1. Count logged in users,count users having greater than equal to 50 points from the following object. 2.Find people who are MERN stack developer

Question

can anyone please help me in solving this? i am following a github course this a exercise question in it. I am stuck in it. Do we have to use Objects.key(obj) method in solving this question. there are two questions please help me in solving this two

const users = {
  Alex: {
    email: 'alex@alex.com',
    skills: ['HTML', 'CSS', 'JavaScript'],
    age: 20,
    isLoggedIn: false,
    points: 30
  },
  Asab: {
    email: 'asab@asab.com',
    skills: ['HTML', 'CSS', 'JavaScript', 'Redux', 'MongoDB', 'Express', 'React', 'Node'],
    age: 25,
    isLoggedIn: false,
    points: 50
  },
  Brook: {
    email: 'daniel@daniel.com',
    skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux'],
    age: 30,
    isLoggedIn: true,
    points: 50
  },
  Daniel: {
    email: 'daniel@alex.com',
    skills: ['HTML', 'CSS', 'JavaScript', 'Python'],
    age: 20,
    isLoggedIn: false,
    points: 40
  },
  John: {
    email: 'john@john.com',
    skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux', 'Node.js'],
    age: 20,
    isLoggedIn: true,
    points: 50
  },
  Thomas: {
    email: 'thomas@thomas.com',
    skills: ['HTML', 'CSS', 'JavaScript', 'React'],
    age: 20,
    isLoggedIn: false,
    points: 40
  },
  Paul: {
    email: 'paul@paul.com',
    skills: ['HTML', 'CSS', 'JavaScript', 'MongoDB', 'Express', 'React', 'Node'],
    age: 20,
    isLoggedIn: false,
    points: 40
  }
}

Answer 1

Object.values(users).filter(user => user.isLoggedIn).length

Object.values(users).filter(user => user.points >= 50).length

Object.entries(users).filter(([_, user]) => user.skills.includes("MongoDB", "Express", "React", "Node")).map(([name]) => name).join(", ")

I guess it's not the point of an exercise to have somebody else solve it.

Answer 2

Theres few cool array Methods that can be handy here.

1. filter

   users.filter((user)=>user.points > 50).length

2. users.filter((user)=>user.skills.includes("MERN"))

if you meant either one of MERN it's a bit more complicated, you have few ways, look this question

Answer 3

let count = 0
let login = 0
for(user in users)
{
    if(users[user].isLoggedIn)
    {
        login++
    }
    if(users[user].points >= 50)
    {
        count++;
    }
    const skills = users[user].skills
    if (skills.includes("MongoDB", "Express", "React", "Node") ) {
        console.log(`${user} have MERN STACK`)
    }
}
console.log(`${count} users have greater than equal to 50 points`)
console.log(`${login} users logged in`)