pluck

signature: pluck(properties: ...args): Observable

값을 발생시킬 프로퍼티를 선택합니다

예시

예시1: 객체 프로퍼티 뽑아내기

( StackBlitz | jsBin | jsFiddle )

// RxJS v6+
import { from } from 'rxjs';
import { pluck } from 'rxjs/operators';

const source = from([{ name: 'Joe', age: 30 }, { name: 'Sarah', age: 35 }]);
//names만 가져옵니다
const example = source.pipe(pluck('name'));
//결과: "Joe", "Sarah"
const subscribe = example.subscribe(val => console.log(val));

예시 2: nested 프로퍼티 뽑아내기

( StackBlitz | jsBin | jsFiddle )

// RxJS v6+
import { from } from 'rxjs';
import { pluck } from 'rxjs/operators';

const source = from([
  { name: 'Joe', age: 30, job: { title: 'Developer', language: 'JavaScript' } },
  //job 값이 없으면 undefined를 반환할 것입니다
  { name: 'Sarah', age: 35 }
]);
//job 안의 title프로퍼티를 뽑아냅니다
const example = source.pipe(pluck('job', 'title'));
//결과: "Developer" , undefined
const subscribe = example.subscribe(val => console.log(val));

관련된 사용법

추가 자료

  • pluck :newspaper: - 공식 문서

:file_folder: Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/pluck.ts

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