ShmoopTube

00:03

Here's your extra funky shmoop du jour the kind of funky

00:08

not food that's gone bad punky [Rat smelling wedge of cheese]

00:16

what's the fun in funk which implementation will find K within the

00:21

string array alphabet and turn it into funk and hear your potential answers

00:30

.....here we go alright time to get our hands dirty well [Boy digging up mud]

00:32

we've got a big ol array where each element is a letter of the alphabet and

00:36

we have to dig through it until we find the letter K and turn it into some card [Boy digging up alphabet blocks]

00:41

option one starts with a for loop but where typical loop starts with its

00:45

iterator at zero and works upwards this one starts with the iterator at some

00:49

value alphabet dot length minus one well assuming our alphabet array is 26

00:55

elements long that will make I equal to 25 the loop will terminate when I stops

00:59

being greater than or equal to zero and subtract one from I each time the loop

01:03

cycles well the if statement inside the loop will then check the alphabet array [Finger points to if statement]

01:07

at index I see if it equals the letter K most of the time it won't so the code

01:12

within the if statement won't get executed but on a slight chance that we [Doctor speaking with patient]

01:16

get a positive we create the string fresh and give it a value fun then

01:22

change the value of that K we found to be fun plus K funky clever and on looks

01:27

like option one will work all right let's try option two creates a slightly [Option 2 loop appears]

01:31

more typical loop starting its iterator at zero and working upward until it's no

01:34

longer less than the alphabet arrays length well each time the loop cycles [Loop riding a bicycle]

01:38

the if statement checks to see if we're working with a K NSO gives us the

01:42

strings fresh with the value funky and then uses a substring operation a slice

01:48

off the first K and the KY and replace our K with funk so option two should

01:54

work to some string operations are a lot like slicing that gross little nub off [Person slices end of banana]

01:59

the end of a bananas you know all right so so you've got the springs

02:03

banana and you want to get rid of the B at the beginning in the final a well you

02:07

could substring it with the indices of one and five to swing the knife there [Knife cuts away letters b and a]

02:11

and create a new string well that's exactly what's happening here with funky

02:15

being mutilated to create fun in so many senses of the phrase option three takes

02:20

it another direction using a while loop well here we've been given the iterator

02:26

I with a value of one and while the alphabet element at index I minus 1 is

02:31

not K it adds one to the I and loops again so this will go on over and over

02:37

and over until we get a K which points a while loop will break and we'll finally

02:41

get to move down to changing that array value at index I to funk so a job well

02:45

done let's just print our array to the console and we can admire our handiwork [array printing]

02:50

so oh oh no we didn't change K we changed L instead we must have

02:56

overlooked something and there it is right there in our while loop we're [Man points to while loop]

02:59

checking to see if the string at index I minus 1 is K and when it is we alter a

03:05

different array position entirely I so know option 3 does not work is given

03:11

could we tweak it and fix it sure it would be easy but as the stands now all [Woman tweaking a loop function frame]

03:15

the options 1 & 2 don't fake the funk

Full Transcript