1. 相同点
- 都是内建函数,都是在堆上分配内存,都需要传递类型参数
2. 不同点
- 传递的参数不一样,new函数只接收一个参数,make函数可以接收一个以上的参数
package main
import "fmt"
func main() {
intZeroValuePoint := new(int)
fmt.Printf("%v\n", intZeroValuePoint)
intHasInitLenSlice := make([]int, 5, 10)
fmt.Printf("%v\n", intHasInitLenSlice)
}
- 返回的参数类型不一样,new函数返回对应输入参数类型的指针类型,make函数返回输入参数类型
package main
import "fmt"
func main() {
intZeroValuePoint := new(int)
fmt.Printf("%T\n", intZeroValuePoint)
intHasInitLenSlice := make([]int, 5, 10)
fmt.Printf("%T\n", intHasInitLenSlice)
}
- 使用场景不一样,new函数为类型分配类型对应零值内存并返回指针,make是为特定引用类型slice map chan 分配内存
package main
import "fmt"
func main() {
intZeroValuePoint := new(int)
fmt.Printf("%T\n", intZeroValuePoint)
sliceZeroValuePoint := new([]int)
fmt.Printf("%T: %v\n", sliceZeroValuePoint, sliceZeroValuePoint)
intHasInitLenSlice := make([]int, 5, 10)
fmt.Printf("%T\n", intHasInitLenSlice)
mapValue := make(map[string]string, 10)
fmt.Printf("%T\n", mapValue)
chanValue := make(chan int, 10)
fmt.Printf("%T\n", chanValue)
}