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Salesforce Sample Questions (Q66-Q71):

NEW QUESTION # 66
開発者は、ユーザのチェックボックスの選択に基づいて子コンポーネントを条件付きで表示する Lightning Web コンポーネントの Jest テストを作成しています。
各シナリオで正しいコンポーネントが表示または非表示になることを適切にテストするには、開発者は何をすべきでしょうか?

Answer: B

Explanation:
The best way to properly test that the correct components display and hide for each scenario is to reset the DOM after each test with the afterEach() method. The afterEach() method is a lifecycle hook that runs after each test, and can be used to perform cleanup tasks, such as removing the elements from the DOM, resetting the mocks, or clearing the caches. This ensures that each test runs in a clean and isolated environment, and does not affect the results of other tests. Creating a new describe block for each test will not help, as the describe block is used to group related tests, but it does not reset the DOM after each test. Creating a teardown block to reset the DOM after each test will not work, as there is no such block in Jest, and the developer should use the afterEach() method instead. Creating a new jsdom instance for each test will not work, as jsdom is a JavaScript implementation of the DOM and HTML standards, and it is not a part of Jest, but a dependency that Jest uses to provide a browser-like environment. The developer should use the document object provided by Jest to manipulate the DOM, and use the afterEach() method to reset it. Reference: [Testing Lightning Web Components], [Jest Documentation]


NEW QUESTION # 67
開発者は、任意の 2 つのオブジェクトレコード間の Salesforce 名項目を比較する汎用 Apex メソッドを作成したいと考えています。たとえば、取引先と商談の名前フィールドを比較します。またはアカウント名と連絡先。
Name フィールドが存在すると仮定すると、開発者はこれをどのように行うべきでしょうか?

Answer: B


NEW QUESTION # 68
<apex:commandButton> がアクションの処理中に別のテキストを表示するには、開発者はどのタグを使用する必要がありますか?

Answer: D

Explanation:
The <apex:actionStatus> tag in Visualforce is used to display the status of an AJAX request, such as showing different text while a command button is processing an action.References: Visualforce Developer Guide - apex:actionStatus


NEW QUESTION # 69
以下のマークアップを参照してください。
HTML
<template>
<lightning-record-form
record-id={recordId}
object-api-name="Account"
layout-type="Full">
</lightning-record-form>
</template>
Lightning Webコンポーネントは、取引先名と、オブジェクトに存在する275個のカスタム項目のうち2つを表示します。カスタム項目は正しく宣言され、値も入力されています。しかし、開発者はコンポーネントのパフォーマンスが遅いという苦情を受けています。開発者はパフォーマンスを改善するために何をすればよいでしょうか？

Answer: C

Explanation:
The lightning-record-form is a powerful, high-level component that simplifies data entry and display.
However, its performance is heavily influenced by the layout-type attribute. When layout-type="Full" is used, the component fetches and renders every single field defined on the object's "Full" page layout in the Salesforce metadata. In this case, the Account object has 275 fields. Fetching and rendering such a large volume of metadata and data causes a significant performance lag, even if the user only cares about three specific fields.
To improve performance, the developer should switch from a layout-based approach to a field-based approach. By removing the layout-type attribute and adding the fields attribute (Option A), the developer can pass an array of only the specific field API names required (e.g., ['Name', 'CustomField1__c',
'CustomField2__c']). This drastically reduces the amount of data requested from the Lightning Data Service (LDS) and minimizes the DOM elements the browser needs to render. Option C is incorrect because "Partial" is not a valid value for layout-type; the only supported values are "Full" and "Compact". Option B only affects the visual spacing of the fields and does not reduce the data load. Option A is the direct and most effective way to optimize component responsiveness by limiting the data scope.


NEW QUESTION # 70
Visuzlforce ページは、表示されるデータが大量であるため、読み込みに時間がかかります。
開発者はパフォーマンスを向上させるためにどの戦略を使用できますか?

Answer: A


NEW QUESTION # 71
......

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