Dokumentasi Go (Golang)

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Go Errgroup Sync Parallel Goroutines Error Limit Context Cancel

Panduan Go errgroup: jalankan N goroutine paralel, satu error cancel ctx, wait return err, dan jebakan loop var capture + tulis slice tanpa index/mutex.

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Go Structs Interfaces Pointers Methods

Panduan Go untuk struct, interface, pointer, dan method, termasuk pointer vs value receiver, method set, zero value, dan decoupling via interface.

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Go Error Handling Packages Testing Project Structure

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Go Error Handling Return Error Wrapping Sentinel Errors

Panduan Go error handling: return error value, if err != nil, wrap %w, sentinel errors.Is, dan jebakan lupa cek err + %v bukan %w + panic untuk error bisnis.

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Go Interface Type Implisit Empty Assertion

Panduan Go interface: implementasi implisit, any/interface{}, type assertion, dan jebakan assertion tanpa ok + nil interface vs nil pointer + interface terlalu besar.

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Go Memulai Instalasi Hello World Workspace Gopath

Panduan Go memulai: instalasi, hello world, go mod init, struktur workspace modules vs GOPATH, dan jebakan lupa init + package bukan main + tidak go fmt.

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Go Package Deklarasi Import Init Internal

Panduan Go package: deklarasi folder=package, init() otomatis, internal/ terisolasi, dan jebakan circular import + impor internal dari luar + side-effect import.

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Go Workspace Multi Module Gowork Replace Shared Packages Local Dev

Panduan Go workspace go.work: multi-module dev lokal tanpa proxy, replace path, dan jebakan commit go.work ke release + lupa replace saat tanpa workspace.

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Go Config Viper Env File Watch Flag Override

Panduan Go config Viper: baca file/env/flag, prioritas override, WatchConfig fsnotify untuk reload, dan jebakan Get sebelum ReadInConfig + watch tanpa guard race.

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Go Struktur Program Package Main Func Import Statements

Panduan struktur program Go: package, import, func main, := short declaration, dan jebakan import tak terpakai + variabel tak dipakai + huruf kecil saat export.

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Go Testing Testify Assert Require Suite Mock Structs

Panduan testing Go dengan testify: assert vs require, suite SetupTest/TearDown, mock, dan jebakan require di loop tanpa subtest + state suite bocor.

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Go Web API Lanjut Validasi Error Response Versioning

Panduan Go Web API lanjut: error response seragam, validasi struct, versioning path, status code tepat, dan jebakan bocorkan stack di error.

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Go Grpc Proto Server Client Basic Unary Streaming

Panduan gRPC Go: definisi proto, generate stub, unary server/client, TLS, dan jebakan ubah field number + tanpa TLS produksi.

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Go HTTP Server Routing Middleware JSON API

Panduan praktis net/http di Go untuk HTTP server, routing dasar, middleware pattern, parsing JSON request/response, dan jebakan umum saat membangun API kecil.

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Go JSON Encoding Decoding Validation Time Handling

Panduan praktis Go untuk encoding/json, struct tags, omitempty, RawMessage, validasi payload, dan handling time format serta timezone.

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Go Modules Packages Workspaces Dependency Management

Panduan referensi Go untuk package, module, workspace, `go.mod`, `go.sum`, versioning dependency, dan jebakan import path.

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Go Testing Httptest Subtests Benchmarks Mocks Fakes

Panduan referensi Go untuk testing, table-driven tests, testing.T, subtests, httptest, mocks/fakes sederhana, benchmark dasar, dan jebakan test rapuh.

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Go Context Cancellation Deadlines Timeouts Usage Patterns

Panduan praktis context di Go untuk cancellation, deadlines, timeouts, propagasi context di HTTP/server/worker flow, dan jebakan umum seperti menyimpan context di struct atau lupa cancel.

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Go Error Handling Wrapping Sentinel Custom Panic Recover

Panduan error handling Go untuk sentinel error, custom error, wrapping dengan %w, errors.Is/As, panic/recover, dan jebakan umum seperti error shadowing dan kehilangan konteks.

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Go CLI Commands Flags Argument Parsing

Panduan praktis CLI di Go dengan flag package, subcommand pattern, positional args, alur parse→validate→run, dan jebakan umum saat parsing input baris perintah.

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Go Generics Type Parameters Constraints Custom Interface

Panduan Go generics untuk type parameters, constraint any/comparable/custom interface, generic function/type, dan jebakan saat over-abstracting.

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Go IO Fs Embed File Embedding Fs Interface

Panduan Go embed.FS dan io/fs untuk menyematkan aset ke binary, abstraction fs.FS, serta testing dengan fstest.MapFS tanpa menyentuh disk.

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Go Sync Waitgroup Mutex Once Atomic Concurrency Primitives

Panduan Go sync package untuk WaitGroup, Mutex/RWMutex, Once, atomic, dan jebakan race, copy mutex, serta hold lock terlalu lama.

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Go Net HTTP Middleware Chain Logging Auth Recover

Panduan Go net/http middleware chain: pola func(next Handler) Handler, urutan chain mundur, context antar middleware, dan jebakan next dipanggil dua kali atau lupa.

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Go Database SQL Connection Pool Query Scan Prepare

Panduan Go database/sql: sql.Open + Ping, Query/QueryRow + Scan, Prepare, transaksi, pool setting, dan jebakan rows.Close serta lupa rows.Err.

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Go Testing Iotest Table Tests Fuzz Subtests

Panduan testing Go: table tests + t.Run subtest, fuzz dengan corpus, testing/iotest (OneByteReader, TimeoutReader), dan jebakan loop variable capture serta t.Fatal vs Error.

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Concurrency

Go Errgroup Sync Parallel Goroutines Error Limit Context Cancel

Dasar-Dasar

Go Structs Interfaces Pointers Methods

Go Error Handling Packages Testing Project Structure

Error Handling

Go Error Handling Return Error Wrapping Sentinel Errors

Interface

Go Interface Type Implisit Empty Assertion

Memulai

Go Memulai Instalasi Hello World Workspace Gopath

Package

Go Package Deklarasi Import Init Internal

Project Structure

Go Workspace Multi Module Gowork Replace Shared Packages Local Dev

Go Config Viper Env File Watch Flag Override

Struktur Program

Go Struktur Program Package Main Func Import Statements

Testing

Go Testing Testify Assert Require Suite Mock Structs

Web API

Go Web API Lanjut Validasi Error Response Versioning

Go Grpc Proto Server Client Basic Unary Streaming

Go Concurrency Goroutines Channels Select Context Cancellation

Go HTTP Server Routing Middleware JSON API

Go JSON Encoding Decoding Validation Time Handling

Go Modules Packages Workspaces Dependency Management

Go Testing Httptest Subtests Benchmarks Mocks Fakes

Go Context Cancellation Deadlines Timeouts Usage Patterns

Go Error Handling Wrapping Sentinel Custom Panic Recover

Go CLI Commands Flags Argument Parsing

Go Generics Type Parameters Constraints Custom Interface

Go IO Fs Embed File Embedding Fs Interface

Go Sync Waitgroup Mutex Once Atomic Concurrency Primitives

Go Net HTTP Middleware Chain Logging Auth Recover

Go Database SQL Connection Pool Query Scan Prepare

Go Testing Iotest Table Tests Fuzz Subtests

Go Modules Versioning Replace Semantic Import Major Version

Go Profiling Observability Pprof Expvar Trace Runtime Metrics