chap6-4txt about data_structures_and_algorithms_using_javascript HOT 1 OPEN

I didn't really understand your question but I can explain the above code line by line, hopefully, that helps,
the insert function needs to add a node with 'newElement' after the node that contains 'item'
-A newNode is created with newElement
-Current is a variable that holds the node with element called 'item'
-The newly created node, 'newNode' will have it's next property point to the Node that is in-front of the current node hence (newNode.next = current.next)
-The newNode's previous pointer will point to the current node
-The current note next pointer will now point to the newNode
This ensures that newNode inserts itself in-front of the node with element item or current
Hope this helps

from data_structures_and_algorithms_using_javascript.