what’s going on everybody welcome to part 14 of our to go language to real
part 14 of our to go language to real
part 14 of our to go language to real series in this tutorial what we’re going
series in this tutorial what we’re going
series in this tutorial what we’re going to be talking about is the basics of
to be talking about is the basics of
to be talking about is the basics of Maps so in the go programming language
Maps so in the go programming language
Maps so in the go programming language if you want to store something in the
if you want to store something in the
if you want to store something in the sort of you know key and values system
sort of you know key and values system
sort of you know key and values system the way that you’re gonna do that is
the way that you’re gonna do that is
the way that you’re gonna do that is with maps so let’s just go over some
with maps so let’s just go over some
with maps so let’s just go over some basic examples this should be a pretty
basic examples this should be a pretty
basic examples this should be a pretty quick tutorial and then we’ll actually
quick tutorial and then we’ll actually
quick tutorial and then we’ll actually apply it to a real use case in the next
apply it to a real use case in the next
apply it to a real use case in the next tutorial with our news aggregator web
tutorial with our news aggregator web
tutorial with our news aggregator web app so to begin let’s just start we’re
app so to begin let’s just start we’re
app so to begin let’s just start we’re just gonna have a fresh script here just
just gonna have a fresh script here just
just gonna have a fresh script here just because it should be pretty simple I’m
because it should be pretty simple I’m
because it should be pretty simple I’m gonna go ahead and import and actually
gonna go ahead and import and actually
gonna go ahead and import and actually we’re just gonna use format so I’ll just
we’re just gonna use format so I’ll just
we’re just gonna use format so I’ll just import format also yeah let’s – let’s
import format also yeah let’s – let’s
import format also yeah let’s – let’s just do func main and then we’ll just do
just do func main and then we’ll just do
just do func main and then we’ll just do everything in here so a typical map is
everything in here so a typical map is
everything in here so a typical map is gonna be defined like so so like you
gonna be defined like so so like you
gonna be defined like so so like you could say var grades or something like
could say var grades or something like
could say var grades or something like that and then map and then this will be
that and then map and then this will be
that and then map and then this will be a map containing basically strings or
a map containing basically strings or
a map containing basically strings or basically it’ll be a string key and then
basically it’ll be a string key and then
basically it’ll be a string key and then the value will be float32
the value will be float32
the value will be float32 okay for example so and actually in our
okay for example so and actually in our
okay for example so and actually in our case well we’ll go with float 32 that’s
case well we’ll go with float 32 that’s
case well we’ll go with float 32 that’s fine I’m probably gonna make floats but
fine I’m probably gonna make floats but
fine I’m probably gonna make floats but anyway so this would be a grades map
anyway so this would be a grades map
anyway so this would be a grades map right so in theory you know you might
right so in theory you know you might
right so in theory you know you might have students names to their grades in
have students names to their grades in
have students names to their grades in your class okay so now obviously we
your class okay so now obviously we
your class okay so now obviously we don’t need this since we’re inside of a
don’t need this since we’re inside of a
don’t need this since we’re inside of a function so you’d probably have
function so you’d probably have
function so you’d probably have something more along the lines of grades
something more along the lines of grades
something more along the lines of grades colon equals but also a map is just a
colon equals but also a map is just a
colon equals but also a map is just a reference type so it actually doesn’t
reference type so it actually doesn’t
reference type so it actually doesn’t have any values or anything like that if
have any values or anything like that if
have any values or anything like that if you want to have it have values you need
you want to have it have values you need
you want to have it have values you need to use goes make so you’re just going to
to use goes make so you’re just going to
to use goes make so you’re just going to encase this in make and that’s actually
encase this in make and that’s actually
encase this in make and that’s actually gonna go ahead and initialize it for you
gonna go ahead and initialize it for you
gonna go ahead and initialize it for you and all that and then what we can do is
and all that and then what we can do is
and all that and then what we can do is start to actually add values to it and
start to actually add values to it and
start to actually add values to it and get values from and all that fun stuff
get values from and all that fun stuff
get values from and all that fun stuff so let’s go ahead now that that’s done
