Lesson 19 — Stream chunks

Process data piece by piece

A stream delivers data in chunks (small pieces) instead of all at once — like a video that plays while it downloads. Node uses streams for big files and network data: you handle each chunk as it arrives and never hold everything in memory.

Note: this playground runs JavaScript in your browser, not in real Node, so Node-only tools (like fs or http) are not available. The exercise is a small plain-JS simulation of the Node idea. The array of arrays below stands in for chunks arriving one after another.

Why it matters: streaming lets a small server handle files much bigger than its memory.