Return Data Not Nodes 🐞

Return Data (Not Node)

Here is a sketch of our node

Note:

Assume "message sender" is the sender of the method "first", "last", etc
The message sender will expect to get data (not a node) -- in this case the data is a City object
Our nodes are private -- the message sender doesn't need to know about them

It is easy for us to return data (not a node) -- we can simply use: "aNode.getData()".

first

From the previous sketch we know how to get data from a node.

How would we get the first element (data)? [For the example shown, we would expect first to be the City object "BP"]

//Assume we are coding inside
//the LinkedList class (our context)
let node = this.firstNode;
let data = (node != null) ? node.getData() : null;

last

How would we get the last data (element)? [For the example shown, we would expect last to be the City object "NH"]

//Assume we are coding inside
//the LinkedList class (our context)
let node = this.lastNode;
let data = (node != null) ? node.getData() : null;