A fast, dependency-free state container with easy copy and automagically memoized getters, designed for immutability.
Extra power
Wanna reduce Redux boilerplate? Use it combined with Actionware lib.
Install it
npm i stateware --save
yarn add stateware
Use it
import { createState } from 'stateware'
const initialState = createState({
users: [],
genderFilter: null,
filteredUsers({ users, genderFilter }) {
return users.filter(user => !genderFilter || user.gender === genderFilter);
},
totalPosts({ filteredUsers }) {
return filteredUsers.reduce((sum, user) => sum + user.postsCount, 0);
}
})
// Create a new state, updating 'users' value
const newState = initialState.copy({
users: [
{ name: 'John Doe' , gender: 'M', postsCount: 10 },
{ name: 'Jane Doe' , gender: 'F', postsCount: 5 },
{ name: 'Alan Turing' , gender: 'M', postsCount: 15 },
{ name: 'Ada Lovelace' , gender: 'F', postsCount: 16 }
]
})
// Access state values
newState.users
newState.genderFilter
newState.filteredUsers
newState.totalPostsUsage with Redux
Do this:
switch (action.type) {
case 'SET_GENDER_FILTER':
return state.copy({
genderFilter: action.payload
})
}Instead of:
switch (action.type) {
case 'SET_GENDER_FILTER':
const filter = action.payload
return {
...state,
genderFilter: filter,
filteredUsers: state.users.filter(user => !filter || user.gender === filter)
}
}
License
MIT © Wellington Guimaraes