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6 years ago
## listpushback
6 years ago
### Instructions
Write a function `ListRemoveIf` that removes all elements that are equal to the `data_ref` introduced in the argument of the function.
- In case the list is empty print the message `no data on list`.
- Use pointers wen ever you can.
6 years ago
### Expected function and structure
```go
type node struct {
data interface{}
next *node
}
type list struct {
head *node
tail *node
}
func ListRemoveIf(l *list, data_ref interface{}) {
}
```
6 years ago
### Usage
Here is a possible [program](TODO-LINK) to test your function :
```go
package main
import (
"fmt"
piscine ".."
)
func PrintList(l *list) {
m := l.head
for m != nil {
fmt.Print(m.data, " -> ")
m = m.next
}
fmt.Print(l.tail)
fmt.Println()
}
func main() {
link := &list{}
link2 := &list{}
link3 := &list{}
fmt.Println("------answer-----")
ListRemoveIf(link3, 1)
fmt.Println()
fmt.Println("----normal state----")
piscine.ListPushBack(link2, 1)
PrintList(link2)
ListRemoveIf(link2, 1)
fmt.Println("------answer-----")
PrintList(link)
fmt.Println()
fmt.Println("----normal state----")
piscine.ListPushBack(link, 1)
piscine.ListPushBack(link, "Hello")
piscine.ListPushBack(link, 1)
piscine.ListPushBack(link, "There")
piscine.ListPushBack(link, 1)
piscine.ListPushBack(link, 1)
piscine.ListPushBack(link, "How")
piscine.ListPushBack(link, 1)
piscine.ListPushBack(link, "are")
piscine.ListPushBack(link, "you")
piscine.ListPushBack(link, 1)
PrintList(link)
ListRemoveIf(link, 1)
fmt.Println("------answer-----")
PrintList(link)
}
```
And its output :
```console
student@ubuntu:~/piscine/test$ go build
student@ubuntu:~/piscine/test$ ./test
------answer-----
no data on list
----normal state----
1 -> <nil>
------answer-----
<nil>
----normal state----
1 -> Hello -> 1 -> There -> 1 -> 1 -> How -> 1 -> are -> you -> 1 -> <nil>
------answer-----
Hello -> There -> How -> are -> you -> <nil>
student@ubuntu:~/piscine/test$
```