A limited and opinionated deep-merge algorithm for data-only object-literals. Nested objects are copied and merged. Arrays, Maps, Sets as values are replaced by the last value.
import { merge } from "./deep-merge";
const jackSparrow = {
firstName: "Jack",
lastName: "Sparrow",
occupation: "Pirate",
birthday: new Date("2022-08-31T19:00:00Z"),
skills: ["Racketeering", "Heists"],
ship: {
name: "Black Pearl",
cannons: 10,
crew: 1,
harbor: "Sansibar",
},
};
const isCaptain = {
occupation: "Captain",
};
const springCook = {
birthday: new Date("2022-04-01T00:00:00Z"),
skills: ["Cooking"],
};
const hisShip = {
ship: {
name: "Flying Dutchman",
crew: 1111,
},
};
merge(jackSparrow, isCaptain, springCook, hisShip);
// {
// "birthday": new Date(2022-04-01T00:00:00.000Z),
// "firstName": "Jack",
// "lastName": "Sparrow",
// "occupation": "Captain",
// "ship": {
// "cannons": 222,
// "crew": 10,
// "harbor": "Sansibar",
// "name": "Flying Dutchman",
// },
// "skills": [
// "Cooking",
// ],
// }Most library merge functions handle a lot of edge cases that occur if you want to merge anything more complex than a "bag of values". As that is what I mostly need merge-functions for I wanted a leaner and easier to understand version.