DEX-450試験無料問題集（202題）「Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience 認定」

出題：1

Universal Containers is developing a new Lightning web component for their marketing department. They want to ensure that the component is fine-tuned and provides a seamless user experience.
What are some benefits of using the Lightning Component framework?

A. Automatic support for accessibility standards

B. Better performance due to client-side rendering

C. Easy integration with third-party libraries

D. Compatibility with all web browsers

正解：B 解答を投票する

出題：2

A developer created a Lightning web component called statuscomponent to be Inserted into the Account record page.
Which two things should the developer do to make this component available?
Choose 2 answers

A. Add <target>lightning RecordPage</target> to the statusComp .js-meta.xml file.

B. Add <mastertabel>Account </masterLabel> to the statusComponent. js-meta.xm1 file.

C. Add <targer>lightning_Recordpage</target> to the statuscomponent. js file,

D. Set isExposes to true In the statuscomponent.js-meta.xml file.

正解：A,B 解答を投票する

出題：3

What is the value of the Trigger.old context variable in a before insert trigger?

A. null

B. Undefined

C. A list of newly created sObjects without IDs

D. An empty list of sObjects

正解：A 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：4

A developer must troubleshoot to pinpoint the causes of performance issues when a custom page loads in their org.
Which tool should the developer use to troubleshoot query performance?

A. Developer Console

B. AppExchange

C. Setup Menu

D. Visual Studio Code IDE

正解：A 解答を投票する

出題：5

The value of the account type field is not being displayed correctly on the page. Assuming the custom controller is properly referenced on the Visualforce page, what should the developer do to correct the problem?

A. Change theAccount attribute to public.

B. Add with sharing to the custom controller.

C. Add a getter method for the actType attribute.

D. Convert theAccount.Type to a String.

正解：C 解答を投票する

出題：6

An Opportunity needs to have an amount rolled up from a custom object that is not in a master-detail relationship.
How can this be achieved?

A. Use the Streaming API to create real-time roll-up summaries.

B. Use the Metadata API to create real-time roll-up summaries.

C. Write a trigger on the child object and use an aggregate function to sum the amount for all related child objects under the Opportunity.

D. Write a trigger on the Opportunity object and use tree sorting to sum the amount for all related child objects under the Opportunity.

正解：C 解答を投票する

出題：7

Consider the following code snippet:

Given the multi-tenant architecture of the Salesforce platform, what is a best practice a developer should implement and ensure successful execution of the method?

A. Avoid using variables as query filters.

B. Avoid performing queries inside for loops.

C. Avoid executing queries without a limit clause.

D. Avoid returning an empty List of records.

正解：B 解答を投票する

出題：8

A developer is creating an app that contains multiple Lightning web components.
One of the child components is used for navigation purposes. When a user clicks a button called Next in the child component, the parent component must be alerted so it can navigate to the next page.
How should this be accomplished?

A. Fire a notification.

B. Update a property on the parent.

C. Create a custom event.

D. Call a method in the Apex controller.

正解：C 解答を投票する

出題：9

Assuming that name is a String obtained by an tag on a Visualforce page, which two SOQL queries performed are safe from SOQL injection? Choose 2 answers

A.

B.

C.

D.

正解：A,B 解答を投票する

出題：10

Universal Containers wants to ensure that all new leads created in the system have a valid email address. They have already created a validation rule to enforce this requirement, but want to add an additional layer of validation using automation.
What would be the best solution for this requirement?

A. Use a before-save Apex trigger on the Lead object to validate the email address and display an error message if it is invalid

B. Submit a REST API Callout with a JSON payload and validate the fields on a third party system

C. Use an Approval Process to enforce the completion of a valid email address using an outbound message action.

D. Use a custom Lightning Web component to make a callout to validate the fields on a third party system.

正解：A 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

DEX-450試験無料問題集「Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience 認定」