has()
메서드는 주어진 키를 가진 요소가 Map
에 존재하는지를 반환합니다.
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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 (ECMA-262) The definition of 'Map.prototype.has' in that specification. |
Living Standard |
브라우저 호환성
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