HackerRank Class vs Instance | JS Solution

Problem

HackerRank detailed problem description can be found here.

Inputs & Outputs

/*
input {number} age
output {string}
*/

Test Case

// Different ages: 4, -1, 10, 16, 18

JavaScript Solution

function Person(initialAge) {
  // Add some more code to run some checks on initialAge
  let age = 0;
  if (initialAge >= 0) {
    age = initialAge;
  } else {
    console.log('Age is not valid, setting age to 0.');
  }
  this.amIOld = function () {
    // Do some computations in here and print out the correct statement to the console
    if (age < 13) {
      console.log('You are young.')
    } else if (age >= 13 && 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
    age++;
  };
}

Resources

1. Class vs. Instance algorithm by HackerRank
2. Classes by MDN Web Docs
3. JavaScript Classes by W3Schools
4. The Secret Life of Objects by Marijn Haverbeke, Eloquent JavaScript