PD1 Flashcards
Which statement results in an Apex compiler error?
A. Map<Id,Lead> lmap = new Map<Id,Lead>([Select ID from Lead Limit 8]);
B. Date d1 = Date.Today(), d2 = Date.ValueOf(‘2018-01-01’);
C. Integer a=5, b=6, c, d = 7;
D. List<string> s = List<string>{'a','b','c');</string></string>
D. List<string> s = List<string>{'a','b','c');
This contains a syntax error. The opening brace { is correct, but the closing bracket should also be a brace } instead of a parenthesis ). The correct statement should be:
List<string> s = new List<string>{'a','b','c'};</string></string></string></string>
What are two benefits of the Lightning Component framework? (Choose two.)
A. It simplifies complexity when building pages, but not applications.
B. It provides an event-driven architecture for better decoupling between components.
C. It promotes faster development using out-of-box components that are suitable for desktop and mobile devices.
D. It allows faster PDF generation with Lightning components.
The Lightning Component framework is a UI framework for developing dynamic web apps for mobile and desktop devices with no JavaScript required on the client side. Here are the benefits based on the given options:
A. It simplifies complexity when building pages, but not applications.
This statement is partly misleading. While Lightning does simplify the process of building pages, it’s also designed for application development. So, this isn’t a clear benefit statement.
B. It provides an event-driven architecture for better decoupling between components.
Correct. The event-driven architecture of the Lightning Component framework allows components to be more decoupled, making them more reusable and modular.
C. It promotes faster development using out-of-box components that are suitable for desktop and mobile devices.
Correct. The Lightning Component framework comes with a series of out-of-the-box components that can be used to accelerate development. These components are also responsive, making them suitable for both desktop and mobile devices.
D. It allows faster PDF generation with Lightning components.
This statement is not a core benefit of the Lightning Component framework. While you can create components that interact with services or tools that generate PDFs, the framework itself doesn’t inherently make PDF generation faster.
So, the two benefits of the Lightning Component framework from the given options are:
B. It provides an event-driven architecture for better decoupling between components.
C. It promotes faster development using out-of-box components that are suitable for desktop and mobile devices.
A method is passed a list of generic sObjects as a parameter.
What should the developer do to determine which object type (Account, Lead, or Contact, for example) to cast each sObject?
A. Use the first three characters of the sObject ID to determine the sObject type.
B. Use the getSObjectType method on each generic sObject to retrieve the sObject token. Most Voted
C. Use the getSObjectName method on the sObject class to get the sObject name.
D. Use a try-catch construct to cast the sObject into one of the three sObject types.
Out of the given options, the correct way to determine the type of a generic sObject is:
B. Use the getSObjectType method on each generic sObject to retrieve the sObject token.
When you call the getSObjectType method on a generic sObject, it returns the sObject token which can be used to determine its type. You can then convert that token to a string to get the name of the sObject type.
For instance:
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sObject sobj = new Account();
Schema.SObjectType sobjType = sobj.getSObjectType();
String objectName = sobjType.getDescribe().getName();
Option A is incorrect because the first three characters of the sObject ID correspond to the key prefix, and while they do determine the type, it’s not a recommended or direct way to get the sObject type.
Option C is incorrect as there isn’t a method called getSObjectName on the sObject class.
Option D is not a recommended approach because using try-catch to determine types (rather than handle actual exceptions) is not efficient or clear. It also doesn’t scale well if you have more than a few object types.
So, the best answer is:
B. Use the getSObjectType method on each generic sObject to retrieve the sObject token.
What should a developer use to implement an automatic Approval Process submission for Cases?
A. An Assignment Rule
B. Scheduled Apex
C. Process Builder
D. A Workflow Rule
To implement an automatic Approval Process submission for Cases, a developer should use:
C. Process Builder
With Process Builder, you can define criteria and actions. When the criteria are met, the actions are executed. One of the actions you can define is submitting a record for approval, which makes it suitable for automating Approval Process submission for Cases.
