https://github.com/panthershark/pipeline

Node.js module for simplifying and sequencing a number of dependent functions and callbacks.
https://github.com/panthershark/pipeline

Last synced: about 2 months ago
JSON representation

Node.js module for simplifying and sequencing a number of dependent functions and callbacks.

• Host: GitHub
• URL: https://github.com/panthershark/pipeline
• Owner: panthershark
• Created: 2012-06-26T00:25:04.000Z (over 12 years ago)
• Default Branch: master
• Last Pushed: 2014-03-17T15:51:27.000Z (almost 11 years ago)
• Last Synced: 2024-04-15T14:27:04.730Z (9 months ago)
• Language: JavaScript
• Size: 191 KB
• Stars: 13
• Watchers: 2
• Forks: 3
• Open Issues: 4
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

        
pipeline

========

Node.js module for simplifying and sequencing a number of dependent functions and callbacks.

Simple module to performing asynchronous inter-dependent series operations in node.  Unlike other more complicated approaches, this is pure javascript and very small (~100 lines of code with comments).

# Install

```

npm install node-pipeline

```

# Simple example for calculating gratuity

This example is in the tests folder.  It is basic and does not fully test all error conditions, but it is a good way to get the hang of the module.

``` javascript

var pipeline = require('node-pipeline'),

	pl = pipeline.create("Tax and Gratuity Calculator");

pl.on('end', function(err, results) {

	if (err) {

		console.log('Error in pipeline: ' + err);

	}

	console.log("Raw results" + JSON.stringify(results, 2) );

	process.exit();

});

pl.use(function(results, next) {

	var price = Number(results[0].price),

		taxrate = Number(results[0].taxrate);

	next(null, { tax : price * taxrate });

});

pl.use(function(results, next) {

	var price = Number(results[0].price),

		tax = Number(results[1].tax),

		gratuityrate = Number(results[0].gratuityrate);

	next(null, { gratuity : (price + tax) * gratuityrate }) 

});

pl.execute({

	currency: "USD",

	symbol: "$",

	price: argv.price || 0,

	taxrate: argv.tax || 0.0825,

	gratuityrate: argv.gratuity || "0.25"

});

```