let name = "마정하";
let name = "길동"
name = "철수"
let fruits = []
fruits = ["사과", "바나나", "파인애플"]
fruits.push("사과", "바나나", "파인애플")
let fruits = ["사과", "바나나", "파인애플"]
let newFruits = []
newFruits.push(fruits[fruits.length - 1])
let students = ["철수", "영희", "훈이", "짱구", "유리"]
let qqq = students.slice(0, 2)
let fruits = ["사과", "바나나"]
fruits = ['맛있는' + fruits[0], '맛있는' + fruits[1]]
const number = "01012345678"
let arr = [number.slice(0,3), number.slice(3,7), number.slice(7,12)]
let student = {};
Dot notation
student.name = '철수'
Bracket notation
student['name'] = '철수'
const student = {
name: "철수",
age: 8,
};
const school = {
name: "다람쥐초등학교",
teacher: "다람이",
}
Dot notation
student.school = school
Bracket notation
student['school'] = school
let student = {
name: "철수",
age: 8,
drink: "사이다"
};
delete student.drink;`
const classmates = [
{
name: "철수",
age: 8,
school: "다람쥐초등학교"
},
{
name: "영희",
age: 8,
school: "토끼초등학교"
},
{
name: "짱구",
age: 8,
school: "다람쥐초등학교"
}
];
classmates[1].school = '다람쥐초등학교'
let str = "3"
let number = 3
typeof str
typeof number
let array = []
let object = {}
typeof object
Array.isArray(object)
Array.isArray(array)
let num = 24
let str
str = String(num)
출처: 코드캠프