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slice in reducer

By Powerful PelicanPowerful Pelican on May 28, 2021
const immutableReducer = (state = [0, 1, 2, 3, 4, 5], action) => {
  switch (action.type) {
    case "REMOVE_ITEM":
      // don't mutate state here or the tests will fail
      return [
        ...state.slice(0, action.index),
        ...state.slice(action.index + 1, state.length)
      ];
    // or return state.slice(0, action.index).concat(state.slice(action.index + 1, state.length));
    default:
      return state;
  }
};

const removeItem = index => {
  return {
    type: "REMOVE_ITEM",
    index
  };
};

const store = Redux.createStore(immutableReducer);

Source: forum.freecodecamp.org

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