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#0Singly Linked List Visualizer
Visualize singly linked list insertion, deletion, search, and traversal with animated pointers, playback controls, and complexity insights.
Current status: Ready to follow a one-way chain from head to null.
One-way pointer playground
Singly Linked List Visualizer
Each node holds a value and one route forward. Follow the next pointer from the head until it reaches null.
Build your chain
Add, remove, and reconnect
Insert
Remove
Explore
Memory view
One link per node, one direction to follow
HEADfirst node
Head node
next→
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#1Node at index 1
next→
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333
#2Node at index 2
next→
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414
#3Node at index 3
next→
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#4Node at index 4
next→
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#5Tail node
NULLend of chain
Traversal output
Visited nodes
Run a traversal to reveal the order the chain is visited.
Under the hood
Pointer update sketch
Choose an operation, then open its concise Java pointer-update sketch. The highlighted node in the memory view shows where the action happened.
Why use a singly linked list?
A singly linked list stores a value and a next pointer in every node. It grows naturally without contiguous array storage, but reaching a node means walking from the head through the chain.
Head insertion
O(1)
Search
O(n)
Reverse
O(n)
Concept guide
Review the mental model, tradeoffs, and practical use cases after you experiment.
Singly Linked List Complete Info Card
Node-BasedSequential Access
A Singly Linked List consists of nodes with data and a next pointer, forming a linear sequence. Each node points to the next node, with the last node pointing to null.
Operations & Complexities
Insert at Head
Add new node at beginning
Insert at Tail
Add new node at end (requires traversal)
Delete at Head
Remove first node
Delete at Tail
Remove last node
Search
Find node by value
Access by Index
Traverse to position
Reverse List
Iterative or recursive approach
Advantages & Disadvantages
Pros
- ✓Dynamic size (no fixed capacity)
- ✓Efficient insertions/deletions at head
- ✓Memory efficient for large items
- ✓No memory waste (allocates per node)
Cons
- ✗No random access (sequential only)
- ✗Extra memory for pointers
- ✗Cache unfriendly (non-contiguous)
- ✗Complex implementation vs arrays
Linked List Variations
Circular Singly Linked List
Tail points to head instead of null
Sorted Singly Linked List
Maintains nodes in sorted order
Unrolled Linked List
Each node contains small array
Practical Applications
Implementation of Stacks/Queues
When dynamic size is needed
Music Playlist
Sequential access fits navigation
Undo Functionality
Maintaining state history
Polynomial Representation
Sparse polynomial terms
Hash Table Chaining
Collision resolution
Memory Visualization
Data
Next
→
Data
Next
→
NULL
Pro Tip: Use a dummy head node to simplify edge cases in linked list operations.
Dynamic sizeO(1) insert/delete at headSequential access