filtre and co 2

function date(min,max){

  return function( {date} ){

    if (new Date(min) <= new Date(date) && new Date(date) <= new Date(max)) {return true}

    else {return false}

  }

}

const myagg = function(acc, cur)  {

  if (!acc[cur.item]) acc[cur.item] = 0;

  acc[cur.item]+=cur.price*cur.quantity;

  return acc

}

const filtre = products.filter(date('2014-01-01','2015-01-01'))

                       .reduce( myagg,{})

console.log(filtre)

code