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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- Total Questions: 149
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Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Testing | 7% | - Test doubles and mocks - Testing frameworks and assertions - Unit testing concepts - Code coverage and best practices |
| Variables, Types, and Collections | 23% | - Truthy and falsy values - Variable declaration and initialization - Type coercion and conversion rules - JSON parsing and usage - Working with strings, numbers, dates, and booleans - Array methods and data manipulation |
| Browsers and Events | 17% | - Event handling, propagation, and delegation - Window and document object properties - Document Object Model (DOM) manipulation - Script loading and execution order - Browser APIs and Web Storage |
| Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Command-line tools and scripts - Core Node.js modules - Module system and require/import |
| Asynchronous Programming | 13% | - Event loop and micro/macro tasks - Callbacks and callback hell - Fetch API and HTTP requests - Async/await syntax - Promises and chaining |
| Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Closures and execution context - Decorators and advanced function patterns - Class syntax, inheritance, and prototypes - Modules and imports/exports - Object creation, properties, and methods |
| Debugging and Error Handling | 7% | - Defensive programming practices - Debugging tools and breakpoints - Error types and exception handling - Console methods and logging |
JavaScript-Developer-I日本語 Exam — Frequently Asked Questions
USD 200 (+ applicable taxes) per attempt, 65% to pass. Preparation is the cheaper insurance: the 149 practice questions from Lead2PassExam cost far less than a second registration.
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) blueprint spans 7 domains — including Debugging and Error Handling (7%), Variables, Types, and Collections (23%), Asynchronous Programming (13%). Follow the weightings with your hours; the full outline above details every subtopic.
Yes:
Training builds knowledge; simulation builds readiness. After any course, rehearse with the 149 practice questions for the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) until the exam atmosphere feels routine.
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Yes — download the free Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) demo to learn about our products before you buy. Purchases include 365 days of free updates, with each new version emailed to you immediately upon release; renew afterward at 50% off.
No formal prerequisites; 1–2 years of JavaScript development experience recommended Eligibility rules change over time, so confirm the current requirements on the official page (official JavaScript-Developer-I日本語 exam page) before you register.
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) is Salesforce's certification exam for Salesforce Certified JavaScript Developer I, at the Intermediate / Developer level — proof of practical skills that employers recognize. Our material for it is written by IT experts and certified trainers with a wealth of exam experience. Related credentials include Salesforce Certified Platform Developer I, Salesforce Certified Lightning Web Components Specialist.
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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 class Ship {
02 constructor(size) {
03 this.size = size;
04 }
05 }
06
07 class FishingBoat extends Ship {
08 constructor(size, capacity){
09 //Missing code
10 this.capacity = capacity;
11 }
12 displayCapacity() {
13 console.log( ' The boat has a capacity of ${this.capacity} people. ' );
14 }
15 }
16
17 let myBoat = new FishingBoat( ' medium ' , 10);
18 myBoat.displayCapacity();
コードに表示させるには、9行目にどのステートメントを追加すればよいでしょうか？
そのボートの定員は10人ですか？
- A. super.size = size;
- B. this.size = size;
- C. ship.size = size;
- D. super(size);
Correct Answer: D 🗳️
Explanation: Only visible for Lead2PassExam members. You can sign-up / login (it's free).
開発者は、数値の配列を受け取り、配列の最初の3つの数値の合計を返すsum3関数をテストするために、次のコードを作成しました。テストは合格しました。
01 let res = sum3([1, 2, 3]);
02 console.assert(res === 6);
03
04 res = sum3([1, 2, 3, 4]);
05 console.assert(res === 6);
別の開発者がsum3の動作を変更し、配列内のすべての数値を合計するようにしました。
更新されたsum3関数でテストを実行すると、どのような2つの結果が得られますか？
- A. 2行目のアサーションが失敗しました。
- B. 2行目のアサーションは合格です。
- C. 5行目のアサーションが失敗しました。
- D. 5行目のアサーションは合格です。
Correct Answer: B,C 🗳️
Explanation: Only visible for Lead2PassExam members. You can sign-up / login (it's free).
以下の2つのコードスニペットのうち、再帰関数の動作例を示しているのはどれですか？
- A. const sumToTen = numVar = > {
if (numVar < 0)
戻る;
return sumToTen(numVar + 1);
}; - B. const factorial = numVar = > {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar * factorial(numVar - 1);
}; - C. function factorial(numVar) {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar - 1;
} - D. let countingDown = function(startNumber) {
if (startNumber > 0) {
console.log(startNumber);
return countingDown(startNumber - 1);
} それ以外 {
開始番号を返します。
}
};
(注：オプションDは、小文字の改行と対応する括弧を用いた正しい構文で示されています。)
Correct Answer: B,D 🗳️
Explanation: Only visible for Lead2PassExam members. You can sign-up / login (it's free).
以下のコードを参照してください(Promise.race を使用することを前提としています)。
let cat3 = new Promise(resolve = >
setTimeout(resolve, 3000, "Cat 3 完了")
);
Promise.race([cat1, cat2, cat3])
.then(value = > {
let result = `${value} レース結果。`;
})
.catch(err = > {
console.log("レースがキャンセルされました: ", err);
});
(cat1とcat2は以前の例と同様で、cat2が最も早く解決されると仮定します。)Promise.raceが実行されたとき、resultの値は何ですか？
- A. レース中に1号車がクラッシュしました。
- B. 2号車はレースを完走しました。
- C. 3号車はレースを完走しました。
- D. レースは中止されました。
Correct Answer: B 🗳️
Explanation: Only visible for Lead2PassExam members. You can sign-up / login (it's free).
01 function Monster() { this.name = ' hello ' ; };
02 const m = Monster();
新しいキーワードが欠落している場合、何が起こりますか？
- A. m変数には正しいオブジェクトが割り当てられていますが、this.nameは未定義のままです。
- B. m変数には正しいオブジェクトが割り当てられています。
- C. window.m に正しいオブジェクトが割り当てられました。
- D. window.name には 'hello' が割り当てられ、変数 m は未定義のままです。
Correct Answer: D 🗳️
Explanation: Only visible for Lead2PassExam members. You can sign-up / login (it's free).
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