Option A, An Assignment Rule, is used for automatically assigning incoming cases (or leads) to particular users or queues based on criteria.
Option B, Scheduled Apex, could technically be used for this purpose, but it’s a more complex solution than necessary for this task.
Option D, A Workflow Rule, can automate standard internal procedures, but it doesn’t have the capability to submit records for approval.
Thus, the best choice is:
C. Process Builder.
When viewing a Quote, the sales representative wants to easily see how many discounted items are included in the Quote Line Items.
What should a developer do to meet this requirement?
A. Create a trigger on the Quote object that queries the Quantity field on discounted Quote Line Items.
B. Create a Workflow Rule on the Quote Line Item object that updates a field on the parent Quote when the item is discounted.
C. Create a roll-up summary field on the Quote object that performs a SUM on the quote Line Item Quantity field, filtered for only discounted Quote Line Items.
D. Create a formula field on the Quote object that performs a SUM on the Quote Line Item Quantity field, filtered for only discounted Quote Line Items.
Among the given options, the best way to meet the requirement is by using a roll-up summary field if the objects have a master-detail relationship.
C. Create a roll-up summary field on the Quote object that performs a SUM on the Quote Line Item Quantity field, filtered for only discounted Quote Line Items.
However, it’s important to note that for the roll-up summary field to be available, the relationship between the Quote and Quote Line Item objects must be a master-detail relationship. Salesforce natively supports roll-up summary fields on master-detail relationships, allowing the aggregation of child record data (in this case, the Quote Line Items) into the parent record (in this case, the Quote).
Option A: A trigger could accomplish the task, but using native features like roll-up summary fields is preferred over writing code whenever possible due to easier maintenance, better transparency, and less complexity.
Option B: Workflow rules are used for field updates, tasks, email alerts, and outbound messages. They are not ideal for this requirement, especially since roll-up operations aren’t directly supported by workflows.
Option D: Formula fields are for real-time calculations and cannot iterate over child records like a roll-up would, so they can’t be used to aggregate data from child records in the manner described in the requirement.
Thus, the best choice is:
C. Create a roll-up summary field on the Quote object that performs a SUM on the Quote Line Item Quantity field, filtered for only discounted Quote Line Items.
A Developer wants to get access to the standard price book in the org while writing a test class that covers an OpportunityLineItem trigger.
Which method allows access to the price book?
A. Use Test.getStandardPricebookId() to get the standard price book ID. Most Voted
B. Use @IsTest(SeeAllData=true) and delete the existing standard price book.
C. Use Test.loadData() and a Static Resource to load a standard price book.
D. Use @TestVisible to allow the test method to see the standard price book.
Out of the given options, the correct way to access the standard price book in a test class in Salesforce is:
A. Use Test.getStandardPricebookId() to get the standard price book ID.
The method Test.getStandardPricebookId() is provided specifically to allow developers to get the ID of the standard price book in a test context without requiring access to all data.
Option B is not advisable. Using @IsTest(SeeAllData=true) means the test method will see all the data in the org, which can lead to unpredictable test results and isn’t a best practice. Furthermore, you shouldn’t delete the existing standard price book.
Option C isn’t correct for this context. While Test.loadData() is useful for loading test data from static resources, you don’t typically need to use it for accessing standard price books.
Option D isn’t applicable in this context. @TestVisible is an annotation that makes private class members visible to test methods. It doesn’t have relevance to accessing standard price books.
So, the best choice is:
A. Use Test.getStandardPricebookId() to get the standard price book ID.
Which two Apex data types can be used to reference a Salesforce record ID dynamically? (Choose two.)
A. ENUM
B. sObject Most Voted
C. External ID
D. String Most Voted
To reference a Salesforce record ID dynamically, the following two Apex data types can be used:
B. sObject: In Apex, an sObject can be any object (standard or custom). When you query a record, it is returned as an sObject type, and you can get its ID dynamically.
