작성법만 다르고 3개 함수는 모두 같은 함수입니다
function getRectangleArea(width, height){
let rectanglearea = width * height;
return rectanglearea
}
let getRectangleArea = function (width, height) {
let rectangleArea = width * height;
return rectangleArea
}
let getRectangleArea = (width, height) => {
let rectangleArea = width * height;
return rectangleArea
}
//리턴, 중괄호 생략가능함!
let getRectangleArea = (width, height) => width * height;