triecomplete

An in-memory node.js autocomplete package based on the trie data structure, based off the autocomplete module

npm install triecomplete
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Node Autocomplete

Node Autocomplete is an autocomplete library for node.js.

Installation

npm install -S autocomplete

Features

  • in memory, in process, not redis dependent
  • internal trie data structure to store the strings
  • super fast for adding, removing and lookups
  • performance tested for string lists of 500,000 words
  • high level of tests

Usage

var data = ['fruit', 'app', 'apple', 'banana']
// instatiate a new autocomplete object
var Autocomplete = require('autocomplete')
var auto = new Autocomplete()
auto.initialize(data)
// results will be an array with 0 or more elements
var results = auto.search('ap')

// here results will be an array of key-value pairs
console.dir(results)

Output

The output of the search is an array of objects with key and value properties. In the example above, results looks like

[
  {
    key: 'app',
    value: 'app'
  },
  {
    key: 'apple',
    value: 'apple,
  }
]

If you are just searching for strings you can get an array of matching strings by mapping the results and returning just the key

var data = ['fruit', 'app', 'apple', 'banana']
// instatiate a new autocomplete object
var Autocomplete = require('autocomplete')
var auto = new Autocomplete()
auto.initialize(data)
// results will be an array with 0 or more elements
var results = auto.search('ap')

// here results will be an array of key-value pairs
console.dir(results)
var stringMatches = results.map(function (result) {
  return result.key
})
// stringMatches is ['app', 'apple']
console.dir(stringMatches)

Adding

You can add to the list of candidate elements after the autocomplete object has been initialized

var Autocomplete = require('autocomplete')
var auto = new Autocomplete()
var data = []
auto.initialize(data)
auto.addElement('cheeseburger')

Removing

You can remove from the list of candidate elements after the autocomplete object has been initialized

var Autocomplete = require('autocomplete')
var auto = new Autocomplete()
var data = ['app', 'apple', 'apples']
auto.initialize(data)
auto.removeElement('apple')

Object Elements

You can also add key value pairs as an array of 2 elements

var Autocomplete = require('autocomplete')
var auto = new Autocomplete()
var data = ['app', 'apple', ['apples', 'yummy'], 'banana' ]
auto.initialize(data)
var results = app.search('ap')
// in the results, there will be an element with the key *apples* and the value *yummy*
console.dir(results)

In the example above, results looks like

[
  { key: 'app', value: 'app' },
  { key: 'apple', value: 'apple' },
  { key: 'apples', value: 'yummy' }
]

Running Tests

Install development dependencies:

npm install

Then:

npm test

Actively tested with node:

  • 0.8.22

Authors

  • Noah Isaacson
  • Marc Campbell

Original source code based on https://github.com/marccampbell/node-autocomplete

License

(The MIT License)

Copyright (c) 2011 Marc Campbell <marc.e.campbell@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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