Monster shadow

VIDEO

You NEED to know this! - Master debugging in Unity and; C#

Description:
There is nothing exciting about debugging, but it's such a vital tool for any developer. Train your debugging skills now and you'll save an unfathomable amount of hours searching through your code trying to find bugs. ❤️ Become a Tarobro on Patreon: https://www.patreon.com/tarodev ========= 🔔 SUBSCRIBE: https://bit.ly/3eqG1Z6 🗨️ DISCORD: https://discord.gg/GqeHHnhHpz ✅ MORE TUTORIALS: https://www.youtube.com/tarodev
ADD A COMMENT

Anil Solanki
Sir please make unity Android debugging video
Aaron George
Does exactly what I do for debugging and then says “But let’s try not to be noobs for a second” and I gotta say I felt personally attacked. But after this video, that’s the old me. And the new me does indeed love you long time. Thanks so much for these tutorials! They are the perfect collection of content for beginner-intermediate game devs and definitely help to bridge that experience gap!
Jahan Zeb
Love You for this ❤
eGregious Games
I love the way you explain stuff and the quick nature of your videos. Just thought I'd drop a positive comment because your channel is fast becoming invaluable to my learning!
Arc Skye
Damn did not know about moving the arrow to control flow execution, very nice vid
akrotiri
ultra master debugging -> just read exception details, in unity, it shows exactly which line causes the problem, no debugging involved at all JUST READ IT! did i tell you that just read? in case i did not, keep reading exception details. thanks for wasting my 10 minutes, and another 10 for reading comment lines that if anyone knows about this READING magic!
OrwellWasRight
You were right. Now titsless.
Tarodev
I hope you find them sir
James Lavery
Now...where did my tits go?... Nice.
Alex
I hoped for something less basic.
Izzy
9:09 Not a boy, but liked your video anyway, cause I'm a rebel :p Thank you! This was helpful!
Tarodev
Oi! Take that like back. Boys only! Jks, thank you :)
Axel dabee
Hey man, I love your channel, but I wanted to write a negative because the title promises me some extra tips for debugging and shows mainly basics. But man, I didn't know you can drag the debug arrow in VS Code. I've 4 years unity hobby experience and didn't know this. You changed my life mate!!
relentingVids
Super helpful! I definitely learned something new! Thanks!
Larry D
Error messages are usually very descriptive. You just need to learn to look out for the good parts of it. The error message at 1:10 says that the NRE occurred in Shapes.cs:18 that means line 18. And the single place where this could have occurred is when accessing _shapeList and it being null. Debugging is nonetheless an invaluable skill. One extra trick: you can right-click the break points and add an condition under which it will stopp the programm execution there.
Lyrel Gaming
Error messages are actually descriptive and debugging is an awesome skill to have. But the script he used is just for demonstration purposes. He made it intentionally just a few lines of code to demonstrate the debugger power not the actual error cases.
Patrick MacMurchy
Is it possible to do things like..tinker with vector math while in a breakpoint? For example just something like evaluating `Vector3.forward * 5` ?
noobcraft
Finnaly watched this :)
noobcraft
:)
Tarodev
About time!
Larry Pendleton
This is good stuff. I would like to see more of these types of videos. I program and rarely use the debugging tools, but this is a great start for me to change the way I test code. Would be great to see debugging in larger code examples. Thanks
9NecroW9
Ok, dragging the Debug Step genuinely blew my mind :D
Zora
I have never heard of Rada, is that a new IDE?
Tarodev
Can't tell if you're making fun of my Aussie accent or of you've never hears of rider before 😜
MrSingh
Man hats off to you , never stop uploading the videos, love ur channel, best content, looking forward for more content
Uncleared
Just discovered this video! Didn't know about the step bugger and how essential it is till now! Thanks for covering it
SEE ALL COMMENTS


Transcript:

