const people = [
  { age: 20, name: "Pesho" },
  { age: 24, name: "Gosho" },
  { age: 23, name: "Dessy" },
  { age: 24, name: "Gerry" },
];

const group = people.reduce((acc, person)=>{
    const age = person.age
    acc[age] = [person]
    return acc
},{})
console.log(group)


const groupBy = (groupingFn) => {
  const result = (arr) => {
    arr.reduce((acc, person)=>{



      return acc;
    }, {});
  };
  return result;
};
const result = groupBy(() => {});
console.log(result(people));

/*
{
  '20': [
    {
      age: 20,
      name: 'Pesho'
    }
  ],
  '23': [
    {
      age: 23,
      name: 'Dessy'
    }
  ],
  '24': [
    {
      age: 24,
      name: 'Gosho'
    },
    {
      age: 24,
      name: 'Gerry'
    }
  ]
}
*/