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

How to Prepare for Salesforce JavaScript Developer I Exam

Preparation Guide for Salesforce JavaScript Developer I Exam

Introduction

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

Difficulty in Writing of Salesforce JavaScript-Developer-I Exam

As Javascript development observed in nearly all organizations, Salesforce JavaScript-Developer-I is the most successful qualification candidates can get on their resume. Professionals have therefore been known to demonstrate concern. But this JavaScript-Developer-I can be very easy to clear if practitioners study with JavaScript-Developer-I exam dumps and then take the JavaScript-Developer-I practice exams. However, with accurate focusing and proper planning content, candidates will clear the test. With the aid of these materials, aspirants get reasonable idea about the kind of questions they pose in actual certification, the certification questions provides the most-represented JavaScript-Developer-I practice exams. The Salesforce experts check BraindumpStudy JavaScript-Developer-I exam dumps. Certification questions also include a test for practise and is an ideal forum for checking the information achieved.

Topics of Salesforce JavaScript Developer I Exam

Aspirants must know the exam topics before they start of preparation. Because it will help them to prepare for the below concepts Salesforce JavaScript-Developer-I exam will include the following topics:

1. Variable, Types, and Collection: 23%

Scenario based coding Variables Creation and Initialization JSON object understanding

2. Object, Functions, and Classes: 25%

Implementation of different functions Understanding of different modules of Javascript Scope of variables and their execution flow

3. Browser and Events: 17%

Handling and propagation of events Development tools of browsers Understanding of browser specific APIs

4. Asynchronous Programming: 13%

Asynchrounous programming different concepts Monitoring and management of different loops

5. Server Side Javascript: 8%

Implementation of Node.js Understanding of Node.js CLI commands

6. Testing: 7%

Unit Testing effectiveness of different tests

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For more info read reference:

Salesforce JavaScript-Developer-I Certification leaning site Salesforce JavaScript-Developer-Is Certification resources

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
このコードはブラウザのコンソールで、次のうちどの3つのアクションを実行できますか？

A. ページのパフォーマンスを示すレポートを表示します。
B. セキュリティクッキーの表示と変更。
C. ページの JavaScript コードを表示、変更、デバッグします。
D. ページのDOMを表示および変更します。
E. ページに関係のないコードを実行します。

Question #2
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. ship.size = size;
B. super.size = size;
C. super(size);
D. this.size = size;

Question #3
Universal Containersでは、各チームがJavaScriptオブジェクトをコピーする独自の方法を採用しています。以下のコードスニペットは、あるチームの実装例を示しています。
01 function Person() {
02 this.firstName = " John " ;
03 this.lastName = " Doe " ;
04 this.name = () = > {
05 console.log( ' Hello ${this.firstName} ${this.lastName} ' );
06 }
07 }
08
09 const john = new Person();
10 const dan = JSON.parse(JSON.stringify(john)); // (intended deep copy)
11 dan.firstName = ' Dan ' ;
12 dan.name();
(元の10行目は、論理的にはJSON.parse(JSON.stringify(john))を実行してJSONクローンを作成するものです。)このコードを実行した結果はどうなりますか？

A. TypeError: dan.name は関数ではありません
B. こんにちは、ジョン・ドゥ
C. こんにちは、ダン・ドー
D. こんにちは、ダン

Question #4
文字列置換を可能にするコンソールログ出力方法：

A. 情報
B. ログ
C. assert
D. メッセージ
E. エラー

Question #5
JavaScript:
01 function Tiger() {
02 this.type = 'Cat';
03 this.size = 'large';
04 }
05
06 let tony = new Tiger();
07 tony.roar = () = > {
08 console.log( ' 彼らは素晴らしい！ ' );
09 };
10
11 function Lion() {
12 this.type = 'Cat';
13 this.size = 'large';
14 }
15
16 let leo = new Lion();
17 // ここにコードを挿入
18 leo.roar();
18行目を有効にするために、17行目に挿入できる2つの文はどれですか？

A. leo.roar = () = > { console.log( ' 彼らはかなり良い！ ' ); };
B. leo.prototype.roar = () = > { console.log( ' 彼らはかなり良い！ ' ); };
C. Object.assign(leo, Tiger);
D. Object.assign(leo, tony);

Solutions: