https://github.com/todesking/arrow_builder.scala

https://github.com/todesking/arrow_builder.scala

Last synced: about 1 year ago
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• Host: GitHub
• URL: https://github.com/todesking/arrow_builder.scala
• Owner: todesking
• License: mit
• Created: 2015-11-07T07:25:36.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2015-11-07T07:54:46.000Z (over 10 years ago)
• Last Synced: 2025-04-09T00:25:37.548Z (about 1 year ago)
• Language: Scala
• Size: 0 Bytes
• Stars: 10
• Watchers: 4
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Arrow builder for Scala

Poor man's `proc` notation (GHC) for Scala.

## Current status

Very experimental

## Usage

```scala

import com.todesking.arrow_builder.ArrowSyntax._

import com.todesking.arrow_builder.ArrowBuilder

def arr[A, B](f: A => B): MyArrow[A, B] = ???

ArrowBuilder.build[MyArrow, Int, String] { in =>

  a <- arr[Int, Int](_ + 1) -< in

  b <- arr[Int, Int](_ + 2) -< in

  a_b <- arr[(Int, Int), Int] { case (a, b) => a * b } -< a.zip(b)

  s <- arr[Int, String](_.toString) -< a_b

} yield a_b

```

## ArrowDelayLoop

`ArrowLoop` typeclass is not fit to Scala because it requires lazy evaluation.

Instead, we provide `ArrowDelayLoop` typeclass. It is analogue of `ArrowLoop` + `Arrowinit`,

but only provides `delayLoop[A, B, C](init: A, arrow: F[(A, C), (B, C)]): F[A, B]` method.

## rec

Theres no `rec`. Use `ArrowBuilder.delayLoop`