becoming a pro debugger is crucial for productivity and your sanity this is
simple stuff but you'll love me a long time once this video is done
okay so i've got a scene here and i've got these two objects with scripts on
them and there are errors in the code so
let's have a look at the first script shapes
so all this is meant to be doing is taking a shape
it will iterate uh for as many times as our shape count is set and it will just
spawn the shape and then it will add it to this shape list here
so let's see what happens when we press play
the variable shape prefab of shapes has not been assigned now i'm sure you have
seen this a billion times but basically all this ever means in
unity is that you have not filled one of your
uh variables in your scripts in the editor
so we can easily fix that by just sliding that in right there
cool let's press play and see what happens now
all right null reference exception okay so this would be the most common error
uh that unity devs receive and to be honest uh it might even be the most
common error that uh devs in general receive
so let's see how to fix this and by the way
while we're here this is not just read only you can double click this
and it will take you directly to the offending line okay so it is telling us
that something in this function is uh null it's and it's throwing an exception
so what you could do is go in here maybe
and debug log you know uh let's debug log the shape see if the shape is null
or whatever but let's try not be noobs for a second
let's remove this and do it the proper way so
we know that something in this function is throwing an error so what we can do
is create a break point on the first line of this function
now i'm using visual studio but it is exactly the same in vs code and brighter
the only difference is maybe the hotkeys might be a little bit different in
brighter but functionally it works exactly the same
so now that we've got this break point here what this is going to do is unity
is going to execute this code until it hits our break point and then it's going
to stop and let us inspect stuff okay so
to begin debugging we just press this button up here attached to unity if you
don't have this it probably means that you have not installed the tools for
visual studio for unity so go to the unity hub and just add that module
so press the button here or just press f5 and that will start uh in debug mode
now back in unity let's clear this if we press play now
it will now execute our code and stop at our breakpoint
google bananas so now when we're in debug mode we can
actually hover over here and we can see the actual variable uh
settings we can see what they're set to so we can see now we actually have a
prefab set to this shape prefab we can see that our shape count is set to three
cool so what could be null here what's throwing this exception is it our shape
no shape seems to be good is it our shape list
yes it's null we have not initialized our shape list anywhere so let's fix
that let's do it up here before we start actually setting stuff let's say our
shape list is equal to new
list game object cool
so with our breakpoint still selected let's attach to unity again and let's
clear this and then try again so now if we inspect it we'll see that it has
indeed been initialized and it's got a count of zero
now that we have fixed our bug what if you want to continue stepping through
the code to inspect what goes on you can come up to here and press this
little button here step over alternatively you can press f10 now i
highly recommend learning these hotkeys as there are only a handful of these
debugging hotkeys but they make your life so much easier
so let's press f10
and as you can see it goes to the next line and it's indicated by this arrow
here now if we hover over shape list we'll see that one shape has been added
to our shape list and we can actually click this and inspect our list we can
see at index 0 here we've got this shape that was just added
so let's remove this break point here
and as we're at the end of this function here if i press f10
it will actually break out of this function and it will go back up to our
loop and as you can see our i is set to zero but if we jump into this loop now
it will now be one cool so that's how you step through code
one little caveat is that pressing f10 will not actually step into a function
so i'll demonstrate that by
just going pressing f10 going down to this line here which is the function
call here if i press f10 again it will not actually show us what has
happened there it will just execute it and then send is next to the next line
if you want to actually jump into the function or step into the function
you can come up here and press this button here step into
alternatively you can press f11 and it will jump into that function now
now it will happen uh very often that when you're debugging your code or god
forbid somebody else's code you will accidentally jump into a
function that could be like a thousand lines long
and you know that function works and you know the error is not there and you just
want to get the hell out you don't want to press f10 a million times
so what you can do is you can come up here
and press this button step out or press shift 11
and that will step us out of this function and it will allow us to
continue the execution here cool
so i'm done now i know that this script is working um so
i've i've unticked all my break points and now i'll just click continue and
that will just continue the execution like normal and as you can see we have
now fixed our script and it's spawning three cubes
excellent so that's one out of two one out of two so let's disable that
and let's now enable our numbers script cool so let's have a look what
numberscript is doing well we're creating a new variable here
called num and we're setting it to start number whatever this start number
is set into in the editor we're iterating for as many as
iterations is and we're multiplying our number by the multiplier and then we're
coming down here and we're dividing by our divider and then we're printing the
final result so let's see what happens if we press
play infinity uh-huh well that doesn't seem
right so let's set a breakpoint and have a
little looksies press play
all right so number will be zero but after we press f10 we'll see that it
will be set to three because that's what start numbers set to we've got
iterations here for three and we'll say num is three multiplier is five if we
step down it's now being multiplied multiply it again
multiply it again and that's three iterations so on the next one it will go
out and now let me show you a magic trick
all right this will blow your tits off so we're down here right we have just uh
executed our code uh as we've written it but visual studio allows you to actually
grab this break point here and pull it up
and we're basically saying could you please run this section of code again
it's not reversing time because if you inspect our num here it's actually the
the multiplied version of our number so we're actually controlling the flow of
of this code here so this is super handy that if you're stepping through stuff
you may have missed something so you can pull it back up and try it
again also you can actually change variables
on the flyer look at this sorry i'm hovering over num here i can actually
change this let's make this 150. so we've actually changed this
at runtime amazing way to
try different edge cases and not actually set the game up so that these
variables will be these uh perfect things for the edge case you can
actually just change them directly in the editor
so let's go down here again this will be three iterations cool
now down here our number is getting pretty big and our divider is
zero and if you know anything about dividing
by zero you'll know bad things happen and that would explain
why our number is coming out as infinity we know now that our divider so
obviously this was a very uh obvious thing uh but
when you're writing your game algorithms and stuff this will be an invaluable
tool in your tool set and it will save you many many tiers your many mentors so
if we press play now we will see that it does indeed give us a correct answer
excellent so if you learned something or if you liked the video leave a freaking
like boys like the video and uh subscribe as well because i'll be
releasing more of this juicy contents and i'll see you next time
you