// Typescript

export interface CustomArray {
name: string;
rank: number;
}

const arr: CustomArray[] = [
{
  name: 'Name1',
  rank: 1
},
{
  name: 'Name2',
  rank: 2
},
{
  name: 'Name3',
  rank: 3
},
];

export const getSortedArray = (): CustomArray[] => arr.sort(({ rank: rank1 }, { rank: rank2 }) => rank1 - rank2)
export const getAvarageRank = (): number => arr.map(e => e.rank).reduce((a, b)=> a + b) / arr.length;