https://github.com/ashwanthkumar/predicates

Missing methods on (T => Boolean) functions.
https://github.com/ashwanthkumar/predicates

Last synced: about 8 hours ago
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Missing methods on (T => Boolean) functions.

• Host: GitHub
• URL: https://github.com/ashwanthkumar/predicates
• Owner: ashwanthkumar
• Created: 2014-12-26T22:41:02.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2014-12-27T06:52:12.000Z (almost 10 years ago)
• Last Synced: 2024-04-14T09:19:02.235Z (7 months ago)
• Language: Scala
• Size: 215 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
[![Build Status](https://snap-ci.com/ashwanthkumar/predicates/branch/master/build_image)](https://snap-ci.com/ashwanthkumar/predicates/branch/master)

# predicates

Wouldn't it be so nice if we can do something like `(validUserName and validPassword and validCaptcha) thenDo Success` where `validUserName`, `validPassword` and `validCaptcha` are functions of type `T => Boolean`. `predicates` helps you do exactly that. 

It provides simple wrapper methods to pimp your `T => Boolean` functions with `and`, `or` and `not` so that we can write more expressive[subjective] code. 

## Dependencies

`predicates` is published for the following scala versions: `2.11`, `2.10`, `2.9.3`, `2.9.2`, `2.9.1`.

For Maven

```xml

  in.ashwanthkumar

  predicates_${scala.version}

  0.0.2

```

For SBT,

```sbt

libraryDependencies += "in.ashwanthkumar" %% "predicates" % "0.0.2"

```

## Usage

I prefer to use predicates while writing data validators.

```scala

import in.ashwanthkumar.predicates._

case class Model(id: Int, name: String)

class ModelValidator {

    def hasId = (model: Model) => model.id > 0

    def hasName = (model: Model) => model.name != null && !model.name.isEmpty

    def all = hasId and hasName

    def any = hasId or hasName

    def validate = (all thenDo Success) orElse (not(all) thenDo Failure)

}

```

## Dev

```bash

$ git clone https://github.com/ashwanthkumar/predicates.git

$ cd predicates

$ sbt test

```

## License

[Apache 2.0](http://www.apache.org/licenses/LICENSE-2.0)