TypeError: "x" has no properties

메세지

TypeError: Cannot read properties of undefined (reading 'x') (V8-based)
TypeError: null has no properties (Firefox)
TypeError: undefined has no properties (Firefox)
TypeError: undefined is not an object (evaluating 'undefined.x') (Safari)

에러 타입

TypeError.

무엇이 잘못되었을까?

null 과 undefined 에 접근 할 수 있는 속성이 없습니다.

예제

null and undefined have no properties

null.foo;
// TypeError: null has no properties

undefined.bar;
// TypeError: undefined has no properties

참조

• null
• undefined