Modify the attached JavaScript file to implement a function constructor for Chirp. Your implementation should include all of the properties and methods described. At the bottom of the file are sample inputs and outputs to test your implementation. $/*$

$*$ USER HAS ALREADY BEEN IMPLEMENTED FOR YOU:

$*$ User has the following properties:

$*$ name: string

$*$ birthday: Date

$*$

$*$ User has the following method:

$*$ getDayBorn: Returns the day of the week that the user was born

$*$ example: Wednesday

$*/$

function User$($name$,$ birthday$)\{$

this.name $=$ name;

this.birthday $=$ birthday;

this.getDayBorn $=$ function$()\{$

var days $=[`$Sunday$`,`$Monday$`,`$Tuesday$`,$

$`$Wednesday$`,`$Thursday$`,`$Friday$`,`$Saturday$`]$;

return days$[$this$.$birthday.getDay$()]$;

$\}$

$\}$

$/*$

$*$ YOUR TASK IS TO IMPLEMENT CHIRP:

$*$ Chirp has the following properties:

$*$ author: User

$*$ message: string

$*$ date: Date

$*$

$*$ Chirp has the following methods:

$*$ postLength: Returns the length of the message, a number

$*$ example: $155$

$*$

$*$ printPost: Uses console.log to print the message, author name, and date

$*$ example:

$*$ Hello World

$*$ By John Doe on Sat Feb $16201900$:$00$:$00$ GMT$-0500($Eastern Standard Time$)$

$*$

$*$ wasBefore: Accepts a chirp and returns true if the current chirp was posted

$*$ before the provided chirp, else false

$*/$

function Chirp$()\{$

$\}$

$//$ SAMPLE INPUT AND OUTPUT TO VALIDATE YOUR IMPLEMENTATION:

var john $=$ new User$(`$John Doe$`,$ new Date$(`01-30-2000`))$;

var chirpsByJohn $=[$

new Chirp$($john$,`$Hello world!$`,$ new Date$(`02-16-2019`)),$

new Chirp$($john$,`$First day of spring!$`,$ new Date$(`03-20-2019`)),$

new Chirp$($john$,`$Happy $4$th$!`,$ new Date$(`07-04-2019`))$

$]$;

$//12$

console.log$($chirpsByJohn$[0].$postLength$())$;

$//$ Happy $4$th$!$

$//$ By John Doe on Thu Jul $04201900$:$00$:$00$ GMT$-0400($Eastern Daylight Time$)$

chirpsByJohn$[2].$printPost$()$;

$//$ true

console.log$($chirpsByJohn$[0].$wasBefore$($chirpsByJohn$[1]))$;

$//$ false

console.log$($chirpsByJohn$[1].$wasBefore$($chirpsByJohn$[0]))$;