public/tests/go/solutions/listforeach.go

package solutions

// applies a function in argument to each element of the linked list
func ListForEach(l *List, f func(*NodeL)) {
	it := l.Head
	for it != nil {
		f(it)
		it = it.Next
	}
}

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"
	}
}