D. String: A Salesforce record ID is represented as a 15-character or 18-character string. Therefore, you can use a string data type to hold or reference a Salesforce record ID.
Option A (ENUM) is not relevant for referencing Salesforce record IDs.
Option C (External ID) is a user-defined field that allows you to store a unique identifier for a record from another system. While it can help in upsert operations, the external ID itself is not a data type to reference a Salesforce record ID.
So, the correct answers are:
B. sObject
D. String
Where can a developer identify the time taken by each process in a transaction using Developer Console log inspector?
A. Performance Tree tab under Stack Tree panel
B. Execution Tree tab under Stack Tree panel
C. Timeline tab under Execution Overview panel
D. Save Order tab under Execution Overview panel
In the Developer Console’s log inspector, the time taken by each process in a transaction can be identified in the:
C. Timeline tab under Execution Overview panel
The Timeline tab provides a graphical representation of the time taken by each process in a transaction, making it easy to identify and analyze performance bottlenecks.
The other options:
A. Performance Tree tab: This is not an actual tab in the Developer Console.
B. Execution Tree tab: This is not an actual tab in the Developer Console.
D. Save Order tab: This is not related to identifying the time taken by each process.
Thus, the correct answer is:
C. Timeline tab under Execution Overview panel.
Which two platform features align to the Controller portion of MVC architecture? (Choose two.)
A. Process Builder actions Most Voted
B. Workflow rules Most Voted
C. Standard objects
D. Date fields
The MVC (Model-View-Controller) architecture divides software development into three interconnected components:
Model: Represents the data structures and business logic.
View: Represents the UI of the application.
Controller: Manages the user input and updates the Model and View accordingly.
Given the options and thinking about Salesforce:
A. Process Builder actions: This can be thought of as a Controller because it can take user input or detect changes in records and then execute actions (like changing data or calling other processes).
B. Workflow rules: Similar to Process Builder, workflow rules can be seen as a Controller. They evaluate criteria and then take actions based on changes or inputs.
C. Standard objects: These are more aligned with the Model as they represent data structures and relationships in Salesforce.
D. Date fields: These are part of the Model since they represent a data structure or attribute of an object.
So, the two platform features that align to the Controller portion of MVC architecture are:
A. Process Builder actions
B. Workflow rules
A developer needs to test an Invoicing system integration. After reviewing the number of transactions required for the test, the developer estimates that the test data will total about 2 GB of data storage. Production data is not required for the integration testing.
Which two environments meet the requirements for testing? (Choose two.)
A. Developer Sandbox
B. Full Sandbox Most Voted
C. Developer Edition
D. Partial Sandbox Most Voted
E. Developer Pro Sandbox
Given the requirements provided, we should choose the environments based on their storage capacities and functionalities:
A. Developer Sandbox: This type of sandbox includes a copy of your production organization’s configuration (metadata) but no production data. It only provides a limited amount of storage (e.g., 200 MB for file and data storage combined), which is not sufficient for the 2 GB of data needed for testing.
B. Full Sandbox: A Full Sandbox copies all of your production organization’s data and metadata. It has the same storage limit as your production environment, so it can handle the 2 GB of test data. This is one of the correct choices.
C. Developer Edition: Developer Edition orgs are stand-alone environments and not sandboxes. They come with a very limited amount of storage (e.g., 5 MB for data and 20 MB for files), which is far below the required 2 GB for testing.
D. Partial Sandbox: Partial Sandboxes include your production organization’s metadata and a sample of your production data, defined by a sandbox template. The storage limit for a Partial Sandbox is 5 GB for data and 5 GB for files, which can accommodate the 2 GB of test data required. This is another correct choice.
E. Developer Pro Sandbox: A Developer Pro Sandbox includes a copy of your production organization’s configuration (metadata) but no production data. It provides more storage than a regular Developer Sandbox (e.g., 1 GB for data and files combined), but this might still be insufficient for the 2 GB of data needed for testing.
