v1.0.0-alpha

Breaking Changes

createSelectorCreator takes a user specified memoize function instead of a custom valueEqualsFunc.

Before

import { isEqual } from 'lodash';
import { createSelectorCreator } from 'reselect';

const deepEqualsSelectorCreator = createSelectorCreator(isEqual);

After

import { isEqual } from 'lodash';
import { createSelectorCreator, defaultMemoize } from 'reselect';

const deepEqualsSelectorCreator = createSelectorCreator(
  defaultMemoize,
  isEqual
);

New features

Variadic Dependencies

Selector creators can receive a variadic number of dependencies as well as an array of dependencies.

Before

const selector = createSelector(
  [state => state.a, state => state.b],
  (a, b) => a * b
);

After

const selector = createSelector(
  state => state.a,
  state => state.b,
  (a, b) => a * b
);

Access ownProps in Selector

Selector dependencies can receive a variadic number of parameters allowing a selector to receive ownProps passed from mapToProps in connect.

const selector = createSelector(
  (state) => state.a,
  (state, props) => state.b * props.c,
  (_, props) => props.d,
  (a, bc, d) => a + bc + d
);

Configurable Memoize Function

import { createSelectorCreator } from 'reselect';
import memoize from 'lodash.memoize';

let called = 0;
const customSelectorCreator = createSelectorCreator(memoize, JSON.stringify);
const selector = customSelectorCreator(
  state => state.a,
  state => state.b,
  (a, b) => {
    called++;
    return a + b;
  }
);
assert.equal(selector({a: 1, b: 2}), 3);
assert.equal(selector({a: 1, b: 2}), 3);
assert.equal(called, 1);
assert.equal(selector({a: 2, b: 3}), 5);
assert.equal(called, 2);