const mon = "mon";const thu = "thu";const wed = "wed";const thu = "thu";const fri = "fri";const sat = "sat";const sun = "sun";const dayOfWeek = ["mon", "thu", "wed", "thu", "fri", "sat"];console.log(dayOfWeek); // Array(6)// 0: "mon"// 1: "thu"// --- // 5: "sat"// length: 6dayOfWeek.push("sun"); // dayOfWeek의 마지막에 "sun"이라는 변수 값을 추가console.log(dayOfWeek); // Array(7)// 0: "mon"// 1: "thu"// -..

Always const Sometimes let Never var const a = 5;const b = 2;let myName = "eazy";console.log(a + b);console.log(a * b);console.log(a / b);console.log("Hello " + myName);myName = "eazy_to";console.log("My new name is " + myName);