2024. 5. 24 map, find, filter, local storage 문제 풀기

const numbers = [1, 2, 3, 4, 5]

const double = numbers.map(number => number * 2);

console.log(double)

const users = [ { name: 'Alice', age: 22 }, { name: 'Bob', age: 24 }, { name: 'Carol', age: 23 } ]

const usersName = users.map(user => user.name);

console.log(usersName);

 

const users = [ { name: 'Alice', age: 30, city: 'Seoul' }, { name: 'Bob', age: 25, city: 'New York' }, { name: 'Charlie', age: 35, city: 'London' } ]

const info = users.map(user => ({name : user.name, city : user.city}));

console.log(info)

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const number = [3, 7, 11, 9, 12, 13]

const tenup = number => number > 10;

const result = number.find(tenup);

console.log(result);

const users =[ { name: 'Alice', age: 30 }, { name: 'Bob', age: 25 }, { name: 'Charlie', age: 35 } ]

const alice = users.find(person => person.name === 'Alice')

console.log(alice)

const data = [ { id: 1, name: 'Laptop' }, { id: 2, name: 'Smartphone' }, { id: 3, name: 'Tablet' } ]

const findId3 = data.find((item) => item.id === 3);

console.log(findId3);

---

const numbers =[1,2,3,4,5,6]

const filters = numbers.filter((abc) => {

    return abc%2 === 0

})

console.log(filters)

const arr = [{ name: 'Alice', age: 25 }, { name: 'Bob', age: 30 }, { name: 'Carol', age: 35 }]

const newArr = arr.filter((user) => {

    return user.age >= 30;

});

console.log(newArr);

const product = [ { name: 'Laptop', price: 1000 }, { name: 'Smartphone', price: 500 }, { name: 'Tablet', price: 250 } ]

const newProduct = product.filter((a) => {

    return a.price >= 500;

})

console.log(newProduct)

---

const arr1 = [1, 2, 3];

const arr2 = [4, 5, 6];

const arr3 = [7, 8, 9];

const allarr = [... arr1, ...arr2, ...arr3]

console.log(allarr)

const obj1 = { name: "Alice", age: 30 };

const obj2 = { job: "Software Engineer", city: "Seoul" };

const one = {...obj1, ...obj2}

console.log(one);

const sum = sumNumbers(...numbers);

console.log(sum);

---

const person = {

    name: "John Doe",

    age: 30,

    occupation: "Software Engineer"

  };

const { name, age, occupation } = person;

console.log(name, age, occupation);

const user = {

    name: "Jane Doe",

    age: 25,

    occupation: "Web Developer",

    address: {

      city: "Seoul",

      country: "South Korea"

    }

  };

  const {address:{city}} = user;

  console.log(city)

const numbers = [1, 2, 3, 4, 5];

const [num1 , num2, ...rest] = numbers;

console.log(rest);

---

localStorage.setItem('username', 'james');

localStorage.setItem('age', 20);

const username = localStorage.getItem('username')

console.log(username)

localStorage.removeItem('username');

localStorage.removeItem('age');

const person = {

    name: 'Bard',

    age: 3,

    occupation: 'Language Model'

  };

  const user = localStorage.setItem('person', JSON.stringify(person));