题目, 下面的代码输出
package mainimport ( "fmt")func rangeAppend() { v := []int{1, 2, 3} for i := range v { v = append(v, i) } fmt.Printf("%v", v)}func main() { rangeAppend()}golang playground https://play.golang.org/p/MxP…
为什么上面的程序输出
[1 2 3 0 1 2]对于不同种类的range表达式结果值，for语句的迭代变量的数量可以有所不同, 代码中只有一个迭代变量的情况意味着什么呢？这意味着，该迭代变量只会代表当次迭代对应的元素值的索引值
下面代码中的i 是索引值, 0 1 2
for i := range v { v = append(v, i) }for语句的迭代变量是两个, 第一个是索引值, 第二个是迭代的值
package mainimport ( "fmt")func rangeAppend() { v := []int{1, 2, 3} for _, i := range v { v = append(v, i) } fmt.Printf("%v", v)}func main() { rangeAppend()}上面输出
[1 2 3 1 2 3]给这篇文章的作者打赏
文章来源：智云一二三科技
文章标题：golang for range 只有一个迭代变量?
文章地址：https://www.zhihuclub.com/4890.shtml
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