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Doug Turnbull

Jupyter Notebooks should have a mode where only the final variable output from a cell is visible to other cells (like Ruby function return value)

```
baz = 2
bar = 1
foo = baz + bar
foo
```

(only foo is visible to other cells)

@softwaredoug yes, observable does this and it's very handy for encapsulation, and lets it track data dependencies so it can be reactive