Go study guide

100+ coding interview problems with detailed solutions, test cases, and program analysis →

Motivation

This repo contains notes on learning Go and computer systems. Different people have different learning style. On my case, learn best by doing and walking through examples. Dumping take notes carefully and comment directly on the source code, rather than writing up Markdown files. That way, you should understand every single line of code as you are reading and also be mindful of the theories behind the scene.

In the mix, it includes links to other articles that you could find helpful.

Table of Contents

• Design Philosophy: Guideline
• Language Mechanics
  • Syntax
    • Variable: Built-in types | Zero value concept | Initialization | Conversion vs Casting
    • Struct: Initialization | Name type vs Anonymous type
    • Pointer:
      • Passing by value | Escape analysis | Stack space | Garbage Collection
      • Golang's Code Review Receiver Type
    • Constant: Initialization | iota
    • Function: Initialization
  • Data Structures
    • Array: CPU Cache | TLB | Initialization | Iteration | Type array | Contiguous memory allocation
    • Slice: Initialization | Length vs Capacity | Reference Type | Appending | Slice of Slice | Copy of Slice | UTF-8
    • Map: Initialization | Iteration | Deleting | Finding | Restriction
  • Decoupling
    • Method:
      • Value and Pointer Receiver Call
      • Value and Pointer Semantics
      • Methods are just functions | Function variable
    • Interface:
      • Valueless type | Concrete type vs Interface type | Relationship | Polymorphic function
      • Interface via Pointer Receiver | Method set | Slice of Interface
    • Embedding:
      • Declaring fields, NOT Embedding
      • Embedding type | Inner type promotion
      • Embedded type and Interface
      • Outer and inner type implementing the same Interface
    • Exporting:
      • Guideline
      • Exported identifier
      • Accessing a value of an unexported identifier
      • Unexported fields from an exported struct
      • Exported types with embedded unexported types
• Software Design
  • Composition: Guideline
    • Grouping types:
      • Grouping By State
      • Grouping By Behavior
    • Decoupling:
      • Struct Composition
      • Decoupling With Interface
      • Interface Composition
      • Decoupling With Interface Composition
    • Conversion:
      • Interface Conversions | Type Assertion
      • Runtime Type Assertion
    • Interface Pollution:
      • Interface Pollution
      • Remove Interface Pollution
    • Mocking:
      • Package To Mock
      • Sample Client
  • Error Handling:
    • Default error values
    • Error variables
    • Type as context
    • Behavior as context
    • Finding the bug/pitfall of nil value of error interface
    • Wrapping Errors
  • Packaging: Guideline
• Concurrency
  • Mechanics
    • Goroutine:
      • Go Scheduler Internals
      • Language Mechanics
      • Goroutine time slicing
      • Goroutines and parallelism
    • Data race:
      • Race Detection
      • Atomic Functions
      • Mutexes
      • Read/Write Mutex
    • Channel:
      • Guideline
      • Language Mechanics | Unbuffered channel: Signaling with(out) data
      • Unbuffered channel: Double signal | Buffered channel: Close and range | Unbuffered channel: select and receive | Unbuffered channel: select and send | Buffered channel: Select and drop
      • Unbuffered channel (Tennis match)
      • Unbuffered channel (Replay race)
      • Buffered channel: Fan Out
      • Select
  • Patterns
    • Context:
      • Store and retrieve values from a context
      • WithCancel
      • WithDeadline
      • WithTimeout
      • Request/Response
    • Pattern
      • Task
      • Logger
• Testing and Profiling
  • Testing:
    • Basic Unit Test
    • Table Test
    • Sub Test
    • Web Server
    • Mock Server
    • Test Coverage
  • Benchmarking
    • Basic Benchmark
    • Sub Benchmark
  • Fuzzing
    • Guideline
  • Profiling
    • Stack Trace: Review | Packing
    • GODEBUG: Memory Tracing
• Packages
  • Context
  • Encoding
  • IO
  • Logging
  • Reflection

References

• Ultimate Go Programming
• ardanlabs/gotraining/topics/courses/go
• Computer Systems: A Programmer's Perspective
• Free Gophers Pack