Question 1

What is the reflect package in Go?

Accepted Answer

The reflect package allows inspecting and manipulating types and values at runtime. It is used to implement generic libraries (JSON marshaling, ORM), but its direct use in application code is discouraged as it sacrifices type safety and performance.

Question 2

How to get the type of a variable with the reflect package?

Accepted Answer

The reflect.TypeOf() function returns a reflect.Type representing the dynamic type of the interface passed as argument. If the variable is nil, reflect.TypeOf() returns nil. Using .Kind() on the returned Type allows getting the type category (int, string, struct, etc.).

Question 3

What is the difference between reflect.Type and reflect.Value?

Accepted Answer

reflect.Type represents type metadata (name, kind, methods, fields) and is obtained via reflect.TypeOf(). reflect.Value represents the concrete value and allows reading or modifying it via reflect.ValueOf(). Both are complementary: Type describes 'what' and Value contains 'the data'.

Reflection

What is the reflect package in Go?

Câu trả lời

How to get the type of a variable with the reflect package?

Câu trả lời

What is the difference between reflect.Type and reflect.Value?

Câu trả lời

How to modify a variable's value via reflection?

What is a reflect.Kind?

Các chủ đề phỏng vấn Go khác

Go Basics

Go Data Structures

Go Interfaces

Error Handling

Goroutines Basics

Channels

Go Modules

HTTP Server

HTTP Client

JSON Encoding

database/sql

Context Package

Testing

Concurrency Patterns

Sync Primitives

Go Web Frameworks

REST API Design

gRPC

Memory Management

Performance Optimization

Generics

Go Design Patterns

Microservices

Security & Authentication

Docker & Containerization

Kubernetes Basics

Advanced Go

CLI Development

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