The two environments that meet the requirements for testing are:
B. Full Sandbox
D. Partial Sandbox
A developer working on a time management application wants to make total hours for each timecard available to application users. A timecard entry has a Master-
Detail relationship to a timecard.
Which approach should the developer use to accomplish this declaratively?
A. A Visualforce page that calculates the total number of hours for a timecard and displays it on the page
B. A Roll-Up Summary field on the Timecard Object that calculates the total hours from timecard entries for that timecard
C. A Process Builder process that updates a field on the timecard when a timecard entry is created
D. An Apex trigger that uses an Aggregate Query to calculate the hours for a given timecard and stores it in a custom field
Given that a timecard entry has a Master-Detail relationship to a timecard, the most suitable and declarative approach to calculate the total hours for each timecard would be:
B. A Roll-Up Summary field on the Timecard Object that calculates the total hours from timecard entries for that timecard
Roll-Up Summary fields are a native feature of Salesforce that allows aggregation of data from child records (detail) into the parent record (master) in Master-Detail relationships.
Let’s review the other options:
A. A Visualforce page: This is not a purely declarative option. While it can display the calculated total hours, it introduces additional complexity and is less efficient than using a Roll-Up Summary field.
C. A Process Builder process: While Process Builder can update fields based on criteria, it’s not the best tool for aggregating data from child records to a parent record. Using Roll-Up Summary fields is more efficient for this purpose.
D. An Apex trigger: This is not a declarative approach. Although it can be used to aggregate data, it requires writing, testing, and maintaining code. When there’s a declarative solution available (like Roll-Up Summary fields), it’s recommended to use that solution for simplicity and ease of maintenance.
Thus, the best choice is:
B. A Roll-Up Summary field on the Timecard Object that calculates the total hours from timecard entries for that timecard.
A developer encounters APEX heap limit errors in a trigger.
Which two methods should the developer use to avoid this error? (Choose two.)
A. Use the transient keyword when declaring variables.
B. Query and store fields from the related object in a collection when updating related objects.
C. Remove or set collections to null after use.
D. Use SOQL for loops instead of assigning large queries results to a single collection and looping through the collection.
APEX heap limit errors occur when the memory being used by the variables, collections, and other transient elements in the code exceeds the limit set by Salesforce. To avoid these errors, the following methods can be employed:
C. Remove or set collections to null after use: After processing the data in a collection, it’s a good practice to set the collection to null or clear it to free up heap memory.
D. Use SOQL for loops instead of assigning large queries results to a single collection and looping through the collection: SOQL for loops allow you to iterate over the records returned by a SOQL query without holding them all in memory at once. This approach minimizes heap size usage as compared to fetching all records into a collection and then looping through the collection.
Let’s review the other options:
A. Use the transient keyword when declaring variables: The transient keyword is mainly used in Visualforce controllers to ensure that the variable doesn’t retain its value between requests, helping to reduce view state size. It doesn’t reduce the heap size in APEX triggers.
B. Query and store fields from the related object in a collection when updating related objects: This method might not necessarily reduce heap size. In fact, if you’re querying additional data and storing it in memory, it might increase the heap size, depending on the amount of data.
Thus, the best choices are:
C. Remove or set collections to null after use.
D. Use SOQL for loops instead of assigning large query results to a single collection and looping through the collection.
Which approach should be used to provide test data for a test class?
A. Query for existing records in the database.
B. Execute anonymous code blocks that create data.
C. Use a test data factory class to create test data.
D. Access data in @TestVisible class variables.
The best practice for providing test data for a test class is:
C. Use a test data factory class to create test data.
Using a test data factory helps in centralizing the test data creation logic, making it easier to maintain and reuse across multiple test classes. It ensures that your test data is consistent, and you don’t have to rewrite the same data creation logic repeatedly for different test methods or classes.
Let’s analyze the other options:
A. Query for existing records in the database: This is not a recommended approach because test methods should be able to run in any org, regardless of the existing data. Relying on production data can lead to flaky tests that might fail in different environments. By default, Salesforce test methods don’t have access to existing data unless SeeAllData=true is used, which is generally discouraged.
