import { from } from 'rxjs';
import { map } from 'rxjs/operators';
//emit ({name: 'Joe', age: 30}, {name: 'Frank', age: 20},{name: 'Ryan', age: 50})
{ name: 'Joe', age: 30 },
{ name: 'Frank', age: 20 },
{ name: 'Ryan', age: 50 }
//grab each persons name, could also use pluck for this scenario
const example = source.pipe(map(({ name }) => name));
//output: "Joe","Frank","Ryan"
const subscribe = example.subscribe(val => console.log(val));