Overview

Here is an example showing how to use backup to save values, restore to restore them, and isDirty to check if the Map has changed:

import DefineMap from "can-define/map/map";
import defineBackup from "can-define-backup";

const recipe = new DefineMap( {
    title: "Pancake Mix",
    yields: "3 batches",
    ingredients: [ {
        ingredient: "flour",
        quantity: "6 cups"
    }, {
        ingredient: "baking soda",
        quantity: "1 1/2 teaspoons"
    }, {
        ingredient: "baking powder",
        quantity: "3 teaspoons"
    }, {
        ingredient: "salt",
        quantity: "1 tablespoon"
    }, {
        ingredient: "sugar",
        quantity: "2 tablespoons"
    } ]
} );
defineBackup(recipe);
recipe.backup();

recipe.title = "Flapjack Mix";
recipe.title;     // "Flapjack Mix"
recipe.isDirty(); // true

recipe.restore();
recipe.title;     // "Pancake Mix"