I can't get to solve this exercise

The called function receives as an argument an object 'guests', in the object we have objects that represent the guests at a party where they all have an "age" property. You must return the number of guests who are under 18

In the following example it should return 2

I tried to solve it in several ways, at the moment it goes like this:

function howManyMinors(guest) {
    let guests = {
    Luna: {age: 25},
    Sebastian: {age: 7},
    Mark: {age: 34},
    Nick: {age: 15}
    };
      
    var minors = 0;
    for(element in guests) {
        if(Object.values(guests) <= 18) {
            minors   ;
        }
    }
    return minors;
}

CodePudding user response：

You aren't using the incoming parameter. There is no need to define an internal object inside of the function.

To compute the number of guests who are under 18, I would do something like:

function howManyMinors(guests) {
let minors = 0;
  for (const guest of Object.values(guests)) {
    if (guest.age < 18) minors  ;
  }
  return minors;
}

howManyMinors({
    Luna: {age: 25},
    Sebastian: {age: 7},
    Mark: {age: 34},
    Nick: {age: 15}
}); // 2

CodePudding user response：

In this specific case, there is a better tool for the job which is Array#filter:

function howManyMinors(guests) {
  return Object.values(guests).filter(guest => guest.age < 18).length;
}
const guests ={ Luna: { age: 25 }, Sebastian: { age: 7 }, Mark: { age: 34 }, Nick: { age: 15 } }
console.log(howManyMinors(guests)) // 2

CodePudding user response：

The code you attached is not clear. For example, you don't use the guest argument at all. If I understand you right, you have an object that each property of it represents a guest. Each guest is an object with an age property and your job is to count the guests with age <= 18.

If I understood you correctly, you can do something like this:

const guests = {Luna: {age: 25},
    Sebastian: {age: 7},
    Mark: {age: 34},
    Nick: {age: 15}};

const count = Object.values(guests).reduce((count, value) => value.age <= 18 ? count   1 : count, 0);

console.log(count);