the way to go:练习7.11和练习7.12

golang学习，切片操作。

/**
将一个切片从start位置开始，删除length个元素
 */
func removeStringSlice(slice []string, start, length int) []string {
    if ( start + length ) > len(slice) {
        panic("越界")
    }
    return append( slice[:start], slice[start+length:]... )
}

将切片s1插入到s2的指定位置 index处
func insertIntSlice(s1, slice []int, index int) []int {
    return append( slice[:index] , append(s1,slice[index:]...)... )
}

/**
将切片s1插入到s2的指定位置 index处
 */
func insertStringSlice(s1, s2 []int, index int) []int {
    if index > len(s2){
        panic("位置不存在")
    }

    //将目标切片按照指定位置分为两个临时切片
    tmp1 := s2[:index]
    tmp2 := s2[index:]

    //创建一个长度为s1+s2的切片用于存储两个切片的值
    newTmp := make([]int, len(s2)+len(s1))

    //重组切片
    copy(newTmp, tmp1)
    copy(newTmp[index:len(s1)+index], s1)
    copy(newTmp[len(newTmp)-len(tmp2):], tmp2)
    return newTmp
}

func main(){
    slice := []string{"a","b","c","d","e","f","g"}
    resRemoveString := removeStringSlice(slice,1,4)
    fmt.Println(resRemoveString)

    s2 := []int{1,2,3,4,5}
    s1 := []int{33,22,11}
    resInsert := insertIntSlice(s1,s2,4)
    fmt.Println(resInsert)

    ss1 := []int{1,2,3,4,5}
    ss2 := []int{10,20,30,40,50}
    index := 2
    ss2 = insertStringSlice(ss1, ss2, index)
    fmt.Println(ss2)
}

运行结果

[a f g]
[1 2 3 4 33 22 11 5]
[10 20 1 2 3 4 5 30 40 50]

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