Full Disclosure – Visualizing JavaScript with the CSE Machine
summary
A browser-based visualizer called CSE Machine animates JavaScript execution by showing the actual control and stash stacks and the environment tree, with undergraduate-built animations inside Source Academy. It demonstrates closure environments (closures carry their creation frame), shows arrays live outside environment frames so objects are referenced, and reproduces the loop-capture surprise where stored functions all return 10 not 5. The tool evaluates argument evaluation, block entry/exit, and restores environments step by step.
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chapters (14)
- 0:00CSE machine for JavaScript
- 3:04JavaScript tools limitations
- 5:15Notional machine in teaching
- 8:04Tricky JS examples explained
- 10:19CSE machine concept
- 13:15CSE machine program state
- 16:09Environments in CSE machine
- 18:38Compound data structures
- 21:07Key takeaways
- 21:52Pass-by-value explained
- 24:25Closures and memory
- 26:53While loop analysis
- 30:31Future plans and tools
- 31:11Q&A
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