In this hands-on challenge, you will create a custom Apex class that implements the Iterable. You will then use this class to iterate over a collection of items within a for loop. This exercise will help you understand how to simplify iteration in Apex using the Iterable interface.

Prework:

• Ensure you have access to a Salesforce Developer Org or a Trailhead Playground.

• Familiarize yourself with basic Apex programming concepts.

• Review the Salesforce documentation on the Iterable interfaces.

• Create a custom Apex class: ** Name: MyIterable

• • Implements: Iterable
• • Class variable: private List strings

• Create a constructor for MyIterable:

• • Argument: List strings
• • Initializes the class variable strings from the constructor’s argument strings

• Implement the iterator method:

• • Return type: Iterator
• • Returns an iterator for the strings list strings.iterator();

• Create a test class:

• • Name: MyIterableTest
• • Annotation: @IsTest

• Add a test method to the test class:

• • Name: testIterableForLoop
• • Type: void()
• • Annotation: @IsTest

• Steps:

• • Create a list of strings: List strings
• • Values: ‘Hello’,’World’
• • Create an instance of MyIterable with the list of strings.
• • Use a for loop to iterate over the MyIterable instance.
• • Print each string using System.debug.

• Run the test class:

• Open the Developer Console

• • Navigate to the Test menu
• • Select New Run
• • Select the MyIterableTest class and run the test

• Verify the Output ** Check the debug logs to verify that the for loop iterated over the collection and printed each string.

• • Expected Output:
• • The debug logs should display the following output:
• • • DEBUG | Hello
• • • DEBUG | World