https://github.com/georgesalkhouri/ts-specification

Specification pattern implementation for NodeJS in TypeScript
https://github.com/georgesalkhouri/ts-specification

javascript specification-pattern typescript

Last synced: 10 months ago
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Specification pattern implementation for NodeJS in TypeScript

• Host: GitHub
• URL: https://github.com/georgesalkhouri/ts-specification
• Owner: GeorgesAlkhouri
• License: apache-2.0
• Created: 2016-05-16T20:17:32.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2016-09-28T20:36:50.000Z (over 9 years ago)
• Last Synced: 2025-03-24T20:11:26.409Z (11 months ago)
• Topics: javascript, specification-pattern, typescript
• Language: JavaScript
• Homepage:
• Size: 14.6 KB
• Stars: 17
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
Specification pattern for JavaScript implemented with TypeScript

================================================================

[![Build Status](https://travis-ci.org/GeorgesAlkhouri/ts-specification.svg?branch=master)](https://travis-ci.org/GeorgesAlkhouri/ts-specification)

> In computer programming, the specification pattern is a particular software design pattern, whereby business rules can be recombined by chaining the business rules together using boolean logic.

>

> -- Wikipedia.org ( https://en.wikipedia.org/wiki/Specification_pattern )

Usage With Node

---------------

To use ts-specification with Node just run:

`npm install ts-specification`

and import the package afterwards:

`import Specification from 'ts-specification'`

The test cases are written in JavaScript and can be tested with:

`npm test`

Create Custom Specs

-------------------

To create custom specifications just extend from the `CompositeSpecification` class and implement the `isSatisfiedBy` function.

**TypeScript**

```

class RangeSpecification extends CompositeSpecification {

  private a: T

  private b: T

  constructor(a: T, b: T) {

      super()

      this.a = a

      this.b = b

  }

  isSatisfiedBy(candidate: T): boolean {

      return candidate >= this.a && candidate <= this.b

  }

}

```

**JavaScript**

```

import {CompositeSpecification} from 'ts-specification';

class TrueSpecification extends CompositeSpecification {

    isSatisfiedBy(candidate) {

        return true;

    }

}

```