B. Execute anonymous code blocks that create data: This method is used for executing Apex code snippets on the fly, usually from the developer console. It’s not an appropriate or efficient way to provide test data for a test class.
D. Access data in @TestVisible class variables: The @TestVisible annotation allows test methods to access private or protected members (variables, methods) of other classes directly. This doesn’t pertain directly to the creation of test data but rather to the accessibility of specific variables or methods during testing.
Thus, the most recommended approach is:
C. Use a test data factory class to create test data.
Which approach should a developer take to automatically add a Maintenance Plan to each Opportunity that includes an Annual Subscription when an opportunity is closed?
A. Build a OpportunityLineItem trigger that adds a PriceBookEntry record.
B. Build an OpportunityLineItem trigger to add an OpportunityLineItem record.
C. Build an Opportunity trigger that adds a PriceBookEntry record.
D. Build an Opportunity trigger that adds an OpportunityLineItem record.
To automatically add a “Maintenance Plan” to each Opportunity that includes an “Annual Subscription” when an opportunity is closed, we need to consider the following:
The “Maintenance Plan” would be a type of product or service, which in Salesforce would be represented by an OpportunityLineItem (since it’s related to a specific opportunity).
“Annual Subscription” would also be an OpportunityLineItem under the Opportunity.
When an opportunity is closed, the trigger should evaluate the existing OpportunityLineItems to check if there’s an “Annual Subscription”. If there is, then another OpportunityLineItem for the “Maintenance Plan” should be added to the Opportunity.
Considering the options:
A. Build an OpportunityLineItem trigger that adds a PriceBookEntry record: This is incorrect because adding a PriceBookEntry wouldn’t achieve the requirement. We need to add an OpportunityLineItem related to the Opportunity.
B. Build an OpportunityLineItem trigger to add an OpportunityLineItem record: This could work, but it might not be the most efficient. If an Opportunity has multiple line items, the trigger would run for each line item, which could lead to inefficiencies or recursion.
C. Build an Opportunity trigger that adds a PriceBookEntry record: This is incorrect for the same reason as option A.
D. Build an Opportunity trigger that adds an OpportunityLineItem record: This is the best approach. By building a trigger on the Opportunity object, you can check when the Opportunity status changes to closed, evaluate the associated OpportunityLineItems for “Annual Subscription”, and then add a new OpportunityLineItem for the “Maintenance Plan” if needed.
The most appropriate answer is:
D. Build an Opportunity trigger that adds an OpportunityLineItem record.
Which two statements are true about using the @testSetup annotation in an Apex test class? (Choose two.)
A. The @testSetup annotation cannot be used when the @isTest(SeeAllData=True) annotation is used. Most Voted
B. Test data is inserted once for all test methods in a class. Most Voted
C. Records created in the @testSetup method cannot be updates in individual test methods.
D. The @testSetup method is automatically executed before each test method in the test class is executed.
The @testSetup annotation in Apex is used to define methods that set up test data for test classes. Here are the correct statements regarding its usage:
A. The @testSetup annotation cannot be used when the @isTest(SeeAllData=True) annotation is used: This statement is true. If @isTest(SeeAllData=True) is defined for a class, @testSetup cannot be used. This is because @testSetup is meant to isolate test data, while SeeAllData=True provides access to organisation data.
B. Test data is inserted once for all test methods in a class: This statement is also true. Methods with the @testSetup annotation are run once before any test method in the test class. This helps to reduce the redundancy of test data setup for each test method and can help to improve the performance of test execution.
Regarding the other options:
C. Records created in the @testSetup method cannot be updated in individual test methods: This statement is false. Records created in a @testSetup method are accessible and can be updated in individual test methods. However, changes made to these records within a test method are only available to that specific test method.
D. The @testSetup method is automatically executed before each test method in the test class is executed: This statement is false. The @testSetup method is executed only once before any test method in the class, not before each test method.
