map.updateDeep(props)

Assigns each value in props to a property on this map instance named after the corresponding key in props, effectively merging props into the Map. Properties not in props will be set to undefined.

import {DefineMap, DefineList} from "can";

const MyMap = DefineMap.extend({
  list: DefineList,
  name: "string"
});

const obj = new MyMap({
  list: ["1", "2", "3"],
  name: "bar",
  foo: {
    bar: "zed",
    boo: "goo"
  }
});

obj.updateDeep({
  list: ["first"],
  foo: {
    bar: "abc"
  }
});

console.log( obj.serialize() ); //-> {
//   foo: { bar: "abc" },
//   list: ["first"]
// }
console.log( obj.foo.boo ); //-> undefined
console.log( obj.name ); //-> undefined