map.assign(props)

Each value in props will be assigned to a property on this map instance named after the corresponding key in props, effectively replacing props into the Map. Properties not in props will not be changed. For example:

import {DefineMap, DefineList} from "can";

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

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

obj.assign({
  list: ["first"]
});

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

Note: .assign will not remove or change properties that are not in props. Use .update() to replace all of a map’s values.