import assert from 'assert'

const sortByAge = (source) => source.sort((itemA, itemB) => itemA.age - itemB.age)

const ob = (age) => ({ name: ''+age, age })

assert.deepEqual(
  sortByAge([ ob(1), ob(6), ob(2), ob(5), ob(3), ob(4) ]),
  [ ob(1), ob(2), ob(3), ob(4), ob(5), ob(6) ]
)