This visual guide is designed for students who understand some code but need a stronger mental picture of how the data structure or algorithm behaves. Use the diagram first, then connect it to code.
Nodes connect by references, not indexes
Mental model
A linked list is a chain of objects. To change the list, students must change arrows in a safe order. The drawing should include head, current, previous, and any new node.
How it shows up in code
To insert after current, first point the new node at current.next. Then point current.next at the new node. Reversing that order can lose the rest of the list.
What to trace
Practice prompt
Draw the before-and-after arrows for removing the first node, a middle node, and the last node.
When students need support
Code Scholars helps students turn the visual model into implementation, tests, edge-case reasoning, and runtime analysis. This is especially useful when students can follow an explanation but struggle to write the code independently.