Salesforce JavaScript-Developer-I日本語 : Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版)
Exam Code: JavaScript-Developer-I-JPN
Exam Name: Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版)
Updated: Oct 27, 2026
Q & A: 149 Questions and Answers
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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 |
| Passing Score: | 65% |
| Related Certifications: | Salesforce Certified JavaScript Developer I Credential |
| Exam Price: | $200 USD |
| Exam Duration: | 105 minutes |
| 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) |
| Available Languages: | English |
| 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 |
|---|---|---|
| Variables, Types, and Collections | 23% | - JSON parsing and manipulation - Type coercion and conversion - Arrays and collections - Variable declarations and initialization - Strings, numbers, and dates - Primitive and complex data types - Truthy and falsy evaluations |
| Browser and Events | 17% | - Browser-specific APIs - Event handling and listeners - DOM manipulation - Interacting with forms and user input - Event propagation (bubbling and capturing) - Browser Developer Tools usage |
| Server Side JavaScript | 8% | - CLI commands - Node.js fundamentals - Server-side JavaScript implementations - Core Node.js modules - Package management (npm) |
| Testing | 7% | - Test effectiveness evaluation - Test coverage and reliability - Unit testing concepts - Writing and modifying unit tests |
| Debugging and Error Handling | 7% | - Error handling techniques (try/catch/finally) - Breakpoints and code inspection - Custom error types - Console methods for debugging |
| Objects, Functions, and Classes | 25% | - Modules and decorators - Variable scope and closures - Function declarations and expressions - ES6 classes and inheritance - Execution flow and context - Arrow functions - Object creation and manipulation - Higher-order functions - Prototypal inheritance |
| Asynchronous Programming | 13% | - Promises (creation, chaining, error handling) - Callbacks - Event loop and execution flow - Asynchronous patterns for business requirements - Async/Await syntax |
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Exam: Decide With Evidence
Salesforce recommends these training resources for the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam:
Follow the training with steady self-testing — the 149 practice questions from FreePdfDump help you apply theory and fill any gaps the training leaves.
The JavaScript-Developer-I日本語 exam is a Salesforce certification exam validating the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) syllabus shown above. It belongs to these credential paths: Salesforce Certified JavaScript Developer I Credential. Candidates in 2026 start with FreePdfDump's 149 practice questions, available as a printable PDF, a Windows Desktop Test Engine, and an Online Test Engine — three versions of the same materials.
FreePdfDump issues a full refund if you take the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam within 60 days of purchase and do not pass. The policy does not apply if the exam is taken within 3 days of purchase, if the exam was never actually taken, or to free materials or expired orders, and the candidate name must match the payer name. Submit a scan of your enrollment slip and the official Score Report PDF within 2 days of the exam; claims are processed within 7 days. Alternatively, exchange for two free exam products of equal value and keep your original update service. Orders arrive by email within 1 minute — contact support if nothing arrives within 2 hours.
The official Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) outline defines 7 domains. The leading three are Debugging and Error Handling (7%), Objects, Functions, and Classes (25%), and Testing (7%). The full list is in the topics section above, and FreePdfDump's 149 practice questions cover each one.
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam contains 60 (plus up to 5 unscored pilot questions) to complete within 105 minutes. Timed simulation in the FreePdfDump Desktop Test Engine teaches that rhythm before exam day does.
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. Since requirements change over time, confirm the latest on the official Salesforce exam page before scheduling.
Three versions of the same study materials: a printable, expert-prepared PDF with free demo download and instant access; a Desktop Test Engine for Windows with customizable simulation and timed modes that works offline; and an Online Test Engine for any browser on Windows, Mac, Android, and iOS with test history and performance review. All 149 practice questions are identical across versions. Every purchase includes 365 days of free updates, a 50% renewal discount afterward, and unlimited computer installations.
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam requires 65% to pass, and registration costs $200 USD. A failed attempt means paying the same fee again — a readiness check with the FreePdfDump engines before booking is the cheaper option.
Online (proctored via Pearson VUE) or On-site (at a Pearson VUE testing center) Register for the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam through these official channels:
After booking, FreePdfDump delivers your practice questions within 1 minute — preparation starts the same day.
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:
コード：
01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03 if (array[i] === 4) {
04 array.splice(i, 1);
05 i--;
06 }
07 }
実行後の配列の値は何ですか？
- A. [1,2,3,4,4,5,4]
- B. [1,2,3,4,5,4,4]
- C. [1,2,3,4,5,4]
- D. [1,2,3,5]
Correct Answer: D 🗳️
Explanation: Only visible for FreePdfDump 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.querySelector( ' #row-as ' ).classes.push( ' priority-account ' );
- C. document.getElementById( ' row-as ' ).addClass( ' priority-account ' );
- D. document.querySelectorAll( ' #row-as ' ).classList.add( ' priority-account ' );
Correct Answer: A 🗳️
Explanation: Only visible for FreePdfDump members. You can sign-up / login (it's free).
インポートされたモジュールの厳格モードについて、正しい選択肢はどれですか？
- A. モジュール内の他のステートメントの前に use strict = false; というステートメントを追加して、notstrict モードを有効にします。
- B. 開発者はインポートしたモジュールから notStrict() 関数のみを参照できます。
- C. モジュール内の他のステートメントの前に use non-strict; というステートメントを追加して、notstrict モードを有効にします。
- D. インポートされたモジュールは、厳格モードとして宣言されているかどうかに関わらず、厳格モードで動作します。
Correct Answer: D 🗳️
Explanation: Only visible for FreePdfDump members. You can sign-up / login (it's free).
以下のコードブロックを参照してください。
01 let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
02 let output = 0;
03
04 for (let num of array) {
05 if (output > 10) {
06 break;
07 }
08 if (num % 2 == 0) {
09 continue;
10 }
11 output += num;
12 }
コード実行後の出力値は何ですか？
- A. 36
- B. 16
- C. 25
- D. 11
Correct Answer: B 🗳️
Explanation: Only visible for FreePdfDump members. You can sign-up / login (it's free).
修正されたコード:
let a = " * " ;
let b = " ** " ;
// x = 3;
console.log(a);
コードを実行すると何が表示されますか？
- A. null
- B. *
- C. 未定義
- D. ReferenceError: a が定義されていません
Correct Answer: B 🗳️
Explanation: Only visible for FreePdfDump members. You can sign-up / login (it's free).
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