a final review.
The published passing score for Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) is 65%, and the official exam fee is USD 200 (+ applicable taxes). A retake requires budgeting for the full official fee again, so it is sensible to complete several timed practice tests before scheduling. Consistent results across the 149 practice questions can give you a clearer picture of your readiness.
The stated prerequisite information for Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) is: No formal prerequisites; 1–2 years of JavaScript development experience recommended Before registering, review the eligibility details on the official exam page to confirm the requirements.
You can register for Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) through the following channels:
The available exam delivery format is Online proctored or onsite at authorized testing centers.
The following official training resources are recommended for Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版):
After reviewing these training options, you can reinforce each topic with 149 practice questions from Actual4dump.
Yes. Actual4dump provides a free PDF demo so you can review the format and quality of the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) practice questions before placing an order. Your purchase includes 365 days of free updates, and you can extend the update service after expiration at a 50% discount.
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To apply, submit a scanned enrollment slip and the official Score Report PDF within 2 days after the exam. Eligible requests are processed within 7 days. If you prefer an alternative, you may receive two free products of equal value and keep the update service for your original purchase.
Delivery is instant after payment. Your download is also sent to your email within one minute; if it has not arrived within 2 hours, contact customer service. There is no limit on the number of computers on which the material can be installed.
The published Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) outline contains 7 major domains. The opening domains include:
- Variables, Types, and Collections (23%)
- Server-Side JavaScript (8%)
- Testing (7%)
Review the complete Exam Topics section above for every domain and subtopic before planning your study time.
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:
Question 1
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([0]) === 0);
C. console.assert(sum3([-3, 2]) === -1);
D. console.assert(sum3([1, ' 2 ' ]) == 12);
Question 2
以下のコードを参照してください。
class Student {
constructor(name) {
this._name = name;
}
displayGrade() {
console.log(`${this._name} got 70% on test.`);
}
}
class GraduateStudent extends Student {
constructor(name) {
super(name);
this._name = " Graduate Student " + name;
}
displayGrade() {
console.log(`${this._name} got 100% on test.`);
}
}
let student = new GraduateStudent( " Jane " );
学生の成績を表示する
コンソール出力は何ですか？
A. 大学院生のジェーンはテストで100点を獲得しました。
B. 優秀な生徒のジャッキーはテストで70％の点数を取りました。
C. ジャッキーはテストで70％の点数を取りました。
D. キャッチされない参照エラー
Question 3
async/awaitキーワードの動作を正確に説明しているのは、次のうちどれですか？
A. 関連付けられた関数は、非同期メソッドを介してのみ呼び出すことができます。
B. 関連付けられた関数は非同期ですが、同期コードのように動作します。
C. 関連付けられた関数は、プロミスを返すことがあります。
D. 関連付けられたクラスには非同期関数が含まれています。
Question 4
開発者が以下のコードを作成しました。
01 let x = object.value;
02
03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 }
開発者は、handleObjectValue() の後に getNextValue 関数を実行するようにしていますが、エラーが発生した場合は getNextValue() を実行したくないと考えています。開発者は、この動作を確実にするためにコードをどのように変更すればよいでしょうか？
A. 03 try {
04 handleObjectValue(x);
05 getNextValue();
06 } catch(error) {
07 handleError(error);
08 }
B. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 } finally {
08 getNextValue();
09 }
C. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 } then {
08 getNextValue();
09 }
D. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 }
08 getNextValue();
Question 5
以下のコードを参照してください。
01 let o = {
02 get js() {
03 let city1 = String( ' St. Louis ' );
04 let city2 = String( ' New York ' );
05
06 return {
07 firstCity: city1.toLowerCase(),
08 secondCity: city2.toLowerCase(),
09 }
10 }
11 }
開発者は、o.js.secondCityを参照することでどのような価値を期待できるのでしょうか？
A. ' new york '
B. undefined
C. ' New York '
D. An error
Solutions:
| Question 1 Answer: B,C | Question 2 Answer: A | Question 3 Answer: B | Question 4 Answer: A | Question 5 Answer: A |
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