error-type-assertion

Error Type Assertion (Go Idiomatic Pattern)

What is Error Type Assertion?

• Assert the error to a specific type
• Allows accessing custom fields or methods
• Safer than string matching

Use when:

• Handling errors with structured types
• Need extra info (e.g., path, operation, code)
• Want type-specific handling

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Example in this project

• Use custom error type for a file operation
• Demonstrate type assertion