Colander is a simple rule-based filtering tool. Keep the stuff you want, discard the stuff you don't.
npm install colander
Code speaks louder than words, so here we go. Say we have some spaghetti that's just finished cooking, so it's still in the water...
var pot = [
{type: "spaghetti"},
{type: "water"},
{type: "spaghetti"},
{type: "water"},
{type: "water"},
{type: "spaghetti"},
{type: "spaghetti"},
{type: "water"},
]
var colander = require('colander')
var strainer = colander({
accept_when: {"type": "spaghetti"},
reject_when: {"type": "water"}
})
// test some individual objects
strainer.strain({type: "spaghetti"}) // => true
strainer.strain({type: "water"}) // => false
// strain the whole pot at once
strainer.strain(pot)