Created
October 22, 2018 20:49
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Functional React Article Snippet #4
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| import withState from 'recompose/withState' | |
| import compose from 'recompose/compose' | |
| import withHandlers from 'recompose/withHandlers' | |
| import stringCapitalize from 'somewhere' | |
| const addToSetFactory = (stateName, stateUpdaterName) => props => item => | |
| props[stateUpdaterName](new Set(props[stateName]).add(item)) | |
| const removeFromSetFactory = (stateName, stateUpdaterName) => props => item => | |
| props[stateName].delete(item) && | |
| props[stateUpdaterName](new Set(props[stateName])) | |
| const defaultInitialState = () => new Set() | |
| /** | |
| * Puts a field in the state named stateName, and provides addToStateName | |
| * and removeFromStateName methods to add/remove from the set. | |
| * | |
| * eg: stateName=selectedTags, stateUpdaterName=setSelectedTags | |
| * | |
| * The following props will get added: | |
| * | |
| * selectedTags, setSelectedTags, addToSelectedTags, removeFromSelectedTags | |
| * | |
| */ | |
| export default (stateName, stateUpdaterName, initialState) => | |
| compose( | |
| withState(stateName, stateUpdaterName, initialState || defaultInitialState), | |
| withHandlers({ | |
| ['addTo' + stringCapitalize(stateName)]: addToSetFactory( | |
| stateName, | |
| stateUpdaterName | |
| ), | |
| ['removeFrom' + stringCapitalize(stateName)]: removeFromSetFactory( | |
| stateName, | |
| stateUpdaterName | |
| ), | |
| }) | |
| ) |
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