hasharray

hash-array

A data structure that combines a hash and an array for CRUD operations by object keys or index.

Complex key paths can be used.

Install

npm install hasharray

Testing

mocha

Example

Simple Usage

var HashArray = require ('hasharray');

// Create new hasharray with two key mappings.
var ha = new HashArray(['name', 'zip']);

// Add 2 objects to the hash. Key mappings are automatically created.
var item1 = {name: 'Josh', zip: '54321'};
var item2 = {name: 'Josh', zip: '12345'};
ha.add(item1, item2);

if (ha.has('Josh'))
{
  console.log(ha.get('Josh'));
}

// Display the number of unique objects. In this case, 2.
console.log(ha.all.length);

// Remove an element by key
ha.removeByKey('54321'); // This removes item1

// Remove item2 directly
ha.remove(item2); // This removes the first item that was added

Complex Keys

var HashArray = require ('hasharray');
var ha = new HashArray([
      ['name', 'last'],
      ['name', 'first'],
      'zip'
    ]);

ha.add({
    name: {
      first: 'Josh',
      last: 'Jung'
    },
    zip: 60616
  });

console.log(ha.get(60616) === ha.get('Josh') == ha.get('Jung'));

Key Duplicates

If two items contain the same key, they are appended to an array at that key location.

var HashArray = require ('hasharray');
var ha = new HashArray([
      ['name', 'last'],
      ['name', 'first']
    ]);

ha.add({
    name: {
      first: 'Josh',
      last: 'Jung'
    }
  },
  {
    name: {
      first: 'Josh',
      last: 'Mills'
    }
  },
  {
    name: {
      first: 'Josh',
      last: 'Willis'
    }
  });

console.log(ha.get('Josh').length); // Will be 3

The MIT License (MIT)

Copyright (c) 2014 Joshua Jung

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.