Learn Apex - 10 Code Examples & CST Typing Practice Test
Apex is a strongly typed, object-oriented programming language developed by Salesforce for building scalable, secure, and automated applications on the Salesforce platform. It allows developers to execute business logic on the server side, integrate external systems, and customize CRM workflows using a syntax similar to Java.
Learn APEX with Real Code Examples
Updated Nov 19, 2025
Practical Examples
Before/after insert trigger
REST API endpoint
Batch job processing thousands of records
Scheduled Apex cleanup
CRUD operations with SOQL
Troubleshooting
Check governor limits
Avoid SOQL inside loops
Use bulkified triggers
Validate API request limits
Monitor async job failures
Testing Guide
Write @isTest classes
Use Test.startTest() & Test.stopTest()
Cover bulk scenarios
Mock callouts using HttpCalloutMock
Maintain 75%+ code coverage
Deployment Options
SFDX CLI
Change Sets
Unlocked Packages
Managed Packages
Metadata API
Tools Ecosystem
Salesforce Developer Console
VS Code with Salesforce Extensions
Salesforce CLI (SFDX)
Workbench
Salesforce Inspector
Integrations
External REST APIs
SOAP integrations
Platform Events
Named Credentials
Salesforce-to-Salesforce
Productivity Tips
Use VS Code shortcuts
Automate deployments with SFDX
Create reusable utility classes
Follow naming conventions
Use logs for debugging
Challenges
Build Lead auto-assignment trigger
Create REST API
Write batch job to process contacts
Integrate with external API
Build managed package logic
Frequently Asked Questions about Apex
What is Apex?
Apex is a strongly typed, object-oriented programming language developed by Salesforce for building scalable, secure, and automated applications on the Salesforce platform. It allows developers to execute business logic on the server side, integrate external systems, and customize CRM workflows using a syntax similar to Java.
What are the primary use cases for Apex?
Salesforce triggers & automation. Custom REST & SOAP APIs. Batch & scheduled jobs. Complex CRM business logic. Integrations with external systems. Custom Salesforce Apps & packages
What are the strengths of Apex?
Native integration with Salesforce objects. Secure, scalable execution. Excellent tooling and test framework. Great for enterprise automation. Powerful asynchronous capabilities
What are the limitations of Apex?
Vendor lock-in to Salesforce ecosystem. Strict governor limits. Cannot interact with system file I/O. Restricted multithreading. Must follow Salesforce deployment rules
How can I practice Apex typing speed?
CodeSpeedTest offers 10+ real Apex code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.