ExercisesOscar.ts

/* TypeScript Exercises Oscar Arias 09/30/2024 Use: https://www.typescriptlang.org/play/ */ 

const months_of_the_year: { name: string; days: number }[] = [
  { name: "January", days: 31 },
  { name: "February", days: 28 }, // 29 in a leap year
  { name: "March", days: 31 },
  { name: "April", days: 30 },
  { name: "May", days: 31 },
  { name: "June", days: 30 },
  { name: "July", days: 31 },
  { name: "August", days: 31 },
  { name: "September", days: 30 },
  { name: "October", days: 31 },
  { name: "November", days: 30 },
  { name: "December", days: 31 },
];

/* 1. Map Exercise: Extract the numeric portion of the months_of_the_year array and write a function that returns a new array with each number squared. 
      Objective: Assess understanding of the map function. */
const square_numbers = [];
console.log(square_numbers);
/* [LOG]: [961, 784, 961, 900, 961, 900, 961, 961, 900, 961, 900, 961] */


/* 2. Filter Exercise: Extract the string portion of the months_of_the_year array, write a function that returns a new array containing only the strings that have more than 6 characters. 
     Objective: Test knowledge of the filter function.
*/
const long_months = [];
console.log(long_months);
/* [LOG]: ["January", "February", "September", "October", "November", "December"] */



/* ---------------- SOLUTIONS --------------- */
 
const months_of_the_year: { name: string, days: number }[] = [
    { name: "January", days: 31 },
    { name: "February", days: 28 }, // 29 in a leap year
    { name: "March", days: 31 },
    { name: "April", days: 30 },
    { name: "May", days: 31 },
    { name: "June", days: 30 },
    { name: "July", days: 31 },
    { name: "August", days: 31 },
    { name: "September", days: 30 },
    { name: "October", days: 31 },
    { name: "November", days: 30 },
    { name: "December", days: 31 }
];

/* Task: 1 */
if (isCurrentYearLeapYear()){
  months_of_the_year[1].days = 29;
}
const mappedNumbers = months_of_the_year.map(month => month.days ** 2);

/* Task: 2 */
if (isCurrentYearLeapYear()){
  months_of_the_year[1].days = 29;
}
const filterdMonths = months_of_the_year
    .filter(month => month.name.length > 6)
    .map(month => month.name);

console.log(mappedNumbers);
// [961, 784, 961, 900, 961, 900, 961, 961, 900, 961, 900, 961]

console.log(filterdMonths);
// ["January", "February", "September", "October", "November", "December"]



function isCurrentYearLeapYear(): boolean {
    const currentYear = new Date().getFullYear();
    return (currentYear % 4 === 0 && currentYear % 100 !== 0) || (currentYear % 400 === 0);
}