So, the correct answers are:
A. The @testSetup annotation cannot be used when the @isTest(SeeAllData=True) annotation is used.
B. Test data is inserted once for all test methods in a class.
What is the requirement for a class to be used as a custom Visualforce controller?
A. Any top-level Apex class that has a constructor that returns a PageReference
B. Any top-level Apex class that extends a PageReference
C. Any top-level Apex class that has a default, no-argument constructor Most Voted
D. Any top-level Apex class that implements the controller interface
For a class to be used as a custom Visualforce controller:
C. Any top-level Apex class that has a default, no-argument constructor.
This means that the class should have a constructor that takes no arguments. Visualforce uses this constructor when it instantiates the controller or extension to ensure it can create an instance without passing parameters.
Regarding the other options:
A. Any top-level Apex class that has a constructor that returns a PageReference: While a custom controller or extension can have methods that return a PageReference to redirect the user to different pages, this is not a requirement for the class to act as a controller.
B. Any top-level Apex class that extends a PageReference: This is not accurate. PageReference is not something you typically extend for a custom controller.
D. Any top-level Apex class that implements the controller interface: There’s no specific “controller interface” in Apex that classes must implement to be used as a custom Visualforce controller.
So, the correct answer is:
C. Any top-level Apex class that has a default, no-argument constructor.
A newly hired developer discovers that there are multiple triggers on the case object.
What should the developer consider when working with triggers?
A. Developers must dictate the order of trigger execution.
B. Trigger execution order is based on creation date and time.
C. Unit tests must specify the trigger being tested.
D. Trigger execution order is not guaranteed for the same sObject.
The correct statement regarding trigger execution in Salesforce is:
D. Trigger execution order is not guaranteed for the same sObject.
Multiple triggers for the same event (e.g., before update, after insert) on the same sObject are not guaranteed to execute in any specific order. This can sometimes lead to unexpected behavior if there are multiple triggers on the same object, especially if those triggers have conflicting operations. It’s a best practice to have one trigger per object and use that trigger to call classes or methods to keep the logic organized and avoid conflicts.
Regarding the other options:
A. Developers must dictate the order of trigger execution: Developers cannot dictate the order of execution for multiple triggers on the same sObject.
B. Trigger execution order is based on creation date and time: This statement is false. Salesforce does not guarantee trigger execution order based on creation date and time.
C. Unit tests must specify the trigger being tested: This is not accurate. When testing, you usually aim to test the logic and functionality rather than specifying which trigger to run. The trigger runs based on the DML operations in the test method.
So, the correct answer is:
D. Trigger execution order is not guaranteed for the same sObject.
How should a developer prevent a recursive trigger?
A. Use a ג€one trigger per objectג€ pattern.
B. Use a static Boolean variable.
C. Use a trigger handler.
D. Use a private Boolean variable.
To prevent a recursive trigger, the most common and recommended approach is:
B. Use a static Boolean variable.
By using a static Boolean variable, you can ensure the trigger only runs once during the transaction. For instance:
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public class TriggerHelper {
public static Boolean isTriggerAlreadyRun = false;
}
In the trigger:
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trigger MyTrigger on MyObject__c (before insert) {
if(!TriggerHelper.isTriggerAlreadyRun) {
TriggerHelper.isTriggerAlreadyRun = true;
// trigger logic here
}
}
However, some other options are related to best practices or patterns:
A. Use a ‘one trigger per object’ pattern: While this is a best practice to maintain trigger organization and readability, it doesn’t inherently prevent recursion.
C. Use a trigger handler: This is another best practice to move logic out of the trigger itself and into a class (handler). This makes the logic more modular and maintainable. A trigger handler often uses a static Boolean variable to prevent recursion, so it’s somewhat related but isn’t the direct answer to the question.
D. Use a private Boolean variable: A private Boolean variable would not maintain its state across trigger executions in the same transaction. Hence, it wouldn’t prevent recursion. Only static variables maintain their state across trigger executions in the same transaction.