so let’s go ahead now that that’s done
so let’s go ahead now that that’s done what we can do is we can start adding
what we can do is we can start adding
what we can do is we can start adding things and it’s just like a Python
things and it’s just like a Python
things and it’s just like a Python dictionary so
dictionary so
dictionary so basically the way that you do that is
basically the way that you do that is
basically the way that you do that is you just say grades and then don’t
you just say grades and then don’t
you just say grades and then don’t forget to do double quotes I always want
forget to do double quotes I always want
forget to do double quotes I always want to do single close Timmy and yes that’s
to do single close Timmy and yes that’s
to do single close Timmy and yes that’s his real name it’s like you know how
his real name it’s like you know how
his real name it’s like you know how hipsters are doing it these days it’s
hipsters are doing it these days it’s
hipsters are doing it these days it’s like they’re given like nicknames real
like they’re given like nicknames real
like they’re given like nicknames real names so anyways yeah Timmy I don’t know
names so anyways yeah Timmy I don’t know
names so anyways yeah Timmy I don’t know not my kid anyways he got 42 and guess
not my kid anyways he got 42 and guess
not my kid anyways he got 42 and guess that nickname didn’t help him very much
that nickname didn’t help him very much
that nickname didn’t help him very much in school and then let’s go ahead and
in school and then let’s go ahead and
in school and then let’s go ahead and give a few more we’re gonna do Jess
give a few more we’re gonna do Jess
give a few more we’re gonna do Jess again what’s going on here anyway Jess
again what’s going on here anyway Jess
again what’s going on here anyway Jess got 92 so good good for Jess and then
got 92 so good good for Jess and then
got 92 so good good for Jess and then finally let’s just add one more and then
finally let’s just add one more and then
finally let’s just add one more and then let’s say this is Sam and Sam got a 67
let’s say this is Sam and Sam got a 67
let’s say this is Sam and Sam got a 67 okay so we have that and then now what
okay so we have that and then now what
okay so we have that and then now what we can do is format dot print line we
we can do is format dot print line we
we can do is format dot print line we can just we can print all of grades so
can just we can print all of grades so
can just we can print all of grades so I’ll just go ahead and save that and
I’ll just go ahead and save that and
I’ll just go ahead and save that and then we’ll bring this up go run go touch
then we’ll bring this up go run go touch
then we’ll bring this up go run go touch go cool so as you can see here that’s
go cool so as you can see here that’s
go cool so as you can see here that’s just the full map and now generally
just the full map and now generally
just the full map and now generally you’re probably gonna like print out
you’re probably gonna like print out
you’re probably gonna like print out your whole map but you can if you want
your whole map but you can if you want
your whole map but you can if you want also what we can do is we can begin to
also what we can do is we can begin to
also what we can do is we can begin to like we can take values and assign them
like we can take values and assign them
like we can take values and assign them to specific variables so we could say
to specific variables so we could say
to specific variables so we could say like I don’t know Tim’s grade oh you
like I don’t know Tim’s grade oh you
like I don’t know Tim’s grade oh you know what we should probably do it this
know what we should probably do it this
know what we should probably do it this way Tim’s Tim’s grade people are getting
way Tim’s Tim’s grade people are getting
way Tim’s Tim’s grade people are getting angry so so we found that the style gods
angry so so we found that the style gods
angry so so we found that the style gods from my tutorials so some people were
from my tutorials so some people were
from my tutorials so some people were pointing out first of all like these
pointing out first of all like these
pointing out first of all like these this would be you know your styles for
this would be you know your styles for
this would be you know your styles for Python if you’re gonna give a variable
Python if you’re gonna give a variable
Python if you’re gonna give a variable but in go first of all you probably
but in go first of all you probably
but in go first of all you probably wanna capitalized exported most likely
wanna capitalized exported most likely
wanna capitalized exported most likely and then yeah do like basically title
and then yeah do like basically title
and then yeah do like basically title casing yeah cool also just for the
casing yeah cool also just for the
casing yeah cool also just for the record you can also do go format so go
record you can also do go format so go
record you can also do go format so go fmt and then your actual scripts and
fmt and then your actual scripts and
fmt and then your actual scripts and then basically what this will do is
then basically what this will do is
then basically what this will do is it’ll kind of like fix all your all your
it’ll kind of like fix all your all your
it’ll kind of like fix all your all your style mistakes for you so if you’re if
