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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- Total Questions: 149
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How to Prepare for Salesforce JavaScript Developer I Exam
Preparation Guide for Salesforce JavaScript Developer I Exam
Introduction
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What is the duration, language, and format of Salesforce JavaScript-Developer-I Exam
- The type of questions is Multiple Choice and situation-based questions.
- This exam consists of 60 questions
- This exam is offered in only English.
- There is a time limit of 105 minutes for the exam.
- Passing score 65%
How to book the Salesforce JavaScript-Developer-I Exam
There are the following steps for registering the Salesforce JavaScript Developer I exam. Step 1: Visit Salesforce Exam Registration Step 2: Signup/Login to Salesforce account Step 4: Select Date, time and confirm with the payment method
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Asynchronous Programming | 13% | - Callbacks - Asynchronous patterns for business requirements - Async/Await syntax - Promises (creation, chaining, error handling) - Event loop and execution flow |
| Topic 2: Server Side JavaScript | 8% | - Server-side JavaScript implementations - CLI commands - Core Node.js modules - Node.js fundamentals - Package management (npm) |
| Topic 3: Variables, Types, and Collections | 23% | - Truthy and falsy evaluations - Primitive and complex data types - Strings, numbers, and dates - Type coercion and conversion - Variable declarations and initialization - Arrays and collections - JSON parsing and manipulation |
| Topic 4: Browser and Events | 17% | - Interacting with forms and user input - DOM manipulation - Event handling and listeners - Event propagation (bubbling and capturing) - Browser Developer Tools usage - Browser-specific APIs |
| Topic 5: Testing | 7% | - Test coverage and reliability - Writing and modifying unit tests - Unit testing concepts - Test effectiveness evaluation |
| Topic 6: Debugging and Error Handling | 7% | - Custom error types - Error handling techniques (try/catch/finally) - Breakpoints and code inspection - Console methods for debugging |
| Topic 7: Objects, Functions, and Classes | 25% | - Variable scope and closures - ES6 classes and inheritance - Higher-order functions - Execution flow and context - Function declarations and expressions - Modules and decorators - Prototypal inheritance - Arrow functions - Object creation and manipulation |
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:
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. 25
- C. 11
- D. 16
Correct Answer: D 🗳️
Explanation: Only visible for PrepAwayExam members. You can sign-up / login (it's free).
Universal Containers(UC)は新しいランディングページを公開したが、ユーザーからウェブサイトの動作が遅いとの苦情が寄せられている。開発者は、この問題の原因となっている可能性のある関数をいくつか発見した。これを検証するため、開発者はすべての実行を行い、疑わしい3つの関数それぞれが消費する時間をログに記録することにした。
01 console.time( 'パフォーマンス' );
02
03 maybeAHeavyFunction();
04
05 thisCouldTakeTooLong();
06
07 orMaybeThisOne();
08
09 console.endTime( 'パフォーマンス' );
開発者は、3つの関数それぞれに費やされた時間を取得するために、どの関数を使用できますか？
- A. console.timeStamp()
- B. console.trace()
- C. console.getTime()
- D. console.timeLog()
Correct Answer: D 🗳️
Explanation: Only visible for PrepAwayExam members. You can sign-up / login (it's free).
開発者は配列の要素の合計を計算する関数を作成する必要があるが、コードを実行するたびに「undefined」というエラーが発生する。開発者は、以下のコードに何が不足しているかを特定する必要がある。
01 const sumFunction = arr = > {
02 return arr.reduce((result, current) = > {
03 //
04 result += current;
05 //
06 }, 10);
07 };
どの行を置換すれば、コードが期待どおりに動作するようになりますか？
- A. 02 arr.map((result, current) = > {
- B. 03 if(arr.length == 0) { return 0; }
- C. 04 result = result + current;
- D. 05 return result;
Correct Answer: D 🗳️
Explanation: Only visible for PrepAwayExam members. You can sign-up / login (it's free).
以下のコードを参照してください(テンプレートリテラルのバッククォートが欠落していた箇所を修正しています)。
let codeName = ' Bond ' ;
let sampleText = `名前は${codeName}、ジム${codeName}です`;
開発者は、特定の部分文字列が文字列の一部であるかどうかを判定しようとしている。
どの3つのコード文がtrueを返しますか？
- A. sampleText.includes( ' Jim ' , 4);
- B. sampleText.includes( ' Jim ' );
- C. sampleText.includes( ' The ' , 1);
- D. sampleText.substring( ' Jim ' );
- E. sampleText.indexOf( ' Bond ' ) !== -1;
Correct Answer: A,B,E 🗳️
Explanation: Only visible for PrepAwayExam members. You can sign-up / login (it's free).
開発者は、DatePrettyPrint というモジュールを使用したいと考えています。
このモジュールは、printDate() というデフォルト関数を 1 つエクスポートします。
開発者はどのようにしてprintDate()をインポートして使用できますか？
- A. import printDate from ' /path/DatePrettyPrint.js ' ;
DatePrettyPrint.printDate(); - B. import printDate from ' /path/DatePrettyPrint.js ' ;
printDate(); - C. import DatePrettyPrint() from ' /path/DatePrettyPrint.js ' ;
printDate(); - D. import DatePrettyPrint from ' /path/DatePrettyPrint.js ' ;
DatePrettyPrint.printDate();
Correct Answer: B 🗳️
Explanation: Only visible for PrepAwayExam members. You can sign-up / login (it's free).
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