使用underscore.js对嵌套数组进行分组

var _ = require('underscore');

var nestedArray = [
  { name: 'Alice', category: 'A' },
  { name: 'Bob', category: 'B' },
  { name: 'Charlie', category: 'A' },
  { name: 'Dave', category: 'B' },
  { name: 'Eve', category: 'C' }
];

var grouped = _.groupBy(nestedArray, function(item) {
  return item.category;
});

console.log(grouped);

{
  A: [
    { name: 'Alice', category: 'A' },
    { name: 'Charlie', category: 'A' }
  ],
  B: [
    { name: 'Bob', category: 'B' },
    { name: 'Dave', category: 'B' }
  ],
  C: [
    { name: 'Eve', category: 'C' }
  ]
}