day-4-class-vs-instance.js

process.stdin.resume();
process.stdin.setEncoding('ascii');

let input_stdin = '';
let input_stdin_array = '';
let input_currentline = 0;

process.stdin.on('data', (data) => {
  input_stdin = input_stdin + data;
});

process.stdin.on('end', () => {
  input_stdin_array = input_stdin.split('\n');
  main();
});

function readLine() {
  return input_stdin_array[input_currentline++];
}

function Person(initialAge) {
  // Add some more code to run some checks on initialAge
  if (isNaN(Number(initialAge)) || initialAge < 0) {
    console.log('Age is not valid, setting age to 0.');
    this.age = 0;
  } else {
    this.age = initialAge;
  }

  this.amIOld = function() {
    // Do some computations in here and print out the correct statement to the console
    if (this.age < 13) {
      console.log('You are young.');
    } else if (this.age >= 13 && this.age < 18) {
      console.log('You are a teenager.');
    } else {
      console.log('You are old.');
    }
  };
  this.yearPasses = function() {
    // Increment the age of the person in here
    this.age += 1;
  };
}

function main() {
  let T = parseInt(readLine());
  for (i = 0; i < T; i++) {
    let age = parseInt(readLine());
    let p = new Person(age);
    p.amIOld();
    for (j = 0; j < 3; j++) {
      p.yearPasses();
    }
    p.amIOld();
    console.log('');
  }
}