Grouping With Reduce

group.js

// Given an array of fruits in this format:

// [
//     { food: 'apple', type: 'fruit' }, 
//     { food: 'orange', type: 'fruit' }, 
//     { food: 'carrot', type: 'vegetable' }
// ]

// Let's turn it into an object with this format:
// { 
//      fruit: ['orange', 'apple'], 
//      vegetable: ['carrot'] 
// }

// food is an array full of food objects
// let's group them by "type" and return them
function group(foods) {
    return foods.reduce((acc, curr) => {
        if (!acc[curr.type]) {
            acc[curr.type] = [];
        }
        acc[curr.type].push(curr.food);
        return acc;
    }, {});
}