Heads up! To view this whole video, sign in with your Courses account or enroll in your free 7-day trial. Sign In Enroll
Preview
Start a free Courses trial
to watch this video
You can put loops inside of other loops to create combinations and cross products.
Workspace Snapshots
Related Discussions
Have questions about this video? Start a discussion with the community and Treehouse staff.
Sign upRelated Discussions
Have questions about this video? Start a discussion with the community and Treehouse staff.
Sign up
All right, it's hot out there
let's do an ice cream example.
0:00
For those of you watching at home, you
probably don't know about this place, but
0:04
there is a place here in Portland that
likes to make weird ice cream flavors, and
0:07
it mixes sweet and savory, and
it's a good combination and so
0:10
I thought this might be a good time.
0:14
It's hot outside, it's really hot today,
so let's go make some ice cream
0:15
[INAUDIBLE] you guys [INAUDIBLE] you guys
know this song right come on [LAUGH] Okay,
0:19
so, I have two arrays.
0:24
I have a sweet flavor and I have a savory
flavor and these are actually real.
0:27
They really do have barbecue sauce and
they really do have baked beans.
0:31
So, what we're going to do is we're
going to mix these two together.
0:35
And we're going to do that
through nesting two for loops.
0:39
So let's go ahead and we'll say,
we're gonna use the for each loop here.
0:42
For each of the sweets, the sweet flavors.
0:46
And then we want every single one of
the sweet ones to mix with the other ones.
0:50
We wanna see all the possible combinations
that we can make with this so
0:53
we're gonna nest the loop.
0:56
So, another for loop.
0:57
So each time, each one of these we're
gonna run another one of these loops.
0:59
You see this quite a bit, and
sometimes it's using the Is and the Js.
1:01
I keep on pressing tab, I've been moved
into the IDE world in writing these
1:06
courses and I've been pressing tab.
1:10
Say %s and %s.
1:15
And we're going to pass in the sweet and
we're going to pass in the savory.
1:18
Okay.
So let's run it and
1:24
then we'll take a look at,
we'll walk it really quick.
1:25
Love that I have a java ice cream.
1:32
Alright.
1:35
Okay, so this is the one that popped
out here, this very last one here.
1:39
This is the barbecue sauce.
1:44
And let's see if I can
make this actually longer.
1:46
Let's see the whole thing.
1:48
And I'll bring the loop back down.
1:52
Nope, all right, so alright, so
1:53
caramel is the first sweet flavor.
1:58
So what's gonna happen is it's
gonna go into this for loop and
2:03
sweet is gonna be set to caramel.
2:05
Next, we're gonna loop through
each one of the savory ones but
2:09
we're gonna keep sweet
because it's in the top loop.
2:11
And then in the inside loop
we're gonna hit savory.
2:13
Does that make sense?
2:17
It happens quite a bit when you need
to do cross-products of things and
2:18
combinations of,
you want to loop through all of these and
2:21
see what happens if you do
a combination with all of these things.
2:24
So it's a nested for loop.
2:27
I just wanted to show you that
cause you will see those.
2:28
You need to sign up for Treehouse in order to download course files.
Sign upYou need to sign up for Treehouse in order to set up Workspace
Sign up