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reselect v3.0.0 Release Notes

Release Date: 2017-03-24 // about 7 years ago

  • 🆕 New Features

    🐎 Performance improvements (thanks to @johnhaley81)
    ⚡️ Updated Typescript typings (thanks to everyone who helped)

    💥 Breaking Changes

    🐎 For performance reasons, a selector is now not recalculated if its input is equal by reference (===).

    Example:

    import { createSelector } from 'reselect';const mySelector = createSelector( state =\> state.values.filter(val =\> val \< 5), values =\> { console.log('calling..') return values.reduce((acc, val) =\> acc + val, 0) } )var createSelector = require('./dist/reselect.js').createSelector;const mySelector = createSelector( state =\> state.values.filter(val =\> val \< 5), values =\> { console.log('calling..') return values.reduce((acc, val) =\> acc + val, 0) } )var state1 = {values: [1,2,3,4,5,6,7,8,9]};console.log(mySelector(state1));state1.values = [3,4,5,6,7,8,9];console.log(mySelector(state1));var state2 = {values: [1,2,3,4,5,6,7,8,9]};console.log(mySelector(state2));var state3 = {values: [3,4,5,6,7]};console.log(mySelector(state3));

    Output in v2.5.4:

    calling..
10
calling..
7
calling..
10
calling..
7

    Output in v3.0.0:

    calling..
10
10
calling..
10
calling..
7