gist2.js

import { of, itShouldProp, large, always } from 'OverAssert'

const data = {
  age: 20
};

of(data)
  .map(itShouldProp('age', large(10), always('age should large than 10')))
  .map(itShouldProp('age', less(80), always('age should less than 80')))
  .validation((success, reason) => {
     // success = true
  })