develog

let block scope 재정의 가능 var x = 10; console.log(x); { let x = 20; x = 30; console.log(x); } console.log(x); /* console 10 30 10 */ const block scope 재정의 불가 var x = 10; console.log(x); { const x = 20; x = 30; console.log(x); } console.log(x); /* console 10 Uncaught TypeError: Assignment to constant variable. */ arrow function var x = (a, b) => a + b; console.log(x(1, 2)); // 3 for/of loop var list..