Advanced Go — Overview

What “advanced” means in Go

If you are coming from TypeScript you already know how to think in types, handle async flows, and compose behaviour through interfaces. The Go-101 module covered the foundations. This module covers the parts of Go that unlock production-level code quality: type-safe generic algorithms, runtime reflection for framework-grade code, disciplined testing and benchmarking idioms, deep module management, and performance profiling.

None of these topics requires exotic libraries. Everything here lives in the Go standard library or the go toolchain itself.

Module map

Lesson	What you will learn	TS parallel
Generics	Type parameters, constraint interfaces, comparable, when generics beat plain interfaces	TS generics (deeper comparison)
Reflection	reflect package, struct tags at runtime, safe reflection patterns	reflect-metadata / decorators
Table-driven tests	testing.T, subtests with t.Run, shared fixture tables	jest it.each / describe.each
Benchmarks	testing.B, go test -bench, profiling intuition	benchmark.js, console.time
Modules deep dive	Semantic versioning, go.mod/go.sum, replace, vendoring, workspaces	npm + package-lock.json + npm workspaces
pprof profiling	CPU/heap profiles, net/http/pprof, reading flame graphs	node --prof, clinic.js

The philosophy

Go’s toolchain is intentionally batteries-included. You do not reach for an external benchmark runner, a profiler plugin, or a third-party test framework. The same go test command runs unit tests, integration tests, benchmarks, and fuzz tests. This is a deliberate design choice: one workflow, one command, zero framework lock-in.

TypeScript

// TypeScript needs separate tools:
import { describe, it, expect } from 'vitest';
import Benchmark from 'benchmark';
import { Profile } from 'clinic';

Go

// Go: one command rules them all
// go test ./...         — runs tests
// go test -bench=.      — runs benchmarks
// go test -fuzz=Fuzz    — runs fuzz tests
// go tool pprof cpu.out — opens profiler

🟦 Prerequisite: Go 1.21+

All code in this module targets Go 1.21 or later. Generics landed in 1.18; the slices and maps stdlib packages in 1.21. If you are on an older version, go get golang.org/x/exp provides backports of those packages.

Check your version: go version

Which Go command runs both unit tests and benchmarks?

go run go test go bench go check

Generics were added to Go in which version?

1.14 1.16 1.18 1.21

Which package provides runtime reflection in Go?

runtime reflect unsafe meta

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