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/**
* 1) 数组的插入、删除、按照下标随机访问操作；
* 2）数组中的数据是int类型的；
*/
type Array struct {
data []int
length uint
}
//为数组初始化内存
func NewArray(capacity uint) *Array {
if capacity == 0 {
return nil
}
return &Array{
data: make([]int, capacity, capacity),
length: 0,
}
}
func (this *Array) Len() uint {
return this.length
}
//判断索引是否越界
func (this *Array) isIndexOutOfRange(index uint) bool {
if index >= uint(cap(this.data)) {
return true
}
return false
}
//通过索引查找数组，索引范围[0,n-1]
func (this *Array) Find(index uint) (int, error) {
if this.isIndexOutOfRange(index) {
return 0, errors.New("out of index range")
}
return this.data[index], nil
}
//插入数值到索引index上
func (this *Array) Insert(index uint, v int) error {
if this.Len() == uint(cap(this.data)) {
return errors.New("full array")
}
if index != this.length && this.isIndexOutOfRange(index) {
return errors.New("out of index range")
}
for i := this.length; i > index; i-- {
this.data[i] = this.data[i-1]
}
this.data[index] = v
this.length++
return nil
}
func (this *Array) InsertToTail(v int) error {
return this.Insert(this.Len(), v)
}
//删除索引index上的值
func (this *Array) Delete(index uint) (int, error) {
if this.isIndexOutOfRange(index) {
return 0, errors.New("out of index range")
}
v := this.data[index]
for i := index; i < this.Len()-1; i++ {
this.data[i] = this.data[i+1]
}
this.length--
return v, nil
}
//打印数列
func (this *Array) Print() {
var format string
for i := uint(0); i < this.Len(); i++ {
format += fmt.Sprintf("|%+v", this.data[i])
}
fmt.Println(format)
}
func TestInsert(t *testing.T) {
capacity := 10
arr := NewArray(uint(capacity))
for i := 0; i < capacity-2; i++ {
err := arr.Insert(uint(i), i+1)
if nil != err {
t.Fatal(err.Error())
}
}
arr.Print()
arr.Insert(uint(6), 999)
arr.Print()
arr.InsertToTail(666)
arr.Print()
}
func TestDelete(t *testing.T) {
capacity := 10
arr := NewArray(uint(capacity))
for i := 0; i < capacity; i++ {
err := arr.Insert(uint(i), i+1)
if nil != err {
t.Fatal(err.Error())
}
}
arr.Print()
for i := 9; i >= 0; i-- {
_, err := arr.Delete(uint(i))
if nil != err {
t.Fatal(err)
}
arr.Print()
}
}
func TestFind(t *testing.T) {
capacity := 10
arr := NewArray(uint(capacity))
for i := 0; i < capacity; i++ {
err := arr.Insert(uint(i), i+1)
if nil != err {
t.Fatal(err.Error())
}
}
arr.Print()
t.Log(arr.Find(0))
t.Log(arr.Find(9))
t.Log(arr.Find(11))
}
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