refactor: migrate to Go 1.22 slices/cmp, update linters

Replace usage of golang.org/x/exp/constraints with Go 1.22 cmp/slices.
Update .golangci.yml to new v2 format and enable gofmt/goimports.
Refactor imports and type constraints across codebase for consistency.

.golangci.yml

@@ -1,42 +1,54 @@
-skip-dirs-use-default: true
-
-run:
-  timeout: 5m
-
+version: "2"
 linters:
   enable:
     - bodyclose
-    - deadcode
     - depguard
     - dogsled
-    - errcheck
     - errorlint
-    - exportloopref
     - gocritic
     - gocyclo
-    - gofmt
-    - goimports
     - goprintffuncname
-    - gosimple
     - gosec
-    - govet
-    - ineffassign
     - misspell
     - noctx
     - nolintlint
     - prealloc
     - rowserrcheck
     - staticcheck
-    - structcheck
-    - stylecheck
-    - typecheck
     - unconvert
     - unparam
-    - unused
-    - varcheck
     - whitespace
-  fast: true
-
-linters-settings:
-  goimports:
-    local-prefixes: github.com/rjNemo/underscore
+  exclusions:
+    generated: lax
+    presets:
+      - comments
+      - common-false-positives
+      - legacy
+      - std-error-handling
+    paths:
+      - third_party$
+      - builtin$
+      - examples$
+  settings:
+    depguard:
+      rules:
+        main:
+          list-mode: lax
+          files:
+            - $all
+          allow:
+            - $gostd
+            - github.com/rjNemo/underscore
+            - github.com/rjNemo/underscore/...
+            - github.com/stretchr/testify/...
+            - golang.org/x/exp/constraints
+formatters:
+  enable:
+    - gofmt
+    - goimports
+  exclusions:
+    generated: lax
+    paths:
+      - third_party$
+      - builtin$
+      - examples$

any.go

@@ -1,12 +1,9 @@
 package underscore
 
+import "slices"
+
 // Any returns true if any of the values in the slice pass the predicate truth test.
 // Short-circuits and stops traversing the slice if a true element is found.
 func Any[T any](values []T, predicate func(T) bool) bool {
-	for _, v := range values {
-		if predicate(v) {
-			return true
-		}
-	}
-	return false
+	return slices.ContainsFunc(values, predicate)
 }

drop_test.go

@@ -9,7 +9,6 @@ import (
 )
 
 func TestDrop(t *testing.T) {
-
 	nums := []int{1, 9, 2, 8, 3, 7, 4, 6, 5}
 	want := []int{1, 9, 2, 3, 7, 4, 6, 5}
 

find_test.go

@@ -3,8 +3,9 @@ package underscore_test
 import (
 	"testing"
 
-	u "github.com/rjNemo/underscore"
 	"github.com/stretchr/testify/assert"
+
+	u "github.com/rjNemo/underscore"
 )
 
 func TestFind(t *testing.T) {

flatmap_test.go

@@ -3,8 +3,9 @@ package underscore_test
 import (
 	"testing"
 
-	u "github.com/rjNemo/underscore"
 	"github.com/stretchr/testify/assert"
+
+	u "github.com/rjNemo/underscore"
 )
 
 func TestFlatmap(t *testing.T) {

intersection_test.go

@@ -3,9 +3,9 @@ package underscore_test
 import (
 	"testing"
 
-	u "github.com/rjNemo/underscore"
-
 	"github.com/stretchr/testify/assert"
+
+	u "github.com/rjNemo/underscore"
 )
 
 func TestIntersection(t *testing.T) {

join.go

@@ -6,12 +6,12 @@ func Join[T, P any, S comparable](
 	left []T,
 	right []P,
 	leftSelector func(T) S,
-	rightSelector func(P) S) []Tuple[T, []P] {
-
-	var results = make([]Tuple[T, []P], 0, len(left))
+	rightSelector func(P) S,
+) []Tuple[T, []P] {
+	results := make([]Tuple[T, []P], 0, len(left))
 	for _, l := range left {
-		var matches = Filter(right, func(r P) bool { return leftSelector(l) == rightSelector(r) })
-		var tuple = Tuple[T, []P]{Left: l, Right: matches}
+		matches := Filter(right, func(r P) bool { return leftSelector(l) == rightSelector(r) })
+		tuple := Tuple[T, []P]{Left: l, Right: matches}
 		results = append(results, tuple)
 	}
 
@@ -28,8 +28,8 @@ func JoinProject[L, R, O any, S comparable](
 	right []R,
 	leftSelector func(L) S,
 	rightSelector func(R) S,
-	projection func(Tuple[L, []R]) O) (results []O) {
-
+	projection func(Tuple[L, []R]) O,
+) (results []O) {
 	for _, x := range Join(left, right, leftSelector, rightSelector) {
 		results = append(results, projection(x))
 	}

join_test.go

@@ -3,23 +3,26 @@ package underscore_test
 import (
 	"testing"
 
-	u "github.com/rjNemo/underscore"
 	"github.com/stretchr/testify/assert"
+
+	u "github.com/rjNemo/underscore"
 )
 
