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backbone-calculate

0.0.3 • Public • Published

backbone-calculate Build Status

The calculation methods are inspired by Rails and taken a bit further. This package uses underscore-calculate under the hood which only considers numbers, and returns undefined for empty collections. We use this package to graph data from collections.

Each calculation method either returns a value, an array of values, or an object with fields and values depending on parameters. For each example, consider the following collection:

var collection = new Backbone.Collection;
collection.add(new collection.model({ a: 0, b: 2 }));
collection.add(new collection.model({ a: 2, b: 4 }));
 
// the following model won't end up in any calculations
collection.add(new collection.model({ a: null, b: undefined }));

average

collection.average('a');
// 1
 
collection.average('a', 'b');
// [ 1, 3 ]
 
collection.average([ 'a', 'b' ])
// { a: 1, b: 3 } 
 
collection.average( function(e) { return e.get('a') && e.get('b') && (e.get('a') * e.get('b')); } );
// 4

sum

collection.sum('a');
// 2
 
collection.sum('a', 'b');
// [ 2, 6 ]
 
collection.sum([ 'a', 'b' ])
// { a: 2, b: 6 }
 
collection.sum( function(e) { return e.get('a') && e.get('b') && (e.get('a') * e.get('b')); } );
// 8

maximum

collection.maximum('a');
// 2
 
collection.maximum('a', 'b');
// [ 2, 4 ]
 
collection.maximum([ 'a', 'b' ])
// { a: 2, b: 4 } 
 
collection.maximum( function(e) { return e.get('a') && e.get('b') && (e.get('a') * e.get('b')); } );
// 8

minimum

collection.minimum('a');
// 0
 
collection.minimum('a', 'b');
// [ 0, 2 ]
 
collection.minimum([ 'a', 'b' ])
// { a: 0, b: 2 } 
 
collection.minimum( function(e) { return e.get('a') && e.get('b') && (e.get('a') * e.get('b')); } );
// 0

Notes

To use backbone-calculate, copy the backbone.calculate.js file into your project and include it after backbone.

License: MIT

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Install

npm i backbone-calculate

Repository

github.com/glencrossbrunet/backbone-calculate

Homepage

github.com/glencrossbrunet/backbone-calculate

Weekly Downloads

0

Version

0.0.3

License

none

Last publish

Collaborators

  • aj0strow
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