Udacity React Nanodegree appReducer.js

appReducerV1.js

/* Create A Reducer
 *
 * You need to create a reducer called "appReducer" that accepts two arguments:
 * - First, an array containing information about ice cream 
 * - Second, an object with a 'DELETE_FLAVOR' `type` key
 * (i.e., the object contains information to delete the flavor from the state)
 *
 * The action your reducer will receive will look like this:
 * { type: 'DELETE_FLAVOR', flavor: 'Vanilla' }
 *
 * And the initial state will look something like this (as such, refrain 
 * from passing in default values for any parameters!):
 * [{ flavor: 'Chocolate', count: 36 }, { flavor: 'Vanilla', count: 210 }];
*/
function appReducer (state, action){
  if (action.type === 'DELETE_FLAVOR' ){    
    let newState = [];
    state.forEach(function(element){
      if (element.flavor!== action.flavor){
        newState.push(element);
      }
    });
    return newState;
  }
  return state;
}

console.log(
  appReducer([{ flavor: 'Chocolate', count: 36 }, { flavor: 'Vanilla', count: 210 }], { type: 'DELETE_FLAVOR', flavor: 'Vanilla' })
)