Go数组和切片定义和初始化

1 前言

切片是动态数组，数组数组是按值赋值，切片是按地址赋值（引用）

2 代码

2.1 数组初始化

func basic_array(){
	//var arr2 = [3]int{2,4,6} // 1

	//arr2 := [3]int{2,4,6} //2

	//var arr2[3]int = [3]int{2,4,6} //3

	//var arr2 [3]int  //4
	//arr2=[3]int{1,3,5}

	// var arr2 [3]int //5
	// var i int
	// for i=0;i<len(arr2);i++{
	// 	arr2[i] = 10+i;
	// }

        // var arr2 [3]int //6
        // var arr2 [...]int{1,3,7} //7[...]表示根据元素自适应大小

    for i,e := range arr2{
		fmt.Println("arr2[",i,"]->",e);
	}
}

2.2 切片初始化

func basic_slice(){

	//var arr2 = []int{2,4,6} // 1

	//arr2 := []int{2,4,6} //2

	//var arr2[]int = [3]int{2,4,6} //3

	//var arr2 []int  //4
	//arr2=[]int{1,3,5}

       //var slice1 []type = make([]type, len) //5
　　　　//slice1 := make([]type, len) //6
　　　　//also add parameter capacity
　　　　//make([]T, length, capacity) //7,8

	for i,e := range arr2{
		fmt.Println("arr2[",i,"]->",e);
	}

}

3 数组与切片区别

var arr2[3]int = [3]int{2,4,6}
	var arr1 = arr2
	arr1[1]=11

	for i,e := range arr1{
		fmt.Println("arr1[",i,"]->",e);
	}

	for i,e := range arr2{
		fmt.Println("arr2[",i,"]->",e);
	}

//result
// arr1[ 0 ]-> 2
// arr1[ 1 ]-> 11
// arr1[ 2 ]-> 6
// arr2[ 0 ]-> 2
// arr2[ 1 ]-> 4
// arr2[ 2 ]-> 6

//slice
var arr2[]int = []int{2,4,6}
	var arr1 = arr2
	arr1[1]=11

	for i,e := range arr1{
		fmt.Println("arr1[",i,"]->",e);
	}

	for i,e := range arr2{
		fmt.Println("arr2[",i,"]->",e);
	}

//result
// arr1[ 0 ]-> 2
// arr1[ 1 ]-> 11
// arr1[ 2 ]-> 6
// arr2[ 0 ]-> 2
// arr2[ 1 ]-> 11
// arr2[ 2 ]-> 6