JavaScript Function 화살표 함수 () => {} vs function () {} const double = function (x) { return x * 2; }; console.log('double: ', double(7)); // 14 const doubleArrow = (x) => x * 2; //const doubleArrow = x => x * 2; () 매개변수가 1개면 생략 가능 console.log('double: ', doubleArrow(7)); // 14 객체를 반환 할 시, ({name: huisu}) IIFE 즉시실행함수 Immdiately-Invoked Function Expression const a = 7; function double() { console.l..