Go Quick Reference

# Run code
go run main.go
go run .                      # Run all files in current dir

# Build binary
go build -o myapp .
go build -o myapp main.go

# Testing
go test ./...                 # All tests in all subdirs
go test -v ./...              # Verbose
go test -run TestName         # Run specific test
go test -cover ./...          # Show coverage

# Dependencies
go mod init github.com/user/project
go mod tidy                   # Clean up go.mod
go get github.com/pkg/name    # Add dependency
go get -u ./...               # Update all deps

# Code quality
go fmt ./...                  # Format all code
go vet ./...                  # Find suspicious code
staticcheck ./...             # Advanced linting

# Documentation
go doc strings                # Package docs
go doc strings.Split          # Function docs
go doc -all strings           # Everything

# Other
go install                    # Install binary to $GOPATH/bin
go clean                      # Remove build artifacts
go version                    # Show Go version

// Variables
var name string = "value"
name := "value"              // Short declaration (inside functions only)

// If statement
if x > 10 {
    // do something
}

// If with initialization
if err := doSomething(); err != nil {
    return err
}

// For loop (the only loop)
for i := 0; i < 10; i++ { }
for key, val := range myMap { }
for index, item := range mySlice { }
for { // infinite loop }

// Functions
func add(a, b int) int {
    return a + b
}

// Multiple returns
func divide(a, b float64) (float64, error) {
    if b == 0 {
        return 0, errors.New("division by zero")
    }
    return a / b, nil
}

// Error handling
result, err := doSomething()
if err != nil {
    return err
}

// Slices
nums := []int{1, 2, 3}
nums = append(nums, 4)

// Maps
ages := map[string]int{
    "alice": 30,
    "bob":   25,
}

// Check if key exists
age, ok := ages["charlie"]
if ok {
    fmt.Println(age)
}

// Structs
type Person struct {
    Name string
    Age  int
}

p := Person{Name: "Alice", Age: 30}

// Pointers
x := 5
ptr := &x              // Get address
val := *ptr            // Dereference

go install golang.org/x/tools/gopls@latest

[[language]]
name = "go"
auto-format = true
formatter = { command = "goimports" }

[language-server.gopls]
command = "gopls"
config = { "gofumpt" = true }

# Better imports (includes gofmt)
go install golang.org/x/tools/cmd/goimports@latest

# Advanced linter
go install honnef.co/go/tools/cmd/staticcheck@latest

# Stricter formatting (optional)
go install mvdan.cc/gofumpt@latest