4 files changed, 22 insertions, 89 deletions

diff --git a/ds/arraylist.go b/ds/arraylist.go
index d3feef5..66490f3 100644
--- a/ds/arraylist.go
+++ b/ds/arraylist.go
@@ -5,7 +5,7 @@ import (
 	"strings"
 )
 
-type ArrayList []Elem
+type ArrayList []Integer
 
 func (a ArrayList) FirstN(n int) string {
 	var sb strings.Builder
diff --git a/ds/elem.go b/ds/elem.go
deleted file mode 100644
index 22bc9d9..0000000
--- a/ds/elem.go
+++ /dev/null
@@ -1,12 +0,0 @@
-package ds
-
-type Elem interface {
-	Equal(e Elem) bool
-	Lower(e Elem) bool
-	LowerEqual(e Elem) bool
-	Higher(e Elem) bool
-	HigherEqual(e Elem) bool
-	Compare(e Elem) int
-	CompareCB(e Elem, lowerCB, higherCB, equalsCB func())
-	Int() int
-}
diff --git a/ds/integer.go b/ds/integer.go
index e8936c8..1372624 100644
--- a/ds/integer.go
+++ b/ds/integer.go
@@ -1,22 +1,19 @@
 package ds
 
 import (
-	"fmt"
 	"math/rand"
 )
 
-type Integer struct {
-	Val int
-}
+type Integer int
 
 func RandomIntegers(length, max int) ArrayList {
 	a := make(ArrayList, length)
 	for i := 0; i < length; i++ {
 		if max > 0 {
-			a[i] = Integer{rand.Intn(max)}
+			a[i] = Integer(rand.Intn(max))
 			continue
 		}
-		a[i] = Integer{rand.Int()}
+		a[i] = Integer(rand.Int())
 	}
 	return a
 }
@@ -24,7 +21,7 @@ func RandomIntegers(length, max int) ArrayList {
 func AscendingIntegers(length int) ArrayList {
 	a := make(ArrayList, length)
 	for i := 0; i < length; i++ {
-		a[i] = Integer{i}
+		a[i] = Integer(i)
 	}
 	return a
 }
@@ -33,57 +30,47 @@ func DescendingIntegers(length int) ArrayList {
 	a := make(ArrayList, length)
 	j := length
 	for i := 0; i < length; i++ {
-		a[i] = Integer{j}
+		a[i] = Integer(j)
 		j--
 	}
 	return a
 }
 
-func (i Integer) String() string {
-	return fmt.Sprintf("%d", i.Val)
-}
-
-func (i Integer) Int() int {
-	return i.Val
-}
-
-func (i Integer) Equal(j Elem) bool {
-	return i.Val == j.Int()
+func (i Integer) Equal(j Integer) bool {
+	return i == j
 }
 
-func (i Integer) Lower(j Elem) bool {
-	return i.Val < j.Int()
+func (i Integer) Lower(j Integer) bool {
+	return i < j
 }
 
-func (i Integer) LowerEqual(j Elem) bool {
-	return i.Val <= j.Int()
+func (i Integer) LowerEqual(j Integer) bool {
+	return i <= j
 }
 
-func (i Integer) Higher(j Elem) bool {
-	return i.Val > j.Int()
+func (i Integer) Higher(j Integer) bool {
+	return i > j
 }
 
-func (i Integer) HigherEqual(j Elem) bool {
-	return i.Val >= j.Int()
+func (i Integer) HigherEqual(j Integer) bool {
+	return i >= j
 }
 
-func (i Integer) Compare(j Elem) int {
-	jVal := j.Int()
+func (i Integer) Compare(j Integer) int {
 	switch {
-	case i.Val < jVal:
+	case i < j:
 		return -1
-	case i.Val > jVal:
+	case i > j:
 		return 1
 	}
 	return 0
 }
 
-func (i Integer) CompareCB(j Elem, lowerCB, higherCB, equalsCB func()) {
-	jVal := j.Int()
+func (i Integer) CompareCB(j Integer, lowerCB, higherCB, equalsCB func()) {
 	switch {
-	case i.Val < jVal:
+	case i < j:
 		lowerCB()
-	case i.Val > jVal:
+	case i > j:
 		higherCB()
 	default:
 		equalsCB()
diff --git a/ds/integer_test.go b/ds/integer_test.go
deleted file mode 100644
index fe9cb90..0000000
--- a/ds/integer_test.go
+++ /dev/null
@@ -1,42 +0,0 @@
-package ds
-
-import "testing"
-
-func TestCompare(t *testing.T) {
-	i := Integer{1}
-	j := Integer{10}
-	res := i.Compare(j)
-	if res != -1 {
-		t.Errorf("%v must be lower than %v, but got %v", i, j, res)
-	}
-
-	res = j.Compare(i)
-	if res != 1 {
-		t.Errorf("%v must be higher than %v, but got %v", j, i, res)
-	}
-
-	i = Integer{2}
-	j = Integer{2}
-	res = i.Compare(j)
-	if res != 0 {
-		t.Errorf("%v must be equal to %v, but got %v", i, j, res)
-	}
-
-	i = Integer{23}
-	j = Integer{23}
-	if !i.HigherEqual(j) {
-		t.Errorf("Unpexpected %v.HigherEqual(%v) == false",
-		    i,j)
-	}
-
-	i = Integer{23}
-	j = Integer{42}
-	if i.HigherEqual(j) {
-		t.Errorf("Unpexpected %v.HigherEqual(%v) == true",
-		    i,j)
-	}
-	if !j.HigherEqual(i) {
-		t.Errorf("Unpexpected %v.HigherEqual(%v) == false",
-		    j,i)
-	}
-}