# map

#### signature: `map(project: Function, thisArg: any): Observable`

## 각각의 값에 넘겨받은 콜백을 적용합니다.

### 예시

**예시 1: 각각의 숫자에 10을 더합니다**

( [StackBlitz](https://stackblitz.com/edit/typescript-a7bnxb?file=index.ts\&devtoolsheight=100) | [jsBin](http://jsbin.com/padasukano/1/edit?js,console) | [jsFiddle](https://jsfiddle.net/btroncone/yd38awLa/) )

```javascript
// RxJS v6+
import { from } from 'rxjs';
import { map } from 'rxjs/operators';

//(1,2,3,4,5) 발생시킵니다
const source = from([1, 2, 3, 4, 5]);
//각각의 값에 10을 더합니다
const example = source.pipe(map(val => val + 10));
//결과: 11,12,13,14,15
const subscribe = example.subscribe(val => console.log(val));
```

**예시 2: 단일 프로퍼티에 map사용하기**

( [StackBlitz](https://stackblitz.com/edit/typescript-qgpnju?file=index.ts\&devtoolsheight=100) | [jsBin](http://jsbin.com/detozumale/1/edit?js,console) | [jsFiddle](https://jsfiddle.net/btroncone/tdLd5tgc/) )

```javascript
// RxJS v6+
import { from } from 'rxjs';
import { map } from 'rxjs/operators';

// ({name: 'Joe', age: 30}, {name: 'Frank', age: 20},{name: 'Ryan', age: 50}) 를 발생시킵니다
const source = from([
  { name: 'Joe', age: 30 },
  { name: 'Frank', age: 20 },
  { name: 'Ryan', age: 50 }
]);
//name값만 가지고옵니다. 이번 예시에서는 pluck을 사용해도 같은 결과를 만들어낼 수 있습니다.
const example = source.pipe(map(({ name }) => name));
//결과: "Joe","Frank","Ryan"
const subscribe = example.subscribe(val => console.log(val));
```

### 관련된 사용법

* [Alphabet Invasion Game](/learn-rxjs-korean/learn-rxjs/recipes/alphabet-invasion-game.md)
* [Battleship Game](/learn-rxjs-korean/learn-rxjs/recipes/battleship-game.md)
* [Catch The Dot Game](/learn-rxjs-korean/learn-rxjs/recipes/catch-the-dot-game.md)
* [Game Loop](/learn-rxjs-korean/learn-rxjs/recipes/gameloop.md)
* [HTTP Polling](/learn-rxjs-korean/learn-rxjs/recipes/http-polling.md)
* [Lockscreen](/learn-rxjs-korean/learn-rxjs/recipes/lockscreen.md)
* [Memory Game](/learn-rxjs-korean/learn-rxjs/recipes/memory-game.md)
* [Mine Sweeper Game](/learn-rxjs-korean/learn-rxjs/recipes/mine-sweeper-game.md)
* \[Save Indicator]\('../../recipes/save-indicator.md)
* [Smart Counter](/learn-rxjs-korean/learn-rxjs/recipes/smartcounter.md)
* [Space Invaders Game](/learn-rxjs-korean/learn-rxjs/recipes/space-invaders-game.md)
* [Stop Watch](/learn-rxjs-korean/learn-rxjs/recipes/stop-watch.md)
* [Swipe To Refresh](/learn-rxjs-korean/learn-rxjs/recipes/swipe-to-refresh.md)
* [Tetris Game](/learn-rxjs-korean/learn-rxjs/recipes/tetris-game.md)
* [Type Ahead](/learn-rxjs-korean/learn-rxjs/recipes/type-ahead.md)

### 추가 자료

* [map](https://rxjs.dev/api/operators/map) :newspaper: - 공식 문서
* [map vs flatMap](https://egghead.io/lessons/rxjs-rxjs-map-vs-flatmap)

  :video\_camera: - Ben Lesh
* [Transformation operator: map and mapTo](https://egghead.io/lessons/rxjs-transformation-operator-map-and-mapto?course=rxjs-beyond-the-basics-operators-in-depth) :video\_camera: :dollar: - André Staltz
* [Build your own map operator](https://blog.strongbrew.io/build-the-operators-from-rxjs-from-scratch/?lectureId=map#app) :video\_camera: - Kwinten Pisman

> :file\_folder: Source Code: <https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/map.ts>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://junwoo45.gitbook.io/learn-rxjs-korean/learn-rxjs/recipes-1/transformation/map.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.