compose function

const compose = (...fns) => (arg) => fns.reduce((composed, f) => f(composed), arg)
const oneSecond = () => 1000
const getCurrentTime = () => new Date()
const clear = () => { console.clear() }
const log = (message) => { console.log(message) }

const serializeClockTime = date => ({
  hours: date.getHours(),
  minutes: date.getMinutes(),
  seconds: date.getSeconds()
})

const civilianHours = clockTime => Object.assign({}, clockTime, { hours: clockTime.hours > 12 ? clockTime.hours - 12 : clockTime.hours }) 
const appendAMPM = clockTime => Object.assign({}, clockTime, {ampm: clockTime.hours >= 12? 'PM': 'AM'})
const display = target => time => { target(time) }
const formatClock = format => time => format.replace('hh',time.hours).replace('mm', time.minutes).replace('ss', time.seconds).replace('tt', time.ampm)
const convertToCivilianTime = clockTime => compose(
	appendAMPM,
  	civilianHours
)(clockTime)

const startTicking = () => setInterval( compose( clear,
           					 getCurrentTime,
						 serializeClockTime,
						 convertToCivilianTime,
						 formatClock('hh:mm:ss:tt'),
                                                 display(log)
                                               ), 
					       oneSecond()
			              )
startTicking()