Go fix 1.26

1.go

// Until Go 1.25
age := 42
p := &age

// Go 1.26 onwards
p := new(42)

// run go fix
$go fix -newexpr ./...

// Simple workflow
go fix ./...
go test ./...
git diff

1.txt

$go version
go version go1.26.0 darwin/arm64

$go tool fix help
fix is a tool for static analysis of Go programs.

Registered analyzers:

    any          replace interface{} with any
    buildtag     check //go:build and // +build directives
    fmtappendf   replace []byte(fmt.Sprintf) with fmt.Appendf
    forvar       remove redundant re-declaration of loop variables
    hostport     check format of addresses passed to net.Dial
    inline       apply fixes based on 'go:fix inline' comment directives
    mapsloop     replace explicit loops over maps with calls to maps package
    minmax       replace if/else statements with calls to min or max
    newexpr      simplify code by using go1.26's new(expr)
    omitzero     suggest replacing omitempty with omitzero for struct fields
    plusbuild    remove obsolete //+build comments
    rangeint     replace 3-clause for loops with for-range over integers
    reflecttypefor replace reflect.TypeOf(x) with TypeFor[T]()
    slicescontains replace loops with slices.Contains or slices.ContainsFunc
    slicessort   replace sort.Slice with slices.Sort for basic types
    stditerators use iterators instead of Len/At-style APIs
    stringsbuilder replace += with strings.Builder
    stringscut   replace strings.Index etc. with strings.Cut
    stringscutprefix replace HasPrefix/TrimPrefix with CutPrefix
    stringsseq   replace ranging over Split/Fields with SplitSeq/FieldsSeq
    testingcontext replace context.WithCancel with t.Context in tests
    waitgroup    replace wg.Add(1)/go/wg.Done() with wg.Go

By default all analyzers are run.

2.txt

// ดูการเปลี่ยนแปลงก่อน
$go fix -diff ./...

// ทำการเปลี่ยนแปลง code
$go fix ./...
$GOOS=darwin  GOARCH=arm64 go fix ./...