How to use momentjs to reasonably cleanly format a duration

display-duration.js

// inspired by https://github.com/moment/moment/issues/1048#issuecomment-23998922

const m = require('moment')

const displayDuration = (start, end) => {

  const diff = end.diff(start)
  const hours = end.diff(start, 'hour')

  return hours === 0
    ? m.utc(diff).format('m [mins]')
    : m.utc(diff).format('h [hour' + (hours > 1 ? 's' : '') + ' and] m [mins]')
}

// demo
const start = m() // is the current date/time
const end = m(start).add(13, 'minute')

console.log(displayDuration(start, end))
end.add(60, 'minute')
console.log(displayDuration(start, end))
end.add(2, 'hour')
console.log(displayDuration(start, end))