Code Explainers

Go code explainers

go 
package storage
 
import (
	"bufio"

Streaming file downloads safely in Go

http streaming path-traversal
Intermediate 7 steps
go 
package webhooks
 
import (
	"crypto/hmac"

Verifying GitHub webhooks in Gin

hmac webhooks middleware
Intermediate 6 steps
go 
package middleware
 
import (
	"errors"

Centralized error handling in Gin

middleware error-handling custom-errors
Intermediate 8 steps
go 
package debounce
 
import (
	"sync"

Building a debouncer in Go

concurrency debounce timers
Intermediate 6 steps
go 
package retry
 
import (
	"context"

Retry with exponential backoff in Go

retry exponential-backoff jitter
Intermediate 8 steps
go 
package main
 
import (
	"bufio"

Counting matching lines in Go with bufio

file-io buffered-scanning error-handling
Intermediate 4 steps
go 
package collection
 
func Deduplicate[T comparable](items []T) []T {
	seen := make(map[T]struct{}, len(items))

Generic deduplication in Go

generics deduplication maps
Intermediate 5 steps
go 
func StreamMetrics(c *gin.Context) {
	clientGone := c.Request.Context().Done()
	ticker := time.NewTicker(time.Second)
	defer ticker.Stop()

Streaming server-sent events in Gin

server-sent-events streaming channels
Intermediate 7 steps
go 
package worker
 
import (
	"fmt"

A graceful worker pool in Go

concurrency goroutines channels
Intermediate 7 steps
go 
package handlers
 
import (
	"net/http"

Rendering HTML pages with Gin handlers

http-handlers templating error-handling
Beginner 8 steps
go 
package calc
 
import "testing"
 

Table-driven tests in Go

table-driven-tests error-handling subtests
Intermediate 7 steps
go 
package middleware
 
import (
	"net/http"

Building a bearer-token auth middleware in Gin

middleware authentication closures
Intermediate 5 steps
go 
package handlers
 
import (
	"net/http"

Reading path parameters in Gin

routing path-parameters wildcards
Beginner 7 steps
go 
package main
 
import "fmt"
 

How Go slices grow and share memory

slices memory append
Intermediate 7 steps
go 
package main
 
import "sync"
 

Mutex vs RWMutex in Go

concurrency mutex synchronization
Intermediate 6 steps
go 
package geometry
 
import "fmt"
 

Implementing fmt.Stringer in Go

interfaces stringer composition
Beginner 5 steps