sortObjectByValues

sortObjectByValues.js

import toPairs from 'lodash/fp/toPairs';
import fromPairs from 'lodash/fp/fromPairs';
import sortBy from 'lodash/fp/sortBy';
import flow from 'lodash/fp/flow';

/**
 * Returns the object, sorted by the lexicographical order of its values
 *
 * Equivalent to
 *     _(object).toPairs().sortBy(1).fromPairs().value()
 * but this version benefits from code splitting.
 * Sources :
 *   - https://github.com/lodash/lodash/issues/1459#issuecomment-253969771
 *   - https://medium.com/making-internets/why-using-chain-is-a-mistake-9bc1f80d51ba
 */
export const sortObjectByValues = object =>
  flow(
    toPairs,
    sortBy(1),
    fromPairs
  )(object);


/**
 * Accompanying test
 */
describe('sortObjectByValues', () => {
  it('should sort an object by its values', () => {
    const object = {
      1: 'd',
      2: 'b',
      3: 'c',
      4: 'a',
    };
    expect(sortObjectByValues(object)).toEqual({
      4: 'a',
      2: 'b',
      3: 'c',
      1: 'd',
    });
  });
});