자바스크립트 호이스팅 뜻

참고자료 : 이해하기 쉬운 설명과 예제가 들어있는 사이트.

https://scotch.io/tutorials/understanding-hoisting-in-javascript

 

관련 한글자료

https://webcoding.tistory.com/115

 

Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their scope before code execution. Inevitably, this means that no matter where functions and variables are declared, they are moved to the top of their scope regardless of whether their scope is global or local.

 

This mechanism only moves the declaration. The assignments are left in place.

 

All variable and function declarations are hoisted to the top of their scope.

 

However, in contrast, undeclared variables do not exist until code assigning them is executed. Therefore, assigning a value to an undeclared variable implicitly creates it as a global variable when the assignment is executed. This means that, all undeclared variables are global variables.