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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Passing Score: | 65% |
| Exam Price: | $200 USD |
| Available Languages: | English |
| Exam Duration: | 105 minutes |
| Exam Format: | Multiple-choice, Multiple-select |
| Related Certifications: | Salesforce Certified JavaScript Developer I Credential |
| Certificate Validity Period: | None (Credential does not expire) |
| Sample Questions: | DOWNLOAD DEMO |
| 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 |
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Asynchronous Programming | 13% | - Promises (creation, chaining, error handling) - Callbacks - Async/Await syntax - Asynchronous patterns for business requirements - Event loop and execution flow |
| Topic 2: Testing | 7% | - Writing and modifying unit tests - Test effectiveness evaluation - Test coverage and reliability - Unit testing concepts |
| Topic 3: Server Side JavaScript | 8% | - Core Node.js modules - CLI commands - Node.js fundamentals - Package management (npm) - Server-side JavaScript implementations |
| Topic 4: Variables, Types, and Collections | 23% | - Primitive and complex data types - JSON parsing and manipulation - Strings, numbers, and dates - Arrays and collections - Truthy and falsy evaluations - Variable declarations and initialization - Type coercion and conversion |
| Topic 5: Browser and Events | 17% | - DOM manipulation - Browser-specific APIs - Event handling and listeners - Browser Developer Tools usage - Event propagation (bubbling and capturing) - Interacting with forms and user input |
| Topic 6: Objects, Functions, and Classes | 25% | - Object creation and manipulation - Function declarations and expressions - Variable scope and closures - Execution flow and context - Prototypal inheritance - Arrow functions - ES6 classes and inheritance - Modules and decorators - Higher-order functions |
| Topic 7: Debugging and Error Handling | 7% | - Custom error types - Console methods for debugging - Breakpoints and code inspection - Error handling techniques (try/catch/finally) |
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The JavaScript-Developer-I日本語 exam is the official assessment for the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) certification from Salesforce. Across the wide landscape of IT certifications, this credential verifies that you can apply its published objectives in realistic scenarios — and since most candidates aim to succeed in one focused attempt, the quality of your practice material is the variable that matters most.
Passing the JavaScript-Developer-I日本語 exam requires 65%, and the registration fee is $200 USD. Since one focused attempt is the goal for most candidates, thorough practice beforehand protects both your score and your wallet.
Simply leave your email address, and our support team will send the free JavaScript-Developer-I日本語 exam demo to your inbox within 2 hours. This email delivery exists for a reason: it spares you the inconvenience of unsafe download links and online advertising. Your information is protected by strict encryption throughout, and never revealed to any company or individual. The demo itself is a genuine sample of the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) materials, finished by our IT expert team — quality you can verify before spending anything.
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.
The official outline organizes the JavaScript-Developer-I日本語 exam into weighted domains, including:
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) practice questions at PrepAwayETE are built around these same objectives — request the free demo by email to see how the content maps onto them.
The JavaScript-Developer-I日本語 exam contains 60 (plus up to 5 unscored pilot questions) questions with 105 minutes minutes to complete them. Timed practice under the same limits is the reliable way to make that constraint feel routine.
開発者がページ読み込み間でデータを保持するために利用できる、ブラウザ固有のAPIを3つ教えてください。
Correct Answer: A,B,E 🗳️
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
開発者がボタン付きのシンプルなウェブページを作成しています。ユーザーがこのボタンを初めてクリックすると、メッセージが表示されます。
開発者は以下のJavaScriptコードを記述しましたが、何かが欠けています。メッセージが初回クリック時だけでなく、ユーザーがボタンをクリックするたびに表示されてしまいます。
01 function listen(event) {
02
03 alert( 'やあ！僕はジョン・ドゥだよ' );
04
05 }
06 button.addEventListener('click', listen);
どの2行のコード行が、このコードを要求どおりに動作させるのでしょうか？
Correct Answer: A,C 🗳️
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
開発者はserver.jsファイルを使用してサーバーを起動し、サーバーを実行するために必要な依存関係をソースコードのpackage.jsonに追加します。
開発者はローカルでサーバーを起動するために、どのコマンドを実行すればよいですか？
Correct Answer: A 🗳️
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
値が与えられたとき、開発者はその値がNaNかどうかを検出するために、どの2つの方法を使用できますか？
Correct Answer: A,C 🗳️
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
以下のコードを参照してください(8行目でテンプレートリテラルを使用するように修正済み)。
01 let car1 = new Promise((_, reject) = >
02 setTimeout(reject, 2000, " Car 1 crashed in " )
03 );
04 let car2 = new Promise(resolve = >
05 setTimeout(resolve, 1500, " Car 2 completed " )
06 );
07 let car3 = new Promise(resolve = >
08 setTimeout(resolve, 3000, " Car 3 completed " )
09 );
10
11 Promise.race([car1, car2, car3])
12 .then(value = > {
13 let result = `${value} the race.`;
14 })
15 .catch(err = > {
16 console.log( " Race is cancelled. " , err);
17 });
Promise.raceが実行されたとき、resultの値は何ですか？
Correct Answer: B 🗳️
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
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