go语言中数组与切片的区别

一句话总结：切片是动态数组，注意两者初始化和函数参数的区别

1、初始化：数组需要指定大小，不指定也会根据初始化的自动推算出大小，不可改变 

//var a [...]int = [...]int{1, 2, 3} //error

a := [...]int{1, 2, 3}

var a2 [3]int = [3]int{4, 5, 6}

切片不需要指定大小

var s []int = []int{1, 2, 3, 4}

2、函数传递：

数组需要明确指定大小，切片不需要。数组是值传递，切片是地址传递

package main

import "fmt"

func changeArray(a [3]int) {

a[0] = 100

}

func changeSlice(s []int) {

s[0] = 100

}

func main() {

//var a [...]int = [...]int{1, 2, 3} //error

a := [...]int{1, 2, 3}

changeArray(a)

fmt.Println(a[0]) //值传递

var a2 [3]int = [3]int{4, 5, 6}

a2[2] = 77

var s []int = []int{1, 2, 3, 4}

fmt.Println(len(s), cap((s)))

s = append(s, 6, 7, 8)

fmt.Println(len(s), cap(s))

changeSlice(s)

fmt.Println(s[0]) //地址传递

}

1

4 4

7 8

100

成功: 进程退出代码 0.