1. Number
2. String
console.log(5+2); //7
console.log(5*2); //10
console.log(5/2); //2.5
//만약 값을 변경하고싶다면?
const a = 5;
const b = 2;
// constant인 variables를 만듬
console.log(a+b); //7
console.log(a*b); //10
console.log(a/b); //2.5
const myName = "nico"
console.log("hello" + myName); // hello nico
const a = 5;
const b = 2;
let myName = "nico"
console.log(a+b); //7
console.log(a*b); //10
console.log(a/b); //2.5
console.log("hello" + myName); // hello nico
myName = "nicolas" // let은 값을 생성할때 사용하기때문에 다시 사용하지 않는다
console.log("your new name is" + myName);
const amIFat = true;
console.log(amIFat); //true
const amIFat = null;
console.log(amIFat); //
let something;
console.log(something); // undefined
//const mon ="mon";
//const tue ="tue";
//const wed ="wed";
//const thu ="thu";
//const fri ="fir";
//const sat ="sat";
//const sun ="sun";
// const dayOfWeek = mon + tue + wed + thu + fri + sat + sun;// ❌
console.log(dayOfWeek); //montuewedthufrisatsun;
const dayOfWeek = ["mon", "tue", "wed", "thu", "fri", "sat"]
console.log(dayOfWeek);//(6) ["mon", "tue", "wed", "thu", "fri", "sat"]
// Get Item from Array
console.log(dayOfWeek[4]) //"fri" 인덱스는 0부터 시작한다.
// Add one more day to the Array
dayOfWeek.push("sun")
console.log(dayOfWeek);//(7) ["mon", "tue", "wed", "thu", "fri", "sat", "sun"]
const playerName = "nico"
const playerPoints =1212112
const playerHandsome =true;
const playerFat = "little bit"
// 모든 property의 이름을 지어야함
const player = ["nico", 1212, false, "little bit"];// 어떤 의미인지 알 수없음
const player = {
name: "nico",
points: 10,
fat: true,
}
console.log(player); // {name= "nico", points = 10, fat =true}
console.log(player.name); // nico
console.log(player["name"]); // nico
// property의 내용 변경
player.fat = false;
console.log(player); // {name= "nico", points = 10, fat =fales}
// property 추가
player.lastName ="potato"
console.log(player); // {name= "nico", points = 10, fat =fales, lastName ="potato"}