Re-construct and categorise array

data.js

var data = [
  {price: "$99.99", stocked: true, name: "iPod Touch", category: "Electronics"},
  {price: "$399.99", stocked: false, name: "iPhone 5", category: "Electronics"},
  {price: "$199.99", stocked: true, name: "Nexus 7", category: "Electronics"},
  {price: "$49.99", stocked: true, name: "Football", category: "Sporting Goods"},
  {price: "$9.99", stocked: true, name: "Baseball", category: "Sporting Goods"},
  {price: "$29.99", stocked: false, name: "Basketball", category: "Sporting Goods"}
];

index.js

var productList = [];
var category = {};
var products = [];
var lastCategory = null;

data.map(function(product){
  if (lastCategory !== product.category) {

    // reset array and obj
    if (prods.length) {
      products = [];
      category = {};
    }

    category.name = product.category;
    category.products = products;
    productList.push(category);
    lastCategory = product.category;
  }

  category.products.push(product);
});

//console.log(productList);
return productList;

output.js

// productList

[
  {
    name:"Electronics",
    products:[
      {price:"$99.99", stocked:true, name:"iPod Touch", category:"Electronics"},
      {price:"$399.99", stocked:false, name:"iPhone 5", category:"Electronics"},
      {price:"$199.99", stocked:true, name:"Nexus 7", category:"Electronics"}
    ]
  },
  {
    name:"Sporting Goods",
    products:[
      {price:"$49.99", stocked:true, name:"Football", category:"Sporting Goods"},
      {price:"$9.99", stocked:true, name:"Baseball", category:"Sporting Goods"},
      {price:"$29.99", stocked:false, name:"Basketball", category:"Sporting Goods"}
    ]
  }
]