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10
docs/tut/crash-course/5-effect.md
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# Effects
Effects are functions that are ran in response to source updates. They are
called effects because they cause *side-effects* when reacting to source
updates.
A source and effect is analogous to a signal and connection.
Effects are created using `effect()`.
@ -21,11 +20,10 @@ count(1)
-- "count: 1" printed
```
The callback given to `effect()` is ran immediately in a *reactive scope*. Any
source read from inside a reactive scope will be tracked, so when any of those
sources update, the effect will be reran too.
Any source read inside an effect is tracked and will rerun the effect when
that source is updated.
Reactive scopes also track derived sources, it doesn't matter how deeply nested
Derived sources are also tracked, it doesn't matter how deeply nested
inside a function a source is.
```lua