diff --git a/hashmap/hashmap.go b/hashmap/hashmap.go
new file mode 100644
index 0000000..26ee198
--- /dev/null
+++ b/hashmap/hashmap.go
@@ -0,0 +1,42 @@
+package hashmap
+
+import (
+	"474420502.top/eson/structure/sparse_array/array3"
+)
+
+type HashCode func(key interface{}) int
+type EqualsCode func(k1, k2 interface{}) int
+
+type HashMap struct {
+	growfactor int
+	table      *array3.Array3
+
+	GetHash  HashCode
+	IsEquals EqualsCode
+}
+
+type Bucket struct {
+}
+
+func HashInt(key interface{}) uint {
+	thekey := uint(key.(int))
+	hbit := thekey & 0xffffffff
+	lbit := (thekey & 0xffffffff00000000) >> 32
+	// log.Println(hbit)
+	// log.Println(lbit)
+	// log.Println()
+	return lbit ^ hbit
+}
+
+func New() *HashMap {
+	hm := &HashMap{}
+	hm.growfactor = 2
+	hm.table = array3.NewWithCap(hm.growfactor*2, hm.growfactor, hm.growfactor)
+	return hm
+}
+
+func (hm *HashMap) Put(key, value interface{}) {
+	hash := hm.GetHash(key)
+	index := hash % hm.table.Cap()
+	hm.table.Set(index, value)
+}
diff --git a/hashmap/hashmap_test.go b/hashmap/hashmap_test.go
new file mode 100644
index 0000000..76935df
--- /dev/null
+++ b/hashmap/hashmap_test.go
@@ -0,0 +1,7 @@
+package hashmap
+
+import "testing"
+
+func TestCount(t *testing.T) {
+	HashInt(123123131221)
+}
diff --git a/sparse_array/array2/array2.go b/sparse_array/array2/array2.go
index 9611e90..ca0bbef 100644
--- a/sparse_array/array2/array2.go
+++ b/sparse_array/array2/array2.go
@@ -108,6 +108,29 @@ func (arr *Array2) Get(idx int) (interface{}, bool) {
 	return v, v != nil
 }
 
+func (arr *Array2) GetOrSet(idx int, DoSetValue func([]interface{}, int)) (result interface{}, isSet bool) {
+	yindex := idx / arr.xsize
+	xindex := idx % arr.xsize
+
+	xdata := arr.data[yindex]
+	if xdata == nil {
+		xdata = make([]interface{}, arr.xsize, arr.xsize)
+		arr.data[yindex] = xdata
+	}
+
+	result = xdata[xindex]
+	if result == nil {
+		DoSetValue(xdata, xindex)
+		result = xdata[xindex]
+		if result == nil {
+			panic("DoSetValue Not Set <nil> Value")
+		}
+		arr.sizes[yindex]++
+		return result, true
+	}
+	return result, false
+}
+
 func (arr *Array2) Del(idx int) (interface{}, bool) {
 	yindex := idx / arr.xsize
 	xindex := idx % arr.xsize
diff --git a/sparse_array/array3/array3.go b/sparse_array/array3/array3.go
index bde429a..ad78953 100644
--- a/sparse_array/array3/array3.go
+++ b/sparse_array/array3/array3.go
@@ -163,6 +163,38 @@ func (arr *Array3) Get(idx int) (interface{}, bool) {
 	return v, v != nil
 }
 
+func (arr *Array3) GetOrSet(idx int, DoSetValue func([]interface{}, int)) (result interface{}, isSet bool) {
+	zindex := idx / arr.xyproduct
+	nidx := (idx % arr.xyproduct)
+	yindex := nidx / arr.xsize
+	xindex := nidx % arr.xsize
+
+	ydata := arr.data[zindex]
+	if ydata == nil {
+		ydata = make([][]interface{}, arr.ysize, arr.ysize)
+		arr.data[zindex] = ydata
+	}
+
+	xdata := ydata[yindex]
+	if xdata == nil {
+		xdata = make([]interface{}, arr.xsize, arr.xsize)
+		ydata[yindex] = xdata
+		arr.ysizes[zindex]++
+	}
+
+	result = xdata[xindex]
+	if result == nil {
+		DoSetValue(xdata, xindex)
+		result = xdata[xindex]
+		if result == nil {
+			panic("DoSetValue Not Set <nil> Value")
+		}
+		arr.xsizes[zindex][yindex]++
+		return result, false
+	}
+	return result, true
+}
+
 func (arr *Array3) Del(idx int) (interface{}, bool) {
 	zindex := idx / arr.xyproduct
 	nextsize := (idx % arr.xyproduct)