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                Go 語言切片是對數組的抽象。 Go 數組的長度不可改變,在特定場景中這樣的集合就不太適用,Go中提供了一種靈活,功能強悍的內置類型切片("動態數組"),與數組相比切片的長度是不固定的,可以追加元素,在追加時可能使切片的容量增大。 定義方式: ~~~ 1) make ( []Type ,length, capacity ) 2) make ( []Type, length) 3) []Type{} 4) []Type{value1 , value2 , ... , valueN } ~~~ 從3)和4)可見,創建切片跟創建數組唯一的區別在于 Type 前的"[]"中是否有數字或....,沒有表示切片,否則表示數組。 ## 一、示例 ~~~ package main import ( "fmt" ) func main() { slice1 := make([]int32, 5, 8) slice2 := make([]int32, 9) slice3 := []int32{} slice4 := []int32{1, 2, 3, 4, 5} fmt.Println(slice1) fmt.Println(slice2) fmt.Println(slice3) fmt.Println(slice4) } ~~~ 結果: ~~~ [0 0 0 0 0] [0 0 0 0 0 0 0 0 0] [] [1 2 3 4 5] ~~~ ## 二、append()追加元素 ~~~ package main import ( "fmt" ) func main() { slice := []int32{} slice = append(slice, 1, 2, 3) fmt.Println(slice, "長度:", len(slice), "容量:", cap(slice)) } ~~~ 結果: ~~~ [1 2 3] 長度: 3 容量: 4 ~~~ ## 三、切片(索引從0開始,包左不包右) ~~~ numbers := []int{0, 1, 2, 3, 4, 5, 6, 7, 8} fmt.Println(numbers[1:4]) // >=1 && <4 fmt.Println(numbers[:3]) // <3 fmt.Println(numbers[4:]) // >=4 ~~~ 結果: ~~~ numbers[1:4] == [1 2 3] numbers[:3] == [0 1 2] numbers[4:] == [4 5 6 7 8] ~~~ ## 四、copy()復制 ~~~ numbers := []int{0, 1, 2, 3, 4, 5, 6, 7, 8} numbers2 := []int{} copy(numbers2, numbers) // 把numbers復制到numbers2 fmt.Println(numbers2) ~~~ 結果: ~~~ numbers2 == [0 1 2 3 4 5 6 7 8] ~~~
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