Salesforce Salesforce Developer JavaScript-Developer-I-JPN

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

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

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

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

How to Study the Salesforce JavaScript-Developer-I Exam

The best study material one can get is the JavaScript-Developer-I practice exam dumps. To ensure good grades, do attempt the JavaScript-Developer-I practice exams. The JavaScript Developer I from Salesforce typically has 1-2 years of experience as a JavaScript developer with the following JavaScript topics.

• Activities

• Objects & Arrays: Data Structures

• Conversion type (inclusive versus explicit)

• Monitor (agnostic platform)

• Scope of Variables

• Discharge

• Functions (more functions in higher order)

• JavaScript on the backend

• Item Model Document

• Asynchronous Programming

• Forms of data and operators

• Modules

• Strings

• Control of Mistake

• Classes

To prepare for this test, we advise a combination of practical experience, completion of training courses, pathways and self-study in the areas listed in the examination outline section of this examination guide.

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

Question #1
開発者はNode.jsサーバーをセットアップしており、ソースコードのルートディレクトリに、実行時にサーバーを起動するスクリプトindex.jsを作成しています。開発者は、コードが実行されるフォルダの場所を必要とする変数を宣言しています。
スクリプト内で使用できるグローバル変数はどれですか？

A. window.location
B. __ファイル名
C. this.path
D. __dirname

Question #2
以下のコードを参照してください。
01 let obj = {
02 foo: 1,
03 bar: 2
04 }
05 let output = []
06
07 for (let something of obj) {
08 output.push(something);
09 }
10
11 console.log(output);
11行目の出力値は何ですか？

A. 7行目のfor_of文の誤った使用によりエラーが発生します。
B. [1, 2]
C. [ " foo:1 " , " bar:2 " ]
D. [ " foo " , " bar " ]

Question #3
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. 05 return result;
B. 02 arr.map((result, current) = > {
C. 04 result = result + current;
D. 03 if(arr.length == 0) { return 0; }

Question #4
元のコード:
01 let requestPromise = client.getRequest;
03 requestPromise().then((response) = > {
04 handleResponse(response);
05 });
開発者は、PromiseベースのGETリクエストで発生するエラーを適切に処理したいと考えています。
どのコード修正が正しいですか？

A. Promiseチェーンに.catchを追加する
B. (Aの複製)
C. エラーにはfinallyハンドラを使用する
D. requestPromise().then(...) の前後に try/catch ブロックを記述

Question #5
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.getTime()
C. console.timeLog()
D. console.trace()

Solutions: