Create new object from existing object with new values Angular / Ionic 3

Question

I am working on an Ionic 3 project,which uses Angular.

I have a JSON object like below called person. However, I have a Ionic toggle button which enables various sections based on whats returned from person.

person  = { name: "peter", job: "programmer", home: "somewhere"};

person_checked_values = {}

In order to update my toggles I need to pass a boolean. The keys are the same. How can I dynamically build a new object off of whats returned from person KEYs , but set the value as true so person_checked_values results like below?

person_checked_values  = { name: true, job: true, home: true};

I tried to foreach loop person and create a new object from that, but keep getting undefined and stumped. FWIW - I am using _lodash as well so if there is possibly someway to use help from that library its available.

Answer 1

You can use Object.keys to get all of the keys. You can then combine that with the .reduce function of arrays to build an object.

 let person = { name: "peter", job: "programmer", home: "somewhere" }; let result = Object.keys(person).reduce((obj, key) => { obj[key] = true; return obj; }, {}) console.log(result);