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SORTING / 001Interactive sorting demo

Bubble sort

O(n²)

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Compare adjacent values; swap when the left value is larger.

Step through the full lesson, then predict the next move.

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Begin with bubble sort: watch adjacent numbers swap, try a different input, then check your understanding. No account or payment needed to begin.

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Your next steps

1. Watch the animation. Use Play, Pause and Step to follow each operation.
2. Try it yourself. Change the input and answer the prediction challenge.
3. Check your understanding. Take the quiz, then explore arrays and Big O.

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THE LEARNING MAP

Four tracks. One curious mind.

From your first array to your next architecture interview.

Data structures & algorithms

Turn abstract patterns into practical problem-solving skills.

Arrays · Trees · Graphs · Dynamic programming

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System design

See how small building blocks become systems at scale.

Caching · Queues · Replication · Case studies

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Database principles

Look beneath the query and understand your data.

Indexes · Transactions · Joins · Isolation

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Cloud, connected

Learn the architecture, then map it to AWS and GCP.

Compute · Networking · Storage · Reliability

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SMALL STEPS. REAL UNDERSTANDING.

Watch it. Try it. Make it stick.

Read the explanation, then play and step through the visualizer
2Change the input and predict what happens next
3Take the quiz, save a note, and return to review

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New here? Start with one free lesson.

Begin with bubble sort: watch adjacent numbers swap, try a different input, then check your understanding. No account or payment needed to begin.

Your next steps

1. Watch the animation. Use Play, Pause and Step to follow each operation.

2. Try it yourself. Change the input and answer the prediction challenge.

3. Check your understanding. Take the quiz, then explore arrays and Big O.