# 1급 객체란?

1급 객체(first-class object)의 조건 3가지를 다 충족한다면 1급 객체라고 할 수 있다. 

1. 변수나 데이타에 할당 할 수 있어야 한다.
2. 객체의 인자로 넘길 수 있어야 한다.
3. 객체의 `return` 값으로 `return` 할 수 있어야 한다.

`function`은 1급 객체이다. 


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