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