pluck
New to transformation operators? Check out the article Get started transforming streams with map, pluck, and mapTo!
Example 1: Pluck object property
// RxJS v6+
import { from } from 'rxjs';
import { pluck } from 'rxjs/operators';
const source = from([
{ name: 'Joe', age: 30 },
{ name: 'Sarah', age: 35 }
]);
//grab names
const example = source.pipe(pluck('name'));
//output: "Joe", "Sarah"
const subscribe = example.subscribe(val => console.log(val));
Example 2: Pluck nested properties
// RxJS v6+
import { from } from 'rxjs';
import { pluck } from 'rxjs/operators';
const source = from([
{ name: 'Joe', age: 30, job: { title: 'Developer', language: 'JavaScript' } },
//will return undefined when no job is found
{ name: 'Sarah', age: 35 }
]);
//grab title property under job
const example = source.pipe(pluck('job', 'title'));
//output: "Developer" , undefined
const subscribe = example.subscribe(val => console.log(val));
Last modified 3yr ago