Certification has become a widely used yardstick for assessing a professional's skills, and that explains the steady stream of candidates toward JavaScript-Developer-I日本語. ExamCost supports them with 149 practice questions for Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版), structured so preparation feels purposeful.
Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Debugging and Error Handling | 7% | - Console methods for debugging - Breakpoints and code inspection - Custom error types - Error handling techniques (try/catch/finally) |
| Topic 2: Browser and Events | 17% | - Event handling and listeners - Interacting with forms and user input - Browser Developer Tools usage - Browser-specific APIs - DOM manipulation - Event propagation (bubbling and capturing) |
| Topic 3: Server Side JavaScript | 8% | - Node.js fundamentals - Server-side JavaScript implementations - Core Node.js modules - Package management (npm) - CLI commands |
| Topic 4: Testing | 7% | - Writing and modifying unit tests - Unit testing concepts - Test effectiveness evaluation - Test coverage and reliability |
| Topic 5: Asynchronous Programming | 13% | - Promises (creation, chaining, error handling) - Callbacks - Asynchronous patterns for business requirements - Event loop and execution flow - Async/Await syntax |
| Topic 6: Variables, Types, and Collections | 23% | - Primitive and complex data types - Arrays and collections - Type coercion and conversion - Variable declarations and initialization - Truthy and falsy evaluations - Strings, numbers, and dates - JSON parsing and manipulation |
| Topic 7: Objects, Functions, and Classes | 25% | - Function declarations and expressions - Variable scope and closures - Arrow functions - Higher-order functions - Modules and decorators - ES6 classes and inheritance - Prototypal inheritance - Execution flow and context - Object creation and manipulation |
JavaScript-Developer-I日本語 Exam Questions and Answers
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) content is the same across all three formats: a printable PDF, a software engine, and an online engine. The free demo lets you try each interface before buying, so you can pick the one that matches how you study rather than guessing.
The package contains 149 practice questions for the JavaScript-Developer-I日本語 exam, all verified by our IT experts. A free demo is available so you can review the style before you buy.
- Testing (7%)
- Debugging and Error Handling (7%)
- Objects, Functions, and Classes (25%)
Use the weights above to divide your study time where it matters most.
The engine presents Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) questions in random order, so each session feels like a fresh test rather than a memorized list. After every simulated exam you receive a score, and your errors are clearly marked, which makes it easy to see your weak and strong areas and build a focused study plan.
The real JavaScript-Developer-I日本語 exam gives you 105 minutes minutes for 60 (plus up to 5 unscored pilot questions) questions. The engine lets you rehearse under the same kind of time pressure, so pacing decisions become automatic.
To pass JavaScript-Developer-I日本語 you need 65%, and the official fee is $200 USD. Setting the target score early makes it easier to measure your progress in practice tests.
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.
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);
- B. super.size = size;
- C. this.size = size;
- D. ship.size = size;
Correct Answer: A 🗳️
Explanation: Only visible for ExamCost members. You can sign-up / login (it's free).
修正されたコード:
let a = " * " ;
let b = " ** " ;
// x = 3;
console.log(a);
コードを実行すると何が表示されますか？
- A. *
- B. ReferenceError: a が定義されていません
- C. null
- D. 未定義
Correct Answer: A 🗳️
Explanation: Only visible for ExamCost members. You can sign-up / login (it's free).
開発者は、新しいWebフレームワーク/ライブラリ(Minimalist.js)ではなく、成熟していてサポート体制が整っているWebフレームワーク/ライブラリを推奨したいと考えている。
どちらの2つをおすすめすべきでしょうか？
- A. Koa
- B. Vue
- C. React
- D. Express
Correct Answer: B,C 🗳️
Explanation: Only visible for ExamCost members. You can sign-up / login (it's free).
修正されたコード:
let obj = {
foo: 1,
bar: 2
};
let output = [];
for (let something in obj) {
output.push(something);
}
console.log(出力);
11行目の出力は何ですか？
- A. [ " foo " , " bar " ]
- B. [ " foo:1 " , " bar:2 " ]
- C. [ " bar " , " foo " ]
- D. [1, 2]
Correct Answer: A 🗳️
Explanation: Only visible for ExamCost 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 factorial = numVar = > {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar * factorial(numVar - 1);
}; - B. function factorial(numVar) {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar - 1;
} - C. 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。) - D. const sumToTen = numVar = > {
if (numVar < 0)
戻る;
return sumToTen(numVar + 1);
};
Correct Answer: A,C 🗳️
Explanation: Only visible for ExamCost members. You can sign-up / login (it's free).
Viewing page 1 out of 30 pages.
Viewing questions 1-5 out of 149 questions.
