Map.prototype.has()

has() 메서드는 주어진 키를 가진 요소가 Map에 존재하는지를 반환합니다.

구문

myMap.has(key);

매개변수

key
존재 여부를 판별할 키값.

반환 값

주어진 키를 가진 요소가 있으면 true, 아니면 false.

예제

has() 사용하기

var myMap = new Map();
myMap.set('bar', "foo");

myMap.has('bar');  // returns true
myMap.has('baz');  // returns false

명세

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Map.prototype.has' in that specification.
Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'Map.prototype.has' in that specification.
Draft  

브라우저 호환성

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
hasChrome Full support 38Edge Full support 12Firefox Full support 13IE Full support 11Opera Full support 25Safari Full support 8WebView Android Full support 38Chrome Android Full support 38Firefox Android Full support 14Opera Android Full support 25Safari iOS Full support 8Samsung Internet Android Full support Yesnodejs Full support Yes

Legend

Full support  
Full support

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