Array e puntatore di Go

GoUn puntatore in un linguaggio di programmazione o in Golang è una variabile che viene utilizzata per memorizzare un altrovariabileindirizzo di memoria. EarrayIt is a fixed-length sequence used to store elements of the same type in memory.

You can use a pointer to an array and pass it as a parameter to the function. To understand this concept, let's take an example. In the following program, we will use a pointer array containing 5 elementsarr. We need to use the function to update this array. This means modifying the array internally (in this case, the array is{78, 89, 45, 56, 14}), and it will reflect at the caller's location. Therefore, here we useupdatearrayA function that has a pointer to an array as the parameter type. Usingupdatearray(&arr)The code (*funarr)[4] = 750 or funarr[4] = 750 uses dereferencing to assign a new value to the array, which will be reflected in the original array. Finally, the program will output [78 89 45 56 750].

//The Golang program passes the address of the array
//Array as a function parameter
package main
import "fmt"
//Define a function
func updatearray(funarr *[5]int) {
　　　　//Use the index value to change the array
　　　　(*funarr)[4] = 750
　　　　//You can also write
　　　　//The above code line
　　　　//funarr[4] = 750
}
func main() {
　　　　//Get the pointer to the array
　　　　arr := [5]int{78, 89, 45, 56, 14}
　　　　//Pass the pointer to the array
　　　　//And execute updatearray
　　　　updatearray(&arr)
　　　　//The updated array
　　　　fmt.Println(arr)
}

Output:

[78 89 45 56 750]

Note:In Golang, it is not recommended to use a pointer to an array as a function parameter because the code becomes difficult to read. Similarly, it is not a good method to implement this function. For this purpose, you can use a slice instead of passing a pointer.

//To explain the Golang program
//Use the slice as a function parameter
package main
import "fmt"
func updateslice(funarr []int) {
　　　　//Update the value
　　　　//Update the value at the specified index
　　　　funarr[4] = 750
}
func main() {
　　　　//Define a slice
　　　　s := [5]int{78, 89, 45, 56, 14}
　　　　//Pass the slice to
　　　　//Function updateslice
　　　　updateslice(s[:])
　　　　//Show the result
　　　　fmt.Println(s)
}

Output:

[78 89 45 56 750]