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Reference: https://trailhead.salesforce.com/en/academy/classes/dex450-build-applications-programmatically-on-the-salesforce-platform/

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Salesforce certifications are an excellent way for professionals to demonstrate their expertise in the Salesforce ecosystem. The Salesforce Certified Programmers are responsible for developing innovative applications using Salesforce technologies. These developers are skilled in Apex, Visualforce, and Lightning. The Salesforce DEX-450 Certification Exam is specifically designed to test the developers' programming abilities using Apex and Visualforce in the Lightning Experience.

Salesforce DEX-450 exam is a great way for developers to prove their expertise in programmatic development using Apex and Visualforce in Lightning Experience. It validates an individual's understanding of the programming concepts, best practices, and techniques that are necessary for developing custom applications and automating business processes in Salesforce. Programmatic Development using Apex and Visualforce in Lightning Experience certification is a must-have for developers who want to advance their careers in the Salesforce ecosystem.

Salesforce DEX-450 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Asynchronous Apex10%- Batch Apex
  • 1. Database.Batchable interface
  • 2. start(), execute(), and finish() methods
  • 3. Database.Stateful
- Future Methods
  • 1. @future annotation
  • 2. AsyncRequestLimit exceeded handling
Topic 2: Apex Transaction Management10%- Transaction Control
  • 1. System.debug() usage
  • 2. Database methods with allOrNone parameter
  • 3. Savepoint and rollback
- Governor Limits
  • 1. DML statement limits
  • 2. SOQL query limits
  • 3. CPU time and heap size limits
Topic 3: Apex Classes and Interfaces12%- Apex Classes
  • 1. Inheritance and virtual/abstract classes
  • 2. Class structure (attributes, methods, constructors)
  • 3. Access modifiers (public, private, protected, global)
- Apex Interfaces
  • 1. Interface definition and implementation
  • 2. When to use interfaces
Topic 4: Visualforce Pages8%- VF Standard Components
  • 1. ,
  • 2. Action methods and pageReference
  • 3. , ,
- VF Page Basics
  • 1. Visualforce expressions
  • 2. component structure
  • 3. Controllers and controller extensions
Topic 5: Apex Testing13%- Testing Best Practices
  • 1. Using seeAllData=false for isolated tests
  • 2. Assert statement usage
  • 3. Coverage requirements (75% for deployment)
- Test Classes
  • 1. Test data creation methods
  • 2. Test.startTest() and Test.stopTest()
  • 3. @isTest annotation
Topic 6: Apex Fundamentals10%- Apex Basics
  • 1. Apex variables and data types
  • 2. DML operations (insert, update, delete, etc.)
  • 3. Apex operators and control flow statements
  • 4. Using SOQL to query Salesforce data
- Apex Primitives
  • 1. ID and sObject types
  • 2. Date, Datetime, Time classes
  • 3. Integer, Double, Long, String, Boolean types
Topic 7: Apex Triggers12%- Trigger Best Practices
  • 1. Handler class patterns
  • 2. Recursive trigger prevention
  • 3. One trigger per object pattern
- Trigger Syntax and Context Variables
  • 1. Trigger.newMap and Trigger.oldMap
  • 2. Trigger events (before insert, after insert, etc.)
  • 3. Trigger.old and Trigger.new context variables
Topic 8: Working with Data - SOQL and SOSL15%- SOQL (Salesforce Object Query Language)
  • 1. Query options (LIMIT, ORDER BY, WHERE)
  • 2. Relationship queries (parent-child, child-parent)
  • 3. Aggregate functions (COUNT, SUM, AVG, MIN, MAX)
  • 4. Basic SOQL queries
- SOSL (Salesforce Object Search Language)
  • 1. SOSL syntax and use cases
  • 2. Returning sObjects from SOSL
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