So, the most direct answer to the question is:
B. Use a static Boolean variable.
Which three options can be accomplished with formula fields? (Choose three.)
A. Generate a link using the HYPERLINK function to a specific record.
B. Display the previous value for a field using the PRIORVALUE function.
C. Determine if a datetime field value has passed using the NOW function.
D. Return and display a field value from another object using the VLOOKUP function.
E. Determine which of three different images to display using the IF function.
Among the given options, the three tasks that can be accomplished using formula fields are:
A. Generate a link using the HYPERLINK function to a specific record.
This function creates a link to a URL or a Salesforce record. For example, HYPERLINK(“/” & Id, Name) would create a link to the record itself using the record’s name as the link text.
C. Determine if a datetime field value has passed using the NOW function.
The NOW() function returns the current date and time. You can use it in comparisons with datetime fields to see if a certain date and time have passed.
E. Determine which of three different images to display using the IF function.
The IF() function allows for conditional logic. You can use it in conjunction with the IMAGE() function to display different images based on certain criteria.
For clarity:
B. Display the previous value for a field using the PRIORVALUE function.
The PRIORVALUE function is used in workflow field update formulas and not in formula fields to get the previous value of a field.
D. Return and display a field value from another object using the VLOOKUP function.
There is no VLOOKUP function in Salesforce formula fields. This function is more associated with Excel. In Salesforce, you’d typically use relationships to get data from related objects.
So, the correct options are:
A. Generate a link using the HYPERLINK function to a specific record.
C. Determine if a datetime field value has passed using the NOW function.
E. Determine which of three different images to display using the IF function.
What is a capability of the <ltng:require> tag that is used for loading external Javascript libraries in Lightning Component? (Choose three.)
A. Loading files from Documents.
B. One-time loading for duplicate scripts.
C. Specifying loading order.
D. Loading scripts in parallel.
E. Loading externally hosted scripts.</ltng:require>
The <ltng:require> tag in Lightning Components is used to include external JavaScript/CSS libraries. Among the given options, the capabilities of the <ltng:require> tag are:</ltng:require></ltng:require>
B. One-time loading for duplicate scripts.
If the same script is requested multiple times (maybe from different components), the Lightning framework ensures it’s loaded only once.
C. Specifying loading order.
You can specify the order of scripts using the afterScriptsLoaded attribute. The scripts specified in the scripts attribute are loaded first, and once they’re all loaded, any functions specified in afterScriptsLoaded are executed.
D. Loading scripts in parallel.
The Lightning framework loads the scripts specified in the scripts attribute in parallel for performance reasons, but the callback in afterScriptsLoaded ensures that your specified function only runs after all those scripts are loaded.
Regarding the other options:
A. Loading files from Documents.
Files from Documents are not directly loadable using <ltng:require>. Typically, you'd load libraries from static resources.</ltng:require>
E. Loading externally hosted scripts.
It’s a best practice to load scripts from Salesforce’s static resources rather than externally hosted scripts to ensure they’re available in Salesforce’s security context and to improve performance. The Lightning Locker Service also imposes restrictions which can make working with externally hosted scripts more complex.
So, the correct capabilities are:
B. One-time loading for duplicate scripts.
C. Specifying loading order.
D. Loading scripts in parallel.
A Platform Developer needs to write an Apex method that will only perform an action if a record is assigned to a specific Record Type.
Which two options allow the developer to dynamically determine the ID of the required Record Type by its name? (Choose two.)
A. Make an outbound web services call to the SOAP API.
B. Hardcode the ID as a constant in an Apex class.
C. Use the getRecordTypeInfosByName() method in the DescribeSObjectResult class.
D. Execute a SOQL query on the RecordType object.
To dynamically determine the ID of a Record Type by its name, a developer has a couple of options:
C. Use the getRecordTypeInfosByName() method in the DescribeSObjectResult class.
This method provides a way to get the record type information by name without the need for any SOQL query.
