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justin3737/Redux reducer - add item & remove item

Created July 19, 2016 08:07
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  1. justin3737 created this gist Jul 19, 2016.
    21 changes: 21 additions & 0 deletions Redux reducer - add item & remove item
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,21 @@
    function reducer(state = [], action) {
    switch (action.type) {
    case 'ADD_ATTENDEE':
    // Return a new array with old state and added attendee.
    return [{
    name: action.name,
    color: action.color
    },
    ...state
    ];
    case 'REMOVE_ATTENDEE':
    return [
    // Grab state from begging to index of one to delete
    ...state.slice(0, action.index),
    // Grab state from the one after one we want to delete
    ...state.slice(action.index + 1)
    ];
    default:
    return state;
    }
    };