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order-by

v1.0.0

Published

order objects in an array by the order their keys occur in another array

Downloads

6

Readme

order-by

order the records of one file (or array) by the order of keys in another

npm install -g order-by

Usage


% cat x
rs4477212       AA
rs3094315       AA
rs3131972       GG
rs12124819      AA
rs11240777      GG

# we'll sort these according to their order in the second file

% cat y
rs11240777
rs12124819
rs3094315
rs3131972
rs4477212

# boom

% order-by x 1 y
rs11240777      GG
rs12124819      AA
rs3094315       AA
rs3131972       GG
rs4477212       AA

The method also works on objects, but must be called from javascript:

// we'd like to sort this by the order in b
var a = [{key:'one',value:'x'},
         {key:'two',value:'x'},
         {key:'two',value:'y'},
         {key:'three',value:'x'},
         {key:'wee',value:'y'},
         {key:'four',value:'x'}]

// our order
var b = ['four','two','three','one']

var orderBy = require('order-by')

// use the value of 'key' in a when sorting according to b
orderBy(a, 'key', b)
/*
[ { key: 'four', value: 'x' },
  { key: 'two', value: 'x' },
  { key: 'two', value: 'y' },
  { key: 'three', value: 'x' },
  { key: 'one', value: 'x' },
  { key: 'wee', value: 'y' } ]
*/

Note that elements which aren't in the order which is supplied are sorted at the end (under key undefined).

Elements with the same key are sorted at the same position.

Rationale

This module allows a sorted order in one file to be applied to any other.

License

MIT