fun-with-lists-indexof

Fun with lists: indexOf

Implement the method indexOf (index_of in PHP), which accepts a linked list (head) and a value, and returns the index (zero based) of the first occurrence of that value if exists, or -1 otherwise.

For example: Given the list: 1 -> 2 -> 3 -> 3, and the value 3, indexOf / index_of should return 2.

The linked list is defined as follows:

class Node {
  public Object data;
  public Node next;

  Node(T data, Node next) {
    this.data = data;
    this.next = next;
  }
  
  Node(T data) {
    this(data, null);
  }
}

Note: the list may be null and can hold any type of value.