diff --git a/go.mod b/go.mod
index 1762160..90a9c15 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module github.com/surdeus/godat
+module github.com/mojosa-software/godat
 
 go 1.19
 
diff --git a/src/cmd/sparse/main.go b/src/cmd/sparse/main.go
index 34a61d4..e6ca2c2 100644
--- a/src/cmd/sparse/main.go
+++ b/src/cmd/sparse/main.go
@@ -1,7 +1,7 @@
 package main
 
 import (
-	"github.com/surdeus/godat/src/sparsex"
+	"github.com/mojosa-software/godat/src/sparsex"
 	"fmt"
 )
 
diff --git a/src/cmd/test/main.go b/src/cmd/test/main.go
index 4a6a2af..aa46234 100644
--- a/src/cmd/test/main.go
+++ b/src/cmd/test/main.go
@@ -1,9 +1,10 @@
 package main
 
 import (
-	"github.com/surdeus/godat/src/mapx"
-	"github.com/surdeus/godat/src/slicex"
-	"github.com/surdeus/godat/src/poolx"
+	//"github.com/mojosa-software/godat/src/mapx"
+	//"github.com/mojosa-software/godat/src/slicex"
+	//"github.com/mojosa-software/godat/src/poolx"
+	"github.com/mojosa-software/godat/src/rangex"
 	"fmt"
 )
 
@@ -13,7 +14,13 @@ type Struct struct {
 }
 
 func main() {
-	m := map[string] string {
+	rangex.New[float32](0, .001, 1).Chan().ForEach(
+		func(i int, v float32) bool {
+			fmt.Println(i, v)
+			return true
+		},
+	)
+	/*m := map[string] string {
 		"Key1" : "Value1",
 		"Key2" : "Value2",
 		"Key3" : "Value3",
@@ -49,5 +56,5 @@ func main() {
 	ll.Del(1)
 	for p := range ll.Range() {
 		fmt.Println(p)
-	}
+	}*/
 }
diff --git a/src/iterx/iter.go b/src/iterx/iter.go
new file mode 100644
index 0000000..22acec7
--- /dev/null
+++ b/src/iterx/iter.go
@@ -0,0 +1,20 @@
+package iterx
+
+// Implementing the interface lets us iterate through the
+// the data by lightweight channels.
+type Channeler[K any, V any] interface {
+	Chan() PairChan[K, V]
+}
+
+// Implementing the interface provides the way to
+// convert the type to slice.
+type Slicer[V any] interface {
+	Slice() []V
+}
+
+// Implementing the interface provides us the way to 
+// convert the type to map.
+type Mapper[K comparable, V any] interface {
+	Map() map[K] V
+}
+
diff --git a/src/iterx/pair.go b/src/iterx/pair.go
new file mode 100644
index 0000000..679d31f
--- /dev/null
+++ b/src/iterx/pair.go
@@ -0,0 +1,27 @@
+package iterx
+
+// The type describes pair of key and value.
+type Pair[K any, V any] struct {
+	V V
+	K K
+}
+
+// The type describes channel of pairs.
+type PairChan[K any, V any] chan Pair[K, V]
+
+// Slice of pairs.
+type Pairs[K any, V any] []Pair[K, V]
+
+// ForEach for channels, like in JS.
+// Be careful since the function does not close the
+// channel so if fn breaks the loop then there can
+// be values left.
+func (pc PairChan[K, V]) ForEach(fn func(k K, v V) bool) {
+	for p := range pc {
+		if !fn(p.K, p.V) {
+			break
+		}
+	}
+}
+
+
diff --git a/src/mapx/main.go b/src/mapx/main.go
index 52baf48..1a9f607 100644
--- a/src/mapx/main.go
+++ b/src/mapx/main.go
@@ -1,39 +1,7 @@
 package mapx
 
-// The type implements map type where
-// you can get, set and delete by value
-// since it store everything as ONLY entity
-// both for keys and values way.
-// Use only when you do not care about the order.
-type UniqMap[K, V comparable] struct {
-	store map[K] V
-	rstore map[V] K
-}
-
-// Returns new empty UniqMap.
-func NewUniq[K, V comparable]() *UniqMap[K, V] {
-	return &UniqMap[K, V]{
-		make(map[K] V),
-		make(map[V] K),
-	}
-}
-
-// Sets new value v for the k key.
-func (m *UniqMap[K, V]) Set(k K, v V) {
-	m.store[k] = v
-	m.rstore[v] = k
-}
-
-// Get value by the k key.
-func (m *UniqMap[K, V]) Get(k K) (V, bool) {
-	v, ok := m.store[k]
-	return v, ok
-}
-
-func (m *UniqMap[K, V]) GetByValue(v V) (K, bool) {
-	k, ok := m.rstore[v]
-	return k, ok
-}
+// The package implements some more specific
+// map structures for special uses.
 