-var zero = u.Tuple[int, string]{Left: 0, Right: "Zero"}
-var one = u.Tuple[int, string]{Left: 1, Right: "One"}
-var two = u.Tuple[int, string]{Left: 2, Right: "Two"}
-var three = u.Tuple[int, string]{Left: 3, Right: "Three"}
+var (
+	zero  = u.Tuple[int, string]{Left: 0, Right: "Zero"}
+	one   = u.Tuple[int, string]{Left: 1, Right: "One"}
+	two   = u.Tuple[int, string]{Left: 2, Right: "Two"}
+	three = u.Tuple[int, string]{Left: 3, Right: "Three"}
+)
 
 func Test_Join_Can_Join_Two_Slices_Together(t *testing.T) {
-	var left = []u.Tuple[int, string]{zero, one, two, three}
-	var right = []u.Tuple[int, string]{one, three, two, three, two, three}
+	left := []u.Tuple[int, string]{zero, one, two, three}
+	right := []u.Tuple[int, string]{one, three, two, three, two, three}
 
 	selector := func(x u.Tuple[int, string]) int { return x.Left }
 
-	var joined = u.Join(left, right, selector, selector)
-	var want = []u.Tuple[u.Tuple[int, string], []u.Tuple[int, string]]{
+	joined := u.Join(left, right, selector, selector)
+	want := []u.Tuple[u.Tuple[int, string], []u.Tuple[int, string]]{
 		{Left: zero, Right: nil},
 		{Left: one, Right: []u.Tuple[int, string]{one}},
 		{Left: two, Right: []u.Tuple[int, string]{two, two}},
@@ -30,16 +33,16 @@ func Test_Join_Can_Join_Two_Slices_Together(t *testing.T) {
 }
 
 func Test_Join_Can_Join_and_Project_Two_Slices_Together(t *testing.T) {
-	var left = []u.Tuple[int, string]{zero, one, two, three}
-	var right = []u.Tuple[int, string]{one, three, two, three, two, three}
+	left := []u.Tuple[int, string]{zero, one, two, three}
+	right := []u.Tuple[int, string]{one, three, two, three, two, three}
 
 	selector := func(x u.Tuple[int, string]) int { return x.Left }
 	project := func(x u.Tuple[u.Tuple[int, string], []u.Tuple[int, string]]) int {
 		return len(x.Right) // projecting to a could of how many
 	}
 
-	var joined = u.JoinProject(left, right, selector, selector, project)
-	var want = []int{0, 1, 2, 3}
+	joined := u.JoinProject(left, right, selector, selector, project)
+	want := []int{0, 1, 2, 3}
 
 	assert.Equal(t, want, joined)
 }

max.go

@@ -1,11 +1,11 @@
 package underscore
 
-import "golang.org/x/exp/constraints"
+import "cmp"
 
 // Max returns the maximum value in the slice.
 // This function can currently only compare numbers reliably.
 // This function uses operator <.
-func Max[T constraints.Ordered](values []T) T {
+func Max[T cmp.Ordered](values []T) T {
 	max := values[0]
 	for _, v := range values {
 		if v > max {

min.go

@@ -1,11 +1,11 @@
 package underscore
 
-import "golang.org/x/exp/constraints"
+import "cmp"
 
 // Min returns the minimum value in the slice.
 // This function can currently only compare numbers reliably.
 // This function uses operator <.
-func Min[T constraints.Ordered](values []T) T {
+func Min[T cmp.Ordered](values []T) T {
 	min := values[0]
 	for _, v := range values {
 		if v < min {

pipe.go

@@ -1,10 +1,10 @@
 package underscore
 
 import (
-	"golang.org/x/exp/constraints"
+	"cmp"
 )
 
-type Pipe[T constraints.Ordered] struct {
+type Pipe[T cmp.Ordered] struct {
 	Value []T
 }
 
@@ -12,7 +12,7 @@ type Pipe[T constraints.Ordered] struct {
 // call Value to retrieve the final value.
 //
 // Methods not returning a slice such as Reduce, All, Any, will break the Pipe and return Value instantly.
-func NewPipe[T constraints.Ordered](value []T) Pipe[T] {
+func NewPipe[T cmp.Ordered](value []T) Pipe[T] {
 	return Pipe[T]{Value: value}
 }
 

slices.go

@@ -1,20 +1,19 @@
 package underscore
 
 import (
+	"cmp"
 	"sort"
-
-	"golang.org/x/exp/constraints"
 )
 
 // SortSliceASC sorts any slice ASCENDING
-func SortSliceASC[T constraints.Ordered](s []T) {
+func SortSliceASC[T cmp.Ordered](s []T) {
 	sort.SliceStable(s, func(i, j int) bool {
 		return s[i] < s[j]
 	})
 }
 
 // SortSliceDESC sorts any slice DESCENDING
-func SortSliceDESC[T constraints.Ordered](s []T) {
+func SortSliceDESC[T cmp.Ordered](s []T) {
 	sort.SliceStable(s, func(i, j int) bool {
 		return s[i] > s[j]
 	})

sum.go

@@ -1,9 +1,11 @@
 package underscore
 
-import "golang.org/x/exp/constraints"
+import (
+	"cmp"
+)
 
 // Sum adds elements of the slice.
-func Sum[T constraints.Ordered](values []T) (sum T) {
+func Sum[T cmp.Ordered](values []T) (sum T) {
 	for _, v := range values {
 		sum += v
 	}
@@ -12,7 +14,7 @@ func Sum[T constraints.Ordered](values []T) (sum T) {
 
 // SumMap sums the values you select from your struct, basically a sort cut instead of
 // having to perform a [Map] followed by a [Sum].
-func SumMap[T any, R constraints.Ordered](list []T, selector func(T) R) (sum R) {
+func SumMap[T any, R cmp.Ordered](list []T, selector func(T) R) (sum R) {
 	for _, v := range list {
 		sum += selector(v)
 	}