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Filtering rules in JSON format

When is this useful?

If you want to use the same filtering rules for js Array.filter and SQL where.

Usage

var where = require('db3-where')
where.query(filter)
//returns corresponding sql `where` clause
where.filter(filter)
//returns compare function, usable for Array.filter

SQL where

where.query({id: 1, name: 'Adam'})
// returns `id` = 1 and name = 'Adam'
where.query({id: [1, 2, 3]})
// returns `id` in (1, 2, 3)
where.query({id: {'>=': 1, '=<': 2}})
// returns `id` >= 1 and `id` =< 2

Array.filter

var fruit = [
  {id: 1, name: 'Banana'},
  {id: 2, name: 'Apple'},
  {id: 3, name: 'Apple'}
]
fruit.filter(where.filter(1))
// fruit will be
// [{id: 1, name: 'Banana'}]
fruit.filter(where.filter({id: [1, 2]}))
// fruit will be
// [{id: 1, name: 'Banana'}, {id: 2, name: 'Apple'}]
fruit.filter(where.filter({id: {'>=': 2, '<=': 3}}))
// fruit will be
// [{id: 2, name: 'Apple'}, {id: 3, name: 'Apple'}]