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provide-map

Provider factory for ES6 Map instances to be shared across multiple React components.

Table of contents

1. Installation
2. Usage
3. Condensed example (defaults)

• Default actions
• Default reducers

1. Condensed example (custom)

• Custom actions
• Custom reducers

Installation

npm install provide-map --save

Usage

Use provide-map to create providers with predictably named actions and reducers specific to manipulating ES6 Map instances. Create as many providers/instances as you want and share them across multiple components.

The main export provideMap takes 3 arguments:

mapName

defaults to 'map'

itemName

defaults to 'item'

indexName

defaults to 'index'

Condensed example (defaults)

import { render } from 'react-dom';
import provideMap from 'provide-map';
import { GoodStuff } from './components/index';
 
const map = provideMap();
 
const defaultProps = {
  providers: {
    map: {
      ...map,
      state: {
        map: new Map([
          ['a', { fruit: 'apple' }],
          ['b', { fruit: 'banana' }],
          ['c', { vegetable: 'carrot' }]
        ])
      }
    }
  }
};
 
render(<GoodStuff { ...defaultProps } />, document.getElementById('root'));

Components can then use the following default actions and reducers via propTypes.

Default actions

• setMap (Object map) - sets the map
• updateMap (Function update) - updates each key-value pair
• filterMap (Function filter) - filters each key-value pair
• clearMap () - clears the map
• mergeMap (Object map) - update or add new items to the map (shallow merge)
• setItem (Mixed index, Mixed item) - sets the item at some index (note: we're referring to the key as index because this.props.key is reserved for React internally)
• updateItem (Mixed index, Mixed item) - updates or sets the item at some index; if the existing item the update are both objects, it will merge the two as a new object
• deleteItem (Mixed index) - deletes the item at some index

Default reducers

• map - the map instance, of course
• mapSize - the size of the map instance
• item - if the component instance contains a prop key matching the indexName (e.g., index), the item at that key within the map will be provided
• hasItem - if the component instance contains a prop key matching the indexName (e.g., index), the existence of the item at that key within the map will be provided as a boolean value

Condensed example (custom)

import { render } from 'react-dom';
import provideMap from 'provide-map';
import { GoodStuff } from './components/index';
 
const goodMap = provideMap('goodMap', 'goodItem', 'goodIndex');
 
const defaultProps = {
  providers: {
    goodMap: {
      ...goodMap,
      state: {
        goodMap: new Map([
          ['a', { fruit: 'apple' }],
          ['b', { fruit: 'banana' }],
          ['c', { vegetable: 'carrot' }]
        ])
      }
    }
  }
};
 
render(<GoodStuff { ...defaultProps } />, document.getElementById('root'));

Components can then use the following custom actions and reducers via propTypes.

Custom actions

• setMap -> setGoodMap
• updateMap -> updateGoodMap
• filterMap -> filterGoodMap
• clearMap -> clearGoodMap
• mergeMap -> mergeGoodMap
• setItem -> setGoodItem
• updateItem -> updateGoodItem
• deleteItem -> deleteGoodItem

Custom reducers

• map -> goodMap
• mapSize -> goodMapSize
• item -> goodItem
• hasItem -> hasGoodItem