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Custom extrinsic formats (docs) (#1429)

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* Custom extrinsic formats (docs)

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Jaco Greeff
2019-09-30 14:42:06 +02:00
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docs/start/api.query.subs.md
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Previously we explained the concepts between `api.query`. In this section we will expand on that knowledge to introduce subscriptions (akin to what we found in `api.rpc`) to stream results from the state, as it changes between blocks.
## Subcriptions
## Subscriptions
As in the case with `api.rpc` subscriptions, query subscriptions follow exactly the same form - an actual call is augmented with a callback to return the current state value that is updated as the underlying value changes. As an example, we can extend on what we had previously -