Regarding the other options:
A. Make an outbound web services call to the SOAP API.
This approach is not efficient, especially when you can get the record type ID directly in Apex. Making an external callout also has governor limits and can introduce unnecessary complexity.
B. Hardcode the ID as a constant in an Apex class.
Hardcoding IDs is not recommended because IDs can change between environments (e.g., sandbox to production) and can lead to problems when migrating code.
So, the correct options are:
C. Use the getRecordTypeInfosByName() method in the DescribeSObjectResult class.
D. Execute a SOQL query on the RecordType object.
A developer has the controller class below.
Which code block will run successfully in an execute anonymous window?
A. myFooController m = new myFooController(); System.assert(m.prop !=null);
B. myFooController m = new myFooController(); System.assert(m.prop ==0);
C. myFooController m = new myFooController(); System.assert(m.prop ==null);
D. myFooController m = new myFooController(); System.assert(m.prop ==1);
However, let’s assume some basic behaviors:
If prop is an instance property of type Integer and is not initialized, its default value will be null.
If prop is a static property of type Integer and is not initialized, its default value will still be null.
Based on the above general behaviors:
Option A is checking if prop is not null.
Option B is checking if prop is 0.
Option C is checking if prop is null.
Option D is checking if prop is 1.
If prop is an instance variable of type Integer and hasn’t been initialized in the constructor or elsewhere in the class, the correct answer would be:
C. myFooController m = new myFooController(); System.assert(m.prop == null);
Again, this is based on the assumption, and the actual answer might vary depending on the content of the “myFooController” class.
In a single record, a user selects multiple values from a multi-select picklist.
How are the selected values represented in Apex?
A. As a List<String> with each value as an element in the list
B. As a String with each value separated by a comma
C. As a String with each value separated by a semicolon
D. As a Set<String> with each value as an element in the set</String></String>
In Apex, the selected values from a multi-select picklist are represented:
C. As a String with each value separated by a semicolon
So, when working with multi-select picklist values in Apex, you often need to use methods like split(‘;’) to convert the string into a list of individual values.
What are two valid options for iterating through each Account in the collection List<Account> named AccountList? (Choose two.)
A. for (Account theAccount : AccountList) {ג€¦}
B. for(AccountList) {ג€¦}
C. for (List L : AccountList) {ג€¦}
D. for (Integer i=0; i < AccountList.Size(); i++) {ג€¦}</Account>
The valid options for iterating through each Account in the collection List<Account> named AccountList are:</Account>
A. for (Account theAccount : AccountList) {…}
D. for (Integer i=0; i < AccountList.Size(); i++) {…}
These are the standard ways to iterate through lists in Apex, either using the enhanced for loop (for-each style) or the traditional for loop using an index.
Given:
Map<ID, Account> accountMap = new Map>ID, Account> ([SELECT Id, Name FROM Account]);
What are three valid Apex loop structures for iterating through items in the collection? (Choose three.)
A. for (ID accountID : accountMap.keySet()) {ג€¦}
B. for (Account accountRecord : accountMap.values()) {ג€¦}
C. for (Integer i=0; I < accountMap.size(); i++) {ג€¦}
D. for (ID accountID : accountMap) {ג€¦}
E. for (Account accountRecord : accountMap.keySet()) {ג€¦}
Given the Map<ID, Account> accountMap, the valid loop structures for iterating through items in the collection are:
A. for (ID accountID : accountMap.keySet()) {…}
This loops through the set of keys (in this case, IDs) of the map.
B. for (Account accountRecord : accountMap.values()) {…}
This loops through the collection of values (in this case, Account records) of the map.
D. for (ID accountID : accountMap) {…}
This is a shorthand way to loop through the keys of the map.
Options C and E are not valid for the following reasons:
C. The structure provided is the typical loop structure for lists and arrays. However, you cannot directly index into a map using an integer. Maps are not ordered lists.
E. accountMap.keySet() returns a set of IDs, so trying to loop through them and assign each ID to an Account variable would result in a type mismatch.
So, the correct answers are A, B, and D.
