go学习笔记--多数组合并

时间:2022-09-03 12:02:41

go语言本身没有类似php中得array_merge的函数,无法直接实现多个数组的合并
但是这类操作在日常开发中真的是很常见,
有两种方案完成这个操作

1:append()
这个函数固然可以完成以上操作,但是使用append意味着遍历数组,意味着slice长度的动态扩展
只能说这招很笨
2:copy()
func copy

func copy(dst, src []Type) int

The copy built-in function copies elements from a source slice into a destination slice. (As a special case, it also will copy bytes from a string to a slice of bytes.) The source and destination may overlap. Copy returns the number of elements copied, which will be the minimum of len(src) and len(dst).

所以在使用copy的时候一定要防止重叠

具体内容不赘述,上代码:

package tool



type CommonFunc struct{}


var commonFunc CommonFunc


func (c *CommonFunc) Merge(s ...[]interface{}) (slice []interface{}) {
switch len(s) {
case 0:
break
case 1:
slice = s[0]
break
default:
s1 := s[0]
s2 := commonFunc.Merge(s[1:]...)//...将数组元素打散
slice = make([]interface{}, len(s1)+len(s2))
copy(slice, s1)
copy(slice[len(s1):], s2)
break
}


return
}

`