Apex Intermediate Progress | ( Lessons)

Lesson: 07 | Efficient Salesforce Apex Code: Refactoring Tips

Notes
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Notes

When writing Apex code in Salesforce, efficiency and clarity are key. In this article, we'll explore a simple refactoring technique to improve the readability and performance of your code.

The Original Code

// ❌ This can be refactored
List<Id> accIds = new List<Id>();
for (Account a : Trigger.new) {
    accIds.add(a.Id);
}
List<Account> accounts = [SELECT Id, Name, 
    (SELECT Id FROM Contacts) 
    FROM Account 
    WHERE Id IN :accIds];

System.debug('? ' + accounts);

The Problem

The code above iterates through each Account in Trigger.new, collects the Ids, and then queries the Account object based on these Ids. While this works, it involves unnecessary steps:

Creating a list accIds and manually adding each Account Id.
Using that list in the SOQL query to fetch the Account records.

The Refactored Code

// ✅ Refactor to this
List<Account> accounts = [SELECT Id, Name, 
    (SELECT Id FROM Contacts) 
    FROM Account 
    WHERE Id IN :Trigger.new];

System.debug('? ' + accounts);

Why This Refactor Works

By directly referencing Trigger.new in the WHERE clause of the SOQL query, you eliminate the need for an additional list and loop. Trigger.new is already a collection of the Account records being processed, so you can use it directly. This approach is not only more concise but also more efficient.

Key Takeaways

Simplify Loops: Avoid unnecessary loops when you can leverage existing collections like Trigger.new.
Direct Querying: Use Trigger.new directly in your SOQL queries for better performance.
Readability: Cleaner code is easier to read, maintain, and debug.

By applying these refactoring techniques, your Apex code will be more efficient and maintainable, leading to better performance in your Salesforce applications.

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Apex Intermediate

A. Apex DML Operations (8 lessons)

B. Apex Classes (17 lessons)

C. Apex Triggers (9 lessons)

D. Apex Exceptions (11 lessons)

E. Asynchronous Apex (6 lessons)

F. SOSL (10 lessons)

G. Testing Apex (9 lessons)

H. Apex Fast Recap (142 lessons)

I. Build Apex Coding Skills (64 lessons)

J. Miscellaneous (17 lessons)

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