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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 Duration: | 105 minutes |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Exam Format: | Multiple-select, Multiple-choice |
| Exam Price: | $200 USD |
| Passing Score: | 65% |
| Related Certifications: | Salesforce Certified JavaScript Developer I Credential |
| Certificate Validity Period: | None (Credential does not expire) |
| Available Languages: | English |
| 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 |
Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Browser and Events | 17% | - Browser-specific APIs - Event propagation (bubbling and capturing) - DOM manipulation - Browser Developer Tools usage - Interacting with forms and user input - Event handling and listeners |
| Topic 2: Debugging and Error Handling | 7% | - Custom error types - Error handling techniques (try/catch/finally) - Breakpoints and code inspection - Console methods for debugging |
| Topic 3: Objects, Functions, and Classes | 25% | - Higher-order functions - Arrow functions - Execution flow and context - Object creation and manipulation - Prototypal inheritance - Variable scope and closures - Modules and decorators - ES6 classes and inheritance - Function declarations and expressions |
| Topic 4: Asynchronous Programming | 13% | - Asynchronous patterns for business requirements - Event loop and execution flow - Promises (creation, chaining, error handling) - Callbacks - Async/Await syntax |
| Topic 5: Variables, Types, and Collections | 23% | - JSON parsing and manipulation - Type coercion and conversion - Arrays and collections - Primitive and complex data types - Variable declarations and initialization - Strings, numbers, and dates - Truthy and falsy evaluations |
| Topic 6: Server Side JavaScript | 8% | - Package management (npm) - Core Node.js modules - Server-side JavaScript implementations - CLI commands - Node.js fundamentals |
| Topic 7: Testing | 7% | - Writing and modifying unit tests - Test coverage and reliability - Test effectiveness evaluation - Unit testing concepts |
JavaScript-Developer-I日本語 Exam Facts, Digital Convenience and Global Support
- Server Side JavaScript (8%)
- Objects, Functions, and Classes (25%)
- Browser and Events (17%)
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:
Node.jsサーバーライブラリはイベントとコールバックを使用します。開発者は、サーバー起動時に発生するあらゆる問題をログに記録したいと考えています。
どのコードがイベントとともにエラーをログに記録しますか?
- A. server.on( ' error ' , (error) = > {
console.log( ' ERROR ' , error);
}); - B. server.error( ' error) = > {
console.log( ' ERROR ' , error);
}); - C. try {
server.start();
} catch(error) {
console.log( ' ERROR ' , error);
} - D. server.catch( ' error) = > {
console.log( ' ERROR ' , error);
});
Correct Answer: A 🗳️
Explanation: Only visible for TestKingFree members. You can sign-up / login (it's free).
開発者がチェックアウトボタンからHTMLクラス属性を削除したため、現在は単純に次のようになっています。
<ボタン>チェックアウト</ボタン>
チェックアウトボタンの存在を確認するテストがありますが、クラスが「blue」のボタンを探します。
該当するボタンが見つからないため、テストは失敗します。
このテストは、どのタイプのテストに分類されますか?
- A. 真の陰性
- B. 偽陽性
- C. 真陽性
- D. 偽陰性
Correct Answer: B 🗳️
Explanation: Only visible for TestKingFree members. You can sign-up / login (it's free).
以下のコードが与えられた場合:
01 function Person() {
02 this.firstName = ' John ' ;
03 }
04
05 Person.proto = {
06 job: x = > ' Developer '
07 });
08
09 const myFather = new Person();
10 const result = myFather.firstName + ' ' + myFather.job();
10行目が実行されたとき、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. ジョン未定義
- D. エラー: myFather.job は関数ではありません
Correct Answer: D 🗳️
Explanation: Only visible for TestKingFree members. You can sign-up / login (it's free).
以下の配列を参照してください。
arr = [1, 2, 3, 4, 5] とする。
どの2行のコードを実行すると、arr2という2つ目の配列が作成され、arr2はarrへの参照となるのでしょうか?
- A. let arr2 = arr.slice(0, 5);
- B. let arr2 = Array.from(arr);
- C. let arr2 = arr.sort();
- D. let arr2 = arr;
Correct Answer: C,D 🗳️
Explanation: Only visible for TestKingFree members. You can sign-up / login (it's free).
countsDeep() に対する try...catch の正しい実装:
- A. try {
setTimeout(function() {
countsDeep();
}, 1000);
} catch (e) {
handleError(e);
} - B. setTimeout(function() {
try {
countsDeep();
} catch (e) {
handleError(e);
}
}, 1000); - C. try {
countsDeep();
} handleError (e){
catch(e);
} - D. try {
setTimeout(function() {
countsDeep();
}, 1000);
} catch (e) {
handleError(e);
}
Correct Answer: B 🗳️
Explanation: Only visible for TestKingFree members. You can sign-up / login (it's free).
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