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                > # 是淺拷貝還是深拷貝 > ### 例子一 ``` package main import "fmt" func main() { s1 := []int{1, 2, 3, 4, 5} s2 := make([]int, 0, 3) s3 := make([]int, 3, 3) //嘗試將 s1 中的元素復制到 s2。由于 s2 的長度為0,實際并不會復制任何元素。 //n2 表示復制的元素個數,這里將會是0。 n2 := copy(s2, s1) n3 := copy(s3, s1) fmt.Println("S1:", s1) fmt.Println("S2:", s2, n2) fmt.Println("S3:", s3, n3) } ``` >### 例子二 ~~~ package main import "fmt" func main() { s1 := []int{1, 2, 3, 4, 5} s2 := make([]int, len(s1), len(s1)) copy(s2, s1) s1[0] = 2 //當切片的元素類型是引用類型(如映射、切片、指針、通道等)時,copy 函數會復制這些引用,而不是它們引用的值 s3 := []map[string]int{{"A": 1}, {"B": 2}, {"C": 3}, {"D": 4}, {"E": 5}} s4 := make([]map[string]int, len(s3), len(s3)) copy(s4, s3) s3[0]["A"] = 6 fmt.Println("S1:", s1) fmt.Println("S2:", s2) fmt.Println("S3:", s3) fmt.Println("S4:", s4) } ~~~ > ### 例子三 - 解決例子二的問題 ~~~ package main import "fmt" func main() { s3 := []map[string]int{{"A": 1}, {"B": 2}, {"C": 3}, {"D": 4}, {"E": 5}} s4 := DeepCopySliceOfMaps(s3) s3[0]["A"] = 6 fmt.Println("S3:", s3) fmt.Println("S4:", s4) } func DeepCopySliceOfMaps(slice []map[string]int) []map[string]int { // 創建一個新的切片,與原始切片長度相同 newSlice := make([]map[string]int, len(slice)) // 遍歷原始切片 for i, m := range slice { // 創建一個新的 map,用于存儲拷貝后的數據 newMap := make(map[string]int) // 遍歷原始 map for k, v := range m { // 將鍵值對拷貝到新的 map 中 newMap[k] = v } // 將新的 map 添加到新的切片中 newSlice[i] = newMap } return newSlice } ~~~
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