Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) : JavaScript-Developer-I日本語

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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101

What is the duration, language, and format of Salesforce JavaScript-Developer-I Exam

• There is a time limit of 105 minutes for the exam.
• The type of questions is Multiple Choice and situation-based questions.
• This exam is offered in only English.
• This exam consists of 60 questions
• Passing score 65%

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This course is designed for Javascript developers starting on the Salesforce platform who require programming customizations on front-end and back-end. There are no prerequisites for Salesforce JavaScript Developer I Exam. Typical job roles that align to the Salesforce Certified JavaScript Developer I are as follows:

• JavaScript programmer
• Full stack developer
• UI/UX Engineer
• Support engineer
• Technical Project Manager
• Front end developer
• Software/backend developer
• Salesforce developer
• Web application developer
• Technical Product Manager

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Average Salary for Salesforce JavaScript-Developer-I Exam Certified Professional

Salesforce JavaScript Developer roles are in great demand nowadays. The average salaries of Salesforce JavaScript Developer I exam Certified professional in:

• Europe - 63,500 Euro
• England - 60,200 POUND
• United State - 129,630 USD

Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:

Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:

Question #1
以下のコードを参照してください。
01 let country = {
02 get capital() {
03 let city = Number( " London " );
04
05 return {
06 cityString: city.toString(),
07 }
08 }
09 }
開発者は country.capital.cityString を参照する際に、どのような値を期待できますか？

A. ' London '
B. An error
C. NaN
D. undefined

Question #2
以下のコードを参照してください。
let inArray = [ [1, 2], [3, 4, 5] ];
どの2つの文が配列[1, 2, 3, 4, 5]を生成しますか？
(入力ミスを修正済み: usArray # inArray、.. # ....)

A. [].concat.apply(inArray, [] );
B. [].concat.apply({}, inArray);
C. [].concat(...inArray);
D. [].concat::...inArray();

Question #3
以下のJavaScriptコードを参照してください。
01 function filterDOM(searchString){
02 const parsedSearchString = searchString & " " & searchString.toLowerCase();
03 document.querySelectorAll( ' .account ' ).forEach(account = > {
04 const accountName = account.innerHTML.toLowerCase();
05 account.style.display = accountName.includes(parsedSearchString) ? /* ここにコードを挿入 */;
06 });
07 }
検索文字列に一致しないアカウントを非表示にするには、5行目のプレースホルダーコメントをどのコードに置き換えるべきですか？

A. ' hidden ' : ' visible '
B. ' block ' : ' none '
C. ' visible ' : ' hidden '
D. ' none ' : ' block '

Question #4
開発者がJavaScriptオブジェクトをコピーしました。
01 function Person() {
02 this.firstName = " John " ;
03 this.lastName = " Doe " ;
04 this.name = () = > `${this.firstName},${this.lastName}`;
05 }
06
07 const john = new Person();
08 const dan = Object.assign({}, john);
09 dan.firstName = ' Dan ' ;
開発者はどのようにしてダンの名(firstName)と姓(lastName)にアクセスするのですか？

A. dan.name()
B. dan.firstName + dan.lastName
C. dan.name
D. dan.firstName() + dan.lastName()

Question #5
2つの式var1とvar2が与えられたとき、2つの式を連結した結果を文字列型として返すための有効な方法を2つ挙げてください。

A. var1.toString() + var2.toString()
B. String(var1).concat(var2)
C. var1 + var2
D. String.concat(var1 + var2)

Solutions: