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## listforeach
6 years ago
### Instructions
Write a function `ListForEach` that applies a function given as argument to the data within each node of the list `l`.
- The function given as argument must have a pointer as argument: `l *List`
- Copy the functions `Add2_node` and `Subtract3_node` in the same file as the function `ListForEach` is defined.
6 years ago
### Expected function and structure
```go
type NodeL struct {
Data interface{}
Next *NodeL
}
type List struct {
Head *NodeL
Tail *NodeL
}
func ListForEach(l *List, f func(*NodeL)) {
}
func Add2_node(node *NodeL) {
switch node.Data.(type) {
case int:
node.Data = node.Data.(int) + 2
case string:
node.Data = node.Data.(string) + "2"
}
}
func Subtract3_node(node *NodeL) {
switch node.Data.(type) {
case int:
node.Data = node.Data.(int) - 3
case string:
node.Data = node.Data.(string) + "-3"
}
}
```
6 years ago
### Usage
Here is a possible [program](TODO-LINK) to test your function :
```go
package main
import (
"fmt"
piscine ".."
)
func main() {
link := &piscine.List{}
piscine.ListPushBack(link, "1")
piscine.ListPushBack(link, "2")
piscine.ListPushBack(link, "3")
piscine.ListPushBack(link, "5")
piscine.ListForEach(link, piscine.Add2)
it := link.Head
for it != nil {
fmt.Println(it.Data)
it = it.Next
}
}
```
And its output :
```console
student@ubuntu:~/piscine-go/test$ go build
student@ubuntu:~/piscine-go/test$ ./test
12
22
32
52
student@ubuntu:~/piscine-go/test$
```