 func Keys[K comparable, V any](m map[K] V) []K {
 	r := make([]K, 0, len(m))
diff --git a/src/mapx/ordered.go b/src/mapx/ordered.go
new file mode 100644
index 0000000..86e9e8e
--- /dev/null
+++ b/src/mapx/ordered.go
@@ -0,0 +1,36 @@
+package mapx
+
+// The type makes the underlying map ordered,
+// so every time you pass through all the values
+// they will be in the same order.
+type OrderedMap[K comparable, V any] struct {
+	store map[K] V
+	keys []K
+}
+
+// Returns the new empty ordered map.
+func NewOrdered[K comparable, V any]() *OrderedMap[K, V] {
+	return &OrderedMap[K, V]{
+		store: make(map[K] V),
+	}
+}
+
+// Set or reset the value in the map.
+func (m *OrderedMap[K, V]) Set(k K, v V) {
+	_, ok := m.store[k]
+	if !ok {
+		keys = append(keys, k)
+	}
+	
+	m.store[k] = v
+}
+
+// Get the value from the map.
+func (m *OrderedMap[K, V]) Get(k K) (V, bool) {
+	v, ok := m.store[k]
+	return v, ok
+}
+
+// Return channel of pairs.
+func (m *OrderedMap[K, V]) Range() chan Pair
+
diff --git a/src/mapx/uniq.go b/src/mapx/uniq.go
new file mode 100644
index 0000000..a643e26
--- /dev/null
+++ b/src/mapx/uniq.go
@@ -0,0 +1,37 @@
+package mapx
+
+// The type implements map type where
+// you can get, set and delete by value
+// since it store everything as ONLY entity
+// both for keys and values way.
+// Use only when you do not care about the order.
+type UniqMap[K, V comparable] struct {
+	store map[K] V
+	rstore map[V] K
+}
+
+// Returns new empty UniqMap.
+func NewUniq[K, V comparable]() *UniqMap[K, V] {
+	return &UniqMap[K, V]{
+		make(map[K] V),
+		make(map[V] K),
+	}
+}
+
+// Sets new value v for the k key.
+func (m *UniqMap[K, V]) Set(k K, v V) {
+	m.store[k] = v
+	m.rstore[v] = k
+}
+
+// Get value by the k key.
+func (m *UniqMap[K, V]) Get(k K) (V, bool) {
+	v, ok := m.store[k]
+	return v, ok
+}
+
+func (m *UniqMap[K, V]) GetByValue(v V) (K, bool) {
+	k, ok := m.rstore[v]
+	return k, ok
+}
+
diff --git a/src/poolx/main.go b/src/poolx/main.go
index c2dc1c7..220ecf9 100644
--- a/src/poolx/main.go
+++ b/src/poolx/main.go
@@ -1,7 +1,7 @@
 package poolx
 
 import (
-	"github.com/surdeus/godat/src/llx"
+	"github.com/mojosa-software/godat/src/llx"
 )
 
 // Ordered value-only based structure.
diff --git a/src/rangex/range.go b/src/rangex/range.go
new file mode 100644
index 0000000..7b71049
--- /dev/null
+++ b/src/rangex/range.go
@@ -0,0 +1,55 @@
+package rangex
+
+import (
+	"github.com/mojosa-software/godat/src/iterx"
+	cnts "golang.org/x/exp/constraints"
+)
+
+
+type Range[V cnts.Ordered] struct {
+	start, step, end V
+}
+
+// Returns the new Range strucucture with corresponding start, step and end.
+// If the values can never reach the end then the function will return nil.
+func New[V cnts.Ordered](start, step, end V) *Range[V] {
+	return &Range[V]{
+		start, step, end,
+	}
+}
+
+func (r *Range[V]) Chan() iterx.PairChan[int, V] {
+	start, step, end := r.start, r.step, r.end
+	c := make(iterx.PairChan[int, V])
+	go func(){
+		var compare func(a, b V) bool
+		
+		less := func(a, b V) bool {
+			return a < b
+		}
+		
+		more := func(a, b V) bool {
+			return a > b
+		}
+		
+		if start < end {
+			compare = less
+		} else {
+			compare = more
+		}
+		
+		j := 0
+		for i := start ; compare(i, end) ; i += step {
+			c <- iterx.Pair[int, V]{
+				K:j,
+				V:i,
+			}
+			j++
+		}
+		
+		close(c)
+	}()
+	
+	return c
+}
+