what is going on everybody welcome to part 4 of the go tutorial series in this
part 4 of the go tutorial series in this
part 4 of the go tutorial series in this part what we’re really talking about is
part what we’re really talking about is
part what we’re really talking about is pointers which is pretty much the last
pointers which is pretty much the last
pointers which is pretty much the last element that’s going to be necessary for
element that’s going to be necessary for
element that’s going to be necessary for you to understand the basic kind of go
you to understand the basic kind of go
you to understand the basic kind of go web server example so also if you’re
web server example so also if you’re
web server example so also if you’re like coming from something like Python
like coming from something like Python
like coming from something like Python this is totally foreign to you so so
this is totally foreign to you so so
this is totally foreign to you so so it’s probably a good idea we cover it so
it’s probably a good idea we cover it so
it’s probably a good idea we cover it so the first thing I’m gonna go ahead and
the first thing I’m gonna go ahead and
the first thing I’m gonna go ahead and do is kind of clean up what we’ve got
do is kind of clean up what we’ve got
do is kind of clean up what we’ve got going on here so first of all we’re just
going on here so first of all we’re just
going on here so first of all we’re just gonna be using format so I’ll get rid of
gonna be using format so I’ll get rid of
gonna be using format so I’ll get rid of the parentheses there we’ll clean up
the parentheses there we’ll clean up
the parentheses there we’ll clean up these two functions and I’ll just empty
these two functions and I’ll just empty
these two functions and I’ll just empty out main because we don’t need anything
out main because we don’t need anything
out main because we don’t need anything there
there
there alright so let’s say we have a variable
alright so let’s say we have a variable
alright so let’s say we have a variable and we’re gonna say it’s X colon equals
and we’re gonna say it’s X colon equals
and we’re gonna say it’s X colon equals and we’ll say that if X is equal to 15
and we’ll say that if X is equal to 15
and we’ll say that if X is equal to 15 what type is 15 you should know now now
what type is 15 you should know now now
what type is 15 you should know now now what we can say is a colon equals and
what we can say is a colon equals and
what we can say is a colon equals and that’s going to point to X so the way
that’s going to point to X so the way
that’s going to point to X so the way that we point to something is with the
that we point to something is with the
that we point to something is with the ampersand and then the variable we want
ampersand and then the variable we want
ampersand and then the variable we want to point to so this is gonna wind up
to point to so this is gonna wind up
to point to so this is gonna wind up being the memory address I’ll just write
being the memory address I’ll just write
being the memory address I’ll just write that out and then now let’s go ahead and
that out and then now let’s go ahead and
that out and then now let’s go ahead and format dot print line a just so we can
format dot print line a just so we can
format dot print line a just so we can see what we’re doing so let me bring up
see what we’re doing so let me bring up
see what we’re doing so let me bring up a command line and go run go go boom so
a command line and go run go go boom so
a command line and go run go go boom so that’s actual memory address where the
that’s actual memory address where the
that’s actual memory address where the value for X’s is being stored so now
value for X’s is being stored so now
value for X’s is being stored so now what we can do is like what if we so so
what we can do is like what if we so so
what we can do is like what if we so so basically you if you want to point to
basically you if you want to point to
basically you if you want to point to something use the ampersand but if you
something use the ampersand but if you
something use the ampersand but if you want to read through a memory address
want to read through a memory address
want to read through a memory address you use the asterisk or star so so what
you use the asterisk or star so so what
you use the asterisk or star so so what we could say is format dot print line
we could say is format dot print line
we could say is format dot print line asterisk a save that run that and you
asterisk a save that run that and you
asterisk a save that run that and you see in this case you get 15 because
see in this case you get 15 because
see in this case you get 15 because that’s that’s currently what the value
that’s that’s currently what the value
that’s that’s currently what the value of x is now what if we said asterisk a
of x is now what if we said asterisk a
of x is now what if we said asterisk a equals 5 what what do you think we’ll
equals 5 what what do you think we’ll
equals 5 what what do you think we’ll wind up happening there so let’s go
wind up happening there so let’s go
wind up happening there so let’s go ahead and save that run that whoops we
ahead and save that run that whoops we
ahead and save that run that whoops we didn’t
didn’t
didn’t anything else let’s go ahead and print X
anything else let’s go ahead and print X
anything else let’s go ahead and print X now so format dot for its line X so now
now so format dot for its line X so now
now so format dot for its line X so now X is actually equal to five because it’s
X is actually equal to five because it’s
X is actually equal to five because it’s changed so so now like just just for fun
changed so so now like just just for fun
changed so so now like just just for fun a the reading through of that memory
a the reading through of that memory
a the reading through of that memory address of X so the reading through of
address of X so the reading through of
address of X so the reading through of whatever’s at a equals whatever’s
whatever’s at a equals whatever’s
whatever’s at a equals whatever’s through at a times every through day
through at a times every through day
through at a times every through day that looks fun so what’s gonna be the
that looks fun so what’s gonna be the
that looks fun so what’s gonna be the output there right you should be able to
output there right you should be able to
output there right you should be able to visually look at this and know what’s
visually look at this and know what’s
visually look at this and know what’s what’s gonna say but oh we still need to
what’s gonna say but oh we still need to
what’s gonna say but oh we still need to print it out huh
print it out huh
print it out huh let’s print let’s do format dot print
let’s print let’s do format dot print
let’s print let’s do format dot print line X what happened hey there we go
line X what happened hey there we go
line X what happened hey there we go we’re Matt dot print line X and then
we’re Matt dot print line X and then
we’re Matt dot print line X and then also let’s let’s print out asterisk a
and that’s probably so we’ll save that
and that’s probably so we’ll save that we’ll run that and as you can you
we’ll run that and as you can you
we’ll run that and as you can you probably could have guessed it was going
probably could have guessed it was going
probably could have guessed it was going to be five times five
to be five times five
to be five times five but anyways pretty cool it’s it’s super
but anyways pretty cool it’s it’s super
but anyways pretty cool it’s it’s super simple once you get used to it but it as
simple once you get used to it but it as
simple once you get used to it but it as a foreign concept it gets kind of
a foreign concept it gets kind of
a foreign concept it gets kind of challenging just know that anytime
challenging just know that anytime
challenging just know that anytime you’ve got ampersand that’s the memory
you’ve got ampersand that’s the memory
you’ve got ampersand that’s the memory address that’s leading to whatever
address that’s leading to whatever
address that’s leading to whatever variable you pass and then if you want
variable you pass and then if you want
variable you pass and then if you want to read what’s at that variable or
to read what’s at that variable or
to read what’s at that variable or what’s at that memory address rather
what’s at that memory address rather
what’s at that memory address rather you’re gonna use the asterisk alright so
you’re gonna use the asterisk alright so
you’re gonna use the asterisk alright so that’s all for pointers and in the next
that’s all for pointers and in the next
that’s all for pointers and in the next tutorial we’ll actually start with our
tutorial we’ll actually start with our
tutorial we’ll actually start with our super basic web server example if you
super basic web server example if you
super basic web server example if you have questions comments concerns
have questions comments concerns
have questions comments concerns whatever you can feel free to leave them
whatever you can feel free to leave them
whatever you can feel free to leave them below otherwise I will see you in the
below otherwise I will see you in the
below otherwise I will see you in the next tutorial
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