The function getTokens -> It grabs whatever string it receives from the user, makes it into lowercase, sorts it out (since it was
not defined in this instance, it will just do an automatic one), filter it according to if it was a string or not, and then split the
string properly in accordance with what it was given. Function mostFrequentWord...most of the code makes sense, it is getting the
previous function getTokens, declaring it as 'words' and then using that to go through a for loop, which is saying that as long as
the variable i does not exceed the maximum length of word then keep increasing and there is also a condition on top of that as well.
The extra condition is that while going through the words, if there are more than 1 word then increase the count of wordFrequency by 1
but if not, then just make the word in the array equal to one. The only problem I see though in this code would be that the person
let wordFrequencie = {}; I thought arrays had to equal []? Using the object.key and the array for the function wordFrequency, they set
those to other variables. Then they set a loop for the variable so that the code knows what the most frequent word will end up being
with it setting the current max key/count to help it.