callbackFunction.js

/*Functional Programming: Learn About Functional Programming
Functional programming is a style of programming where solutions are simple, isolated functions, 
without any side effects outside of the function scope.

INPUT -> PROCESS -> OUTPUT

Functional programming is about:

1) Isolated functions - there is no dependence on the state of the program, 
which includes global variables that are subject to change

2) Pure functions - the same input always gives the same output

3) Functions with limited side effects - any changes, or mutations, 
to the state of the program outside the function are carefully controlled*/

/**
 * A long process to prepare tea.
 * @return {string} A cup of tea.
 **/
const prepareTea = () => 'greenTea';

/**
 * Get given number of cups of tea.
 * @param {number} numOfCups Number of required cups of tea.
 * @return {Array<string>} Given amount of tea cups.
 **/
const getTea = (numOfCups) => {
  const teaCups = [];
  
  for(let cups = 1; cups <= numOfCups; cups += 1) {
    const teaCup = prepareTea();
    teaCups.push(teaCup);
  }

  return teaCups;
};

// Add your code below this line

const tea4TeamFCC = getTea(40); // :(

// Add your code above this line

console.log(tea4TeamFCC);