flight.js ( nice but tricky question to practice and revise)

 /**

* Flight

We are building a simulation for birds. One part of it is to design a

class called Flight, which deals with the flying of birds.

This class has upTime and downTime as the properties.

The class should also have a method named calculateFlight,

which will return the calculated flying time. You need to complete this method.

Here, upTime denotes the time at which a given bird starts flying,

and downTime is the time at which the bird lands somewhere.

You don't need to worry about input/output and object of the class.

The given template will take care of it. Also, it is given the bird will fly in the morning,

and will land before night of the same day.

The input will contain the upTime and downTime, in 24 hr notation as hh:mm (h is hour,

and m is min). You need to calculate the flying time of the given bird (in minutes), as output.

Input

First line contains upTime in the given notation. Second line contains downTime in the given notation.

Output

One Integer denoting the flying time in minutes.

Example

Input1:

10:55

22:55

Output1:

720

Explanation:

Flying time will be 12 hrs = 720 min.

*/

let fs = require("fs");

let data = fs.readFileSync(0, 'utf-8');

let idx = 0;

data = data.split('\n');

function readLine() {

idx++;

return data[idx - 1];

}

// -------- Do NOT edit anything above this line ----------

// Use readLine() for taking input,

//it will read one line of from the input and is stored in string format

class Flight {

constructor(upTime, downTime) {

this.upTime = upTime;

this.downTime = downTime;

}

calculateFlight() {

//write your code here

let up = upTime.split(":")// ["10" "55"]

let uphour = parseInt(up[0])//"10"--> 10

let upmin = parseInt(up[1])//"55"--> 55

let down = downTime.split(":") // ["22" "55"]

let downhour = parseInt(down[0])//"22"-->22

let downmin = parseInt(down[1])//"55"-->55

let totalhours = downhour - uphour// 22-10=>12

let totalmin = downmin - upmin//55-55=>0

let totalflyingtime = totalhours * 60 + totalmin // 12*60+0==>720

return totalflyingtime//720

}

}

// -------- Do NOT edit anything below this line ----------

let upTime = readLine();// 10:55, 10 hours 55 minutes =600+55=> 655 minutes

//console.log(upTime) // 10:55 white color in string format

let downTime = readLine();//22:55, 22 hours 55 minutes =1320+55=>1375 minutes

//console.log(downTime) // 22:55 white color in string format

let NewFlight = new Flight(upTime, downTime); // Invoking the class Flight

console.log(NewFlight.calculateFlight());// Invoking and consoling method calculateFlight

//////////////////////////////////////////////////////////////////////////////////////////////