Filter the elements according to another value

Question

I want to output the number of all questions for each post in ReactJs. For this i created the next code:

Answer 1

const posts = [{
        title: 1,
        id: "123"
    },
    {
        title: 2,
        id: "1234"
    },
    {
        title: 3,
        id: "12345"
    }
]

const questions = [{
        id: 55,
        name: 'question one',
        id_post: 123
    },
    {
        id: 56,
        name: 'question two',
        id_post: 123
    },
    {
        id: 57,
        name: 'question three',
        id_post: 1234
    },
    {
        id: 58,
        name: 'question four',
        id_post: 123
    },

];


posts.map(({id}) => {
  let count = 0
  console.log(questions.filter(({id_post}) => (id_post == id)).length)
  
})