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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Debugging and Error Handling | 7% | - Error types and exception handling - Console methods and logging - Debugging tools and breakpoints - Defensive programming practices |
| Browsers and Events | 17% | - Window and document object properties - Script loading and execution order - Event handling, propagation, and delegation - Document Object Model (DOM) manipulation - Browser APIs and Web Storage |
| Server-Side JavaScript | 8% | - Module system and require/import - Core Node.js modules - Command-line tools and scripts - Node.js fundamentals and runtime |
| Testing | 7% | - Code coverage and best practices - Test doubles and mocks - Unit testing concepts - Testing frameworks and assertions |
| Variables, Types, and Collections | 23% | - Working with strings, numbers, dates, and booleans - Truthy and falsy values - Type coercion and conversion rules - Variable declaration and initialization - Array methods and data manipulation - JSON parsing and usage |
| Asynchronous Programming | 13% | - Fetch API and HTTP requests - Event loop and micro/macro tasks - Promises and chaining - Async/await syntax - Callbacks and callback hell |
| Objects, Functions, and Classes | 25% | - Class syntax, inheritance, and prototypes - Closures and execution context - Object creation, properties, and methods - Function definitions, parameters, and scope - Modules and imports/exports - Decorators and advanced function patterns |
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:
以下のコードを参照してください。
01 < html lang= " en " >
02 < table onclick= " console.log( ' Table log ' ); " >
03 < tr id= " row1 " >
04 < td > Click me! < /td >
05 < /tr >
06 < /table >
07 < script >
08 function printMessage(event) {
09 console.log( ' Row log ' );
10 event.stopPropagation();
11 }
12
13 let elem = document.getElementById( ' row1 ' );
14 elem.addEventListener( ' click ' , printMessage, false);
15 < /script >
16 < /html >
「Click me!」がクリックされたときに、コンソールに以下の内容がログとして出力されるようにするには、どのコードを変更すればよいですか？
行ログ
テーブルログ
- A. 13行目と14行目を削除します
- B. 10行目をevent.stopPropagation(false);に変更します。
- C. 10行目を削除
- D. 14行目を elem.addEventListener( ' click ' , printMessage, true); に変更してください。
Correct Answer: C 🗳️
Explanation: Only visible for Actual4Exams 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 let obj = {
02 foo: 1,
03 bar: 2
04 }
05 let output = []
06
07 for (let something of obj) {
08 output.push(something);
09 }
10
11 console.log(output);
11行目の出力値は何ですか？
- A. [ " foo " , " bar " ]
- B. [1, 2]
- C. [ " foo:1 " , " bar:2 " ]
- D. 7行目のfor_of文の誤った使用によりエラーが発生します。
Correct Answer: D 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
テストでは以下を検索します：
<button class="blue">チェックアウト</button>
しかし、実際のHTMLは次のとおりです。
<ボタン>チェックアウト</ボタン>
テストが失敗するのは、既に存在しないクラスを想定しているためです。
これはどのような種類のテスト結果ですか？
- A. 真の陰性
- B. 偽陰性
- C. 偽陽性
- D. 真陽性
Correct Answer: B 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
コードを参照してください。
01 console.log( ' Start ' );
02 Promise.resolve( ' Success ' ).then(function(value) {
03 console.log( ' Success ' );
04 });
05 console.log( ' End ' );
コードが正常に実行された後の出力は何ですか？
- A. Start
End
Success - B. Success
Start
End - C. End
Start
Success - D. Start
Success
End
Correct Answer: A 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
01 function changeValue(obj) {
02 obj.value = obj.value / 2;
03 }
04 const objA = {value: 10};
05 const objB = objA;
06
07 changeValue(objB);
08 const result = objA.value;
コード実行後のresultの値は何ですか？
- A. 10
- B. 5
- C. 未定義
- D. 低
Correct Answer: B 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
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Viewing questions 1-5 out of 149 questions.
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This means that if due to any reason you are not able to pass the JavaScript-Developer-I日本語 actual exam even after using our product, we will reimburse the full amount you spent on our products. you just need to mail us your score report along with your account information to address listed below within 7 days after your unqualified certificate came out.
