- first class
값으로 사용이 가능한
- 변수에 저장이 가능하다
- 매개 변수로 넘길 수 있다
- 함수에서 리턴할 수 있다
- 더 나아가 first class function란?
- 런타임에 아무때나 선언할 수 있다
var f = active ? function fn() { return 1; } : void 0; - 익명으로 선언할 수 있다
(() => { console.log('logging...') })(); - 익명으로 선언한 함수를 매개변수로(값으로 취급이 가능하단) 넘길 수 있다
f((v) => v + 1);
- 런타임에 아무때나 선언할 수 있다
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