100% Money Back Guarantee

TestKingFree has an unprecedented 99.6% first time pass rate among our customers. We're so confident of our products that we provide no hassle product exchange.

  • Best exam practice material
  • Three formats are optional
  • 10 years of excellence
  • 365 Days Free Updates
  • Learn anywhere, anytime
  • 100% Safe shopping experience

JavaScript-Developer-I日本語 Online Test Engine

  • Online Tool, Convenient, easy to study.
  • Instant Online Access JavaScript-Developer-I日本語 Dumps
  • Supports All Web Browsers
  • JavaScript-Developer-I日本語 Practice Online Anytime
  • Test History and Performance Review
  • Supports Windows / Mac / Android / iOS, etc.
  • Try Online Engine Demo
  • Total Questions: 149
  • Updated on: Oct 26, 2026
  • Price: $79.00

JavaScript-Developer-I日本語 Desktop Test Engine

  • Installable Software Application
  • Simulates Real JavaScript-Developer-I日本語 Exam Environment
  • Builds JavaScript-Developer-I日本語 Exam Confidence
  • Supports MS Operating System
  • Two Modes For JavaScript-Developer-I日本語 Practice
  • Practice Offline Anytime
  • Software Screenshots
  • Total Questions: 149
  • Updated on: Oct 26, 2026
  • Price: $79.00

JavaScript-Developer-I日本語 PDF Practice Q&A's

  • Printable JavaScript-Developer-I日本語 PDF Format
  • Prepared by Salesforce Experts
  • Instant Access to Download JavaScript-Developer-I日本語 PDF
  • Study Anywhere, Anytime
  • 365 Days Free Updates
  • Free JavaScript-Developer-I日本語 PDF Demo Available
  • Download Q&A's Demo
  • Total Questions: 149
  • Updated on: Oct 26, 2026
  • Price: $79.00

Paper books had their century — heavy to carry, tedious to read, impossible to search on a commute. The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) bank at TestKingFree replaces all of that with JavaScript-Developer-I日本語 content you download once and study wherever you happen to be.

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:

SectionWeightObjectives
Topic 1: Browser and Events17%- 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 Handling7%- Custom error types
- Error handling techniques (try/catch/finally)
- Breakpoints and code inspection
- Console methods for debugging
Topic 3: Objects, Functions, and Classes25%- 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 Programming13%- Asynchronous patterns for business requirements
- Event loop and execution flow
- Promises (creation, chaining, error handling)
- Callbacks
- Async/Await syntax
Topic 5: Variables, Types, and Collections23%- 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 JavaScript8%- Package management (npm)
- Core Node.js modules
- Server-side JavaScript implementations
- CLI commands
- Node.js fundamentals
Topic 7: Testing7%- 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

Roughly 60 (plus up to 5 unscored pilot questions) questions in 105 minutes minutes. Timed sessions with 149 practice questions for the JavaScript-Developer-I日本語 exam at TestKingFree teach you to spend those minutes wisely.
The official Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) outline distributes its emphasis like this:
  • Server Side JavaScript (8%)
  • Objects, Functions, and Classes (25%)
  • Browser and Events (17%)
Anchor your plan on the heaviest domains and verify each one with the TestKingFree bank.
Three reasons come up again and again. The material is dependable — 149 practice questions for the JavaScript-Developer-I日本語 exam with verified answers, checked daily. The format is liberating — fully digital Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) content that lives on your phone and travels anywhere. And the service is tireless — support staff work in shifts across time zones, so a question sent at midnight gets the same care as one sent at noon.
You need 65% to pass, and the fee is $200 USD per attempt. Solid preparation with verified TestKingFree material protects that investment far better than a last-minute gamble.
Anyone who grew up with paper study guides knows their faults: heavy in the bag, dull to slog through, outdated the moment the vendor changes the outline. The JavaScript-Developer-I日本語 package at TestKingFree fixes all three — the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) bank downloads to your phone and every other device, reads comfortably at any hour in any place, and receives free updates for 365 days. Your library weighs nothing and never goes stale.
Yes. TestKingFree serves customers in many different countries, so the after-sales team works in shifts — twenty-four hours a day, seven days a week. Wherever you are and whenever a question about your JavaScript-Developer-I日本語 material comes up, someone is online and ready to help, because the operating philosophy here is that the customer comes first.
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:

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);
    });
Reveal Solution  Discussion  0

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
Reveal Solution  Discussion  0

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
Reveal Solution  Discussion  0

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;
Reveal Solution  Discussion  0

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);
    }
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

Explanation: Only visible for TestKingFree members. You can sign-up / login (it's free).

Viewing page 1 out of 30 pages.
Viewing questions 1-5 out of 149 questions.

3%

0 Customer ReviewsCustomers Feedback (* Some similar or old comments have been hidden.)

LEAVE A REPLY

Your email address will not be published. Required fields are marked *

Instant Download JavaScript-Developer-I日本語

After Payment, our system will send you the products you purchase in mailbox in a minute after payment. If not received within 2 hours, please contact us.

365 Days Free Updates

Free update is available within 365 days after your purchase. After 365 days, you will get 50% discounts for updating.

Porto

Money Back Guarantee

Full refund if you fail the corresponding exam in 60 days after purchasing. And Free get any another product.

Security & Privacy

We respect customer privacy. We use McAfee's security service to provide you with utmost security for your personal information & peace of mind.