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## btreeapplyinorder
6 years ago
### Instructions
Write a function that applies a function in order to each element in the tree.
(see `in order tree walks`)
6 years ago
### Expected function
```go
func BTreeApplyInorder(root *TreeNode, f func(...interface{}) (int, error)) {
}
```
6 years ago
### Usage
Here is a possible [program](TODO-LINK) to test your function :
```go
package main
import (
"fmt"
piscine ".."
)
func main() {
root := &piscine.TreeNode{Data: "4"}
piscine.BTreeInsertData(root, "1")
piscine.BTreeInsertData(root, "7")
piscine.BTreeInsertData(root, "5")
piscine.BTreeApplyInorder(root, fmt.Println)
}
```
And its output :
```console
student@ubuntu:~/piscine-go/test$ go build
student@ubuntu:~/piscine-go/test$ ./test
1
4
5
7
student@ubuntu:~/piscine-go/test$
```