group-by-prototype

Group an Array of objects by key or with a function.

Installation

npm install --save group-by-prototype

Usage

example reading last 50 lines of a file

require('group-by-prototype');
const data = [
  {
    "key": "word",
    "value": "hello"
  }, {
    "key": "word",
    "value": "world"
  }, {
    "key": "number",
    "value": 2
  }
];
let groupedByKey = data.groupBy("key");

let groupedEvenOdd = [4,9,5,8,1,6,3,0,2,7].groupBy((x, i) => { return x % 2 === 0 ? "even" : "odd"});
/*
  {
    "even": [4,8,6,0,2],
    "odd": [9,5,1,3,7]
  }
*/
let groupedIndexEvenOdd = [8,6,4,2,0,1,3,5,7,9].groupBy((x, i) => { return i % 2 === 0 ? "even" : "odd"});
/*
  {
    "even": [4,5,1,3,2],
    "odd": [9,8,6,0,7]
  }
*/

Contributing

1. Fork it on Github https://github.com/alexbbt/group-by-prototype
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request :D