golang slice copy一个小坑

今天遇到了一个slice在copy中的坑,在复制时一定要注意,目标slice的len是大于源slice的len.(不是cap)
直接上代码:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
package main

import "fmt"

func main() {
	srcSlice := []string{"hello","world"}
	copy1 := []string{}
	copy2 := make([]string, len(srcSlice))
	copy(copy1, srcSlice)
	copy(copy2, srcSlice)
	fmt.Printf("srcSlice:%v \n",srcSlice)
	fmt.Printf("copy1:%v \n",copy1)
	fmt.Printf("copy2:%v \n",copy2)
}

1
console:
    srcSlice:[hello world] 
    copy1:[] 
    copy2:[hello world]
golang
golang