Frontend masters algorithm course exercise.

Frontend Masters Algo exercise.js

// Task 1: Write a function, times10, that takes an argument, n, and multiples n times 10
// a simple multiplication fn
const times10 = (n) => {
  return n * 10
};

console.log('~~~~~~~~~~~~~~TASK 1~~~~~~~~~~~~~~');
console.log('times10 returns:', times10(9));

// Task 2: Use an object to cache the results of your times10 function. 
// protip 1: Create a function that checks if the value for n has been calculated before.
// protip 2: If the value for n has not been calculated, calculate and then save the result in the cache object.

const cache = {};

const memoTimes10 = (n) => {
  if (n in cache) {
    console.log("Fetching from cache")
    return cache[n]
  } else {
    console.log("Not in cache, calculating values.")
    let result = times10(n)
    cache[n] = result
    return result
  }
}

console.log('~~~~~~~~~~~~~~TASK 2~~~~~~~~~~~~~~');
console.log('Task 2 calculated value:', memoTimes10(9));	// calculated
console.log('Task 2 cached value:', memoTimes10(9));	// cached