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docs/guide/src/en/async/use_effect.md
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[`use_effect`](https://docs.rs/dioxus-hooks/latest/dioxus_hooks/fn.use_effect.html) provides a future that executes after the hooks have been applied.
Whenever the hooks dependencies change, the future will be re-evaluated. This is useful to syncrhonize with external events.
Whenever the hooks [dependencies](#dependencies) change, the future will be re-evaluated. This is useful to syncrhonize with external events.
If a future is pending when the dependencies change, the previous future will be allowed to continue
> The `dependencies` is tuple of references to values that are `PartialEq + Clone`.
## Dependencies
You might want to call `use_effect` only when some value changes. For example, you might want to fetch a user's data only when the user id changes. You can provide a tuple of "dependencies" to the hook. It will automatically re-run the future when any of those dependencies change.
Example:
```rust, no_run
#[inline_props]