Programming Tutorials and Coding Guides - Page 12

Build a map from a slice in Go: use elements as keys for set-like maps, pick struct fields as keys, map indices to values, or map keys to slices of positions for duplicates.

Convert int to string in Go with strconv.Itoa or strconv.FormatInt, fmt.Sprintf or fmt.Fprintf to an io.Writer, and strings.Builder for custom assembly; compare with general type conversion in Go.

Use golang context for deadlines and cancellation: Background and TODO roots, WithCancel, WithTimeout, WithDeadline, and WithValue for request-scoped data; always call cancel and pass ctx as the first parameter.

Golang map and maps in golang: map[K]V, golang map literal and make, nil map panic, comma-ok lookup, delete and range, ordered iteration via sorted keys, golang global map and concurrency, dictionary analogy to Python.

Experimental desktop GUIs with golang.org/x/exp/shiny: driver.Main, screen buffers, paint and lifecycle events from x/mobile, resize-safe drawing, and when to prefer Fyne, Gio, Ebiten, or Wails.

Cooperative goroutine shutdown in Go: no kill API, done channels, context cancel and timeouts, worker drains, pipeline-style leaks, WaitGroup, defer cleanup, and cheat sheet vs force kill.

strings.Split and SplitN, Fields for whitespace, Cut for the first separator, cleaning empty tokens and TrimSpace, CSV caveats with encoding/csv, Split vs regexp.Split, and common mistakes.

Go has no f-strings or ${} interpolation; use fmt.Sprintf and format verbs, Printf vs Sprintf vs Sprint, number padding and bases, struct verbs, Builder and text/template alternatives, and common fmt mistakes.

Golang logrus and go logrus: install github.com/sirupsen/logrus, logrus log levels with SetLevel, TextFormatter and JSONFormatter, io.MultiWriter, SetReportCaller, hooks, and how long go.sum lines relate to the module …

Golang log to file with os.OpenFile and log.SetOutput; golang log to file and stdout using io.MultiWriter; golang log syslog on Linux; go import log and golang log example; concurrency-safe default log.Logger.

Golang function parameter multiple types: use any/interface{} with a type switch, golang function types with type parameters (generics), go function types and golang func type constraints, plus golang pass type as …

Call Go code from another file or another package: what to import, when you do not need an import, capital letters for public functions, and how to fix typical errors.

go list command for std, ./..., and all; go list -m all for modules; where Go stores packages (GOMODCACHE, GOROOT, GOPATH/bin); list go packages and binaries from go install without mistaking modules for a global package …

Learn anonymous functions in Go: function literals, immediate calls, parameters and return values, variables, callbacks, closures, goroutines, and common mistakes like loop capture.

Golang os exit defer: os.Exit golang behavior matches pkg.go.dev os Exit — program terminates immediately and deferred functions are not run; patterns to run cleanup before exit, go os.exit deferred functions official …

Golang reverse range and golang range reverse with a backward index loop; golang range backwards using forward range and remapped index; golang iterate over slice and golang iterate slice backwards; golang reverse slice …

Golang split string and golang string split with strings.Split and strings.Fields; strings split golang and go split string; golang split string into two variables with strings.Cut or slice indexing; net.SplitHostPort …

Golang set cookie with http.SetCookie and http.Cookie, golang http cookie headers, golang cookies and cookie golang reads via Request.Cookie, Path Domain MaxAge Expires SameSite Secure HttpOnly, order before Write, curl …

Golang iterate over array and golang array loop with for range; golang for loop array and golang loop through array using len; go iterate over array and iterate over array golang with index or values only.

Convert go bytes to string with string(b), fmt.Sprintf, strings.Builder or bytes.Buffer, strconv for numbers, and know when copying happens for UTF-8 text and binary data.

Connect a Go program to Redis with github.com/redis/go-redis/v9, Ping with context, Set and Get strings, and store hashes; run Redis locally and match password and DB settings.

Convert time.Time to Unix milliseconds with UnixMilli, derive ms from UnixNano, or use Duration.Milliseconds after Sub; know int64 range limits from the time package docs.

Golang grpc example and grpc golang tutorial: proto3 service, golang grpc server and grpc server golang with Register and Serve, go grpc client and go grpc example with grpc.NewClient and transport credentials, grpc go …

Golang int and go int types, golang int types and sizes, golang int vs int32, uint and sized integers, byte and rune aliases, and how golang data types size depends on int versus int8–int64.

Golang CPU affinity on Linux: cpu masking with golang.org/x/sys/unix SchedSetaffinity, taskset from Go, runtime.LockOSThread for set thread affinity, and why gomaxprocs golang is not affinity.

FlashDB golang tutorial: an in memory database golang option and golang key value store with Redis-style types. Covers go in memory database setup, transactions, string SET/GET/DELETE, disk vs pure memory, and links for …

Golang check if nil for pointers and maps; golang null pointer with == nil; check if slice is empty golang (len vs nil); golang check if struct is empty (not nil—reflect.IsZero); golang check if interface is nil …

Use tls.Config InsecureSkipVerify on a dedicated net/http Transport for golang http client skip tls verify only in dev; prefer fixing golang ssl certificate trust with RootCAs instead of golang disable ssl verification …

Golang flag and golang flags examples using the standard library flag package: go flag and go CLI flags, golang flag example for string, int, and bool, golang flag multiple values with flag.Value, required flags, …

Golang file seek and go file seek with (*os.File).Seek: io.SeekStart, io.SeekCurrent, io.SeekEnd, temp-file examples, and bytes.Reader for in-memory golang seek.