Array of Objects.

Sixth class. A budget is a list of records — an array of objects:

const items = [ { category: "food", amount: 12 }, { category: "rent", amount: 40 }, ];

items.length is the record count. Later we will filter and find by category.

Mini example:

console.log([{ amount: 1 }, { amount: 2 }].length);

Common mistake: commas between fields inside an object, but a missing comma between objects in the array.