Question

(Javascript)

/*
* 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 16 2019 00:00:00 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 4th!`, new Date(`07-04-2019`))
];
// 12
console.log(chirpsByJohn[0].postLength());

// Happy 4th!
// By John Doe on Thu Jul 04 2019 00:00:00 GMT-0400 (Eastern Daylight Time)
console.log(chirpsByJohn[2].printPost());

// true
console.log(chirpsByJohn[0].wasBefore(johnsChirps[1]));

// false
console.log(chirpsByJohn[1].wasBefore(johnsChirps[0]));

Answer 1

/*
* 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 16 2019 00:00:00 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(author, message, date) {
    this.author = author;
    this.message = message;
    this.date = date;

    this.postLength = function () {
        return this.message.length;
    };

    this.printPost = function () {
        console.log(this.message);
        console.log("By " + this.author.name + " on " + this.date.toString());
    };

    this.wasBefore = function (chirp) {
        return this.date < chirp.date;
    }
}

// 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 4th!`, new Date(`07-04-2019`))
];
// 12
console.log(chirpsByJohn[0].postLength());

// Happy 4th!
// By John Doe on Thu Jul 04 2019 00:00:00 GMT-0400 (Eastern Daylight Time)
console.log(chirpsByJohn[2].printPost());

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

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