集合同士の処理例

set.js

const _ = require("lodash");

const xs = [
  {
    id: 1,
    name: "John Doe"
  },
  {
    id: 2,
    name: "Jane Doe"
  }
]

const ys = [
  {
    id: 2,
    name: "Jane Duck"
  },
  {
    id: 3,
    name: "Jack Nicholson"
  }
]

console.info(_.differenceBy(xs, ys, "id")); //=> 1
console.info(_.differenceBy(ys, xs, "id")); //=> 3
console.info(_.intersectionBy(xs, ys, "id")); //=> 2
console.info(_.intersectionBy(ys, xs, "id")); //=> 2
console.info(_.unionBy(xs, ys, "id")); //=> 1, 2, 3
console.info(_.unionBy(ys, xs, "id")); //=> 2, 3, 1
console.info(_.xorBy(xs, ys, "id")); //=> 1, 3
console.info(_.xorBy(ys, xs, "id")); //=> 3, 1