GitBook: [main] 20 pages modified

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folex 2021-06-25 11:25:44 +00:00 committed by gitbook-bot
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* container
* VSCode extension\(s\)

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* functional
* theoretical foundation
see start: [https://hackmd.io/@k0-nEQfXQsuo0LE3OblOjg/HJ1DoCdIu](https://hackmd.io/@k0-nEQfXQsuo0LE3OblOjg/HJ1DoCdIu)

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# Types
### Scalars
## Scalars
Scalar types follow the Wasm IT notation.
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* Records \(product type\): see below
* Arrays: see Collection Types below
### Literals
## Literals
You can pass booleans \(true, false\), numbers, double-quoted strings as literals.
### Products
## Products
```python
data ProductName:
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Fields are accessible with the `.` operator, e.g. `product.field`.
### Collection Types
## Collection Types
Aqua has three different types with variable length, denoted by quantifiers `[]`, `*`, and `?`.
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You can access a distinct value of a collection with `!` operator, optionally followed by an index.
### Arrow Types
## Arrow Types
Every function has an arrow type that maps a list of input types to an optional output type.
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x <- arrow()
```
### Type Alias
## Type Alias
For convinience, you can alias a type:
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alias MyAlias = ?string
```
### Type Variance
## Type Variance
Aqua is made for composing data on the open network. That means that you want to compose things if they do compose, even if you don't control its source code.
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For arrow types, Aqua checks variance on arguments, contravariance on the return type.
### Type of a Service and a file
## Type of a Service and a file
A service type is a product of arrows. File is a product of all defined constants and functions \(treated as arrows\). Type definitions in the file does not go to the file type.
{% embed url="https://github.com/fluencelabs/aqua/blob/main/types/src/main/scala/aqua/types/Type.scala" caption="See the types system implementation" %}

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* Programmable network requests
* Extensible beyond peer-native services to Web2 resources
At the heart of the peer-to-peer programming model -- is this Fluence or Aquamarine ?
At the heart of the peer-to-peer programming model -- is this Fluence or Aquamarine ?
* _particle_
* _particle_
### A Taste Of Aqua
## A Taste Of Aqua
or a different example?
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<- res
```