group-object

Group object keys and values into lists.

Install with npm

$ npm i group-object --save

Usage

var groupBy = require('group-object');

API

groupBy

Create groupings from an object's keys and values.

Params

• obj {Object}: Object to group.
• grouper {Function}: Optional grouping function that takes acc, value, key, obj, setter
• setter {Function}: Optional setter function that takes acc, group, value, key, obj
• acc {Object}: Optional accumulator object passed to the setter function.
• returns {Object}: Object containing groups as keys and list of objects as values in the group.

Example

function grouper (acc, value, key, obj, setter) {
  return value.group;
}

function setter (acc, group, value, key, obj) {
  acc[group] = acc[group] || {};
  acc[group][key] = value;
}

var obj = {
  a: { group: 'one', content: 'A'},
  b: { group: 'one', content: 'B'},
  c: { group: 'two', content: 'C'},
  d: { group: 'two', content: 'D'},
  e: { group: 'three', content: 'E'},
  f: { group: 'three', content: 'F'}
};

var groups = groupBy(obj, grouper, setter);
//=> {
//=>   one: {
//=>     a: { group: 'one', content: 'A'},
//=>     b: { group: 'one', content: 'B'}
//=>   },
//=>   two: {
//=>     c: { group: 'two', content: 'C'},
//=>     d: { group: 'two', content: 'D'}
//=>   },
//=>   three: {
//=>     e: { group: 'three', content: 'E'},
//=>     f: { group: 'three', content: 'F'}
//=>   }
//=> }

Related projects

• for-in: Iterate over the own and inherited enumerable properties of an objecte, and return an object… more
• group-array: Group array of objects into lists.
• get-value: Use property paths ( a.b.c) to get a nested value from an object.
• sort-object: Sort the keys in an object.
• set-value: Create nested values and any intermediaries using dot notation ('a.b.c') paths.
• upsert-value: Update or set nested values and any intermediaries with dot notation ('a.b.c') paths.

Running tests

Install dev dependencies:

$ npm i -d && npm test

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue

Author

Brian Woodward

• github/doowb
• twitter/doowb

License

Copyright © 2015 Brian Woodward Released under the MIT license.

This file was generated by verb-cli on July 19, 2015.