style mistakes for you so if you’re if
style mistakes for you so if you’re if you’re not if you’re someone like me who
you’re not if you’re someone like me who
you’re not if you’re someone like me who doesn’t really pay much attention to it
doesn’t really pay much attention to it
doesn’t really pay much attention to it maybe that’s your new best friend I
maybe that’s your new best friend I
maybe that’s your new best friend I don’t know anyway back to the tutorial
don’t know anyway back to the tutorial
don’t know anyway back to the tutorial oh sorry
oh sorry
oh sorry Tim’s grade colon equals grades
Tim’s grade colon equals grades
Tim’s grade colon equals grades Timmy and for that matter probably
Timmy and for that matter probably
Timmy and for that matter probably grades should be capitalized to anyway
grades should be capitalized to anyway
grades should be capitalized to anyway we’ll use it as it will assume that for
we’ll use it as it will assume that for
we’ll use it as it will assume that for some reason we wanted it to be internal
some reason we wanted it to be internal
some reason we wanted it to be internal so so so now we can do that and then we
so so so now we can do that and then we
so so so now we can do that and then we could say yeah format print line let’s
could say yeah format print line let’s
could say yeah format print line let’s print Tim’s braid
print Tim’s braid
print Tim’s braid we’ll say that come back up here go run
we’ll say that come back up here go run
we’ll say that come back up here go run go tight and so we got the full map
go tight and so we got the full map
go tight and so we got the full map because we were printing that out but
because we were printing that out but
because we were printing that out but also we got a 42 there
also we got a 42 there
also we got a 42 there unfortunately because Tim was doing so
unfortunately because Tim was doing so
unfortunately because Tim was doing so poorly in our class he’s been he’s been
poorly in our class he’s been he’s been
poorly in our class he’s been he’s been dropped from the class basically we’re
dropped from the class basically we’re
dropped from the class basically we’re pushing him back a grade it’s a really
pushing him back a grade it’s a really
pushing him back a grade it’s a really sad situation but anyways if you want to
sad situation but anyways if you want to
sad situation but anyways if you want to remove something you can just use the
remove something you can just use the
remove something you can just use the delete syntax so just delete and then
delete syntax so just delete and then
delete syntax so just delete and then delete from where we’re gonna delete
delete from where we’re gonna delete
delete from where we’re gonna delete from grades and then what are we gonna
from grades and then what are we gonna
from grades and then what are we gonna delete well we’re we’re deleting all
delete well we’re we’re deleting all
delete well we’re we’re deleting all little Timmy
little Timmy
little Timmy good bye Timmy and then what we can do
good bye Timmy and then what we can do
good bye Timmy and then what we can do is let’s just cut and paste down here
is let’s just cut and paste down here
is let’s just cut and paste down here we’ll save that and let’s run this one
we’ll save that and let’s run this one
we’ll save that and let’s run this one more time go run go touch go so now as
more time go run go touch go so now as
more time go run go touch go so now as you can see Tim is no longer with us
you can see Tim is no longer with us
you can see Tim is no longer with us finally the last thing that we can do is
finally the last thing that we can do is
finally the last thing that we can do is not have multiple cursors cool and what
not have multiple cursors cool and what
not have multiple cursors cool and what we’re going to do now is iterate through
we’re going to do now is iterate through
we’re going to do now is iterate through a map I almost called it a dictionary
a map I almost called it a dictionary
a map I almost called it a dictionary anyway which is probably a common task
anyway which is probably a common task
anyway which is probably a common task that you’re gonna need to do so when you
that you’re gonna need to do so when you
that you’re gonna need to do so when you iterate through this is kind of
iterate through this is kind of
iterate through this is kind of basically you’re gonna use the the range
basically you’re gonna use the the range
basically you’re gonna use the the range keyword I’m pretty sure we’ve used range
keyword I’m pretty sure we’ve used range
keyword I’m pretty sure we’ve used range already but yeah we have so before when
already but yeah we have so before when
already but yeah we have so before when we used range it returned in index and a
we used range it returned in index and a
we used range it returned in index and a value right and we just took the index
value right and we just took the index
value right and we just took the index and we just used underscore basically
and we just used underscore basically
and we just used underscore basically because if you wanted the index cool now
because if you wanted the index cool now
because if you wanted the index cool now in the case of a dictionary a dictionary
in the case of a dictionary a dictionary
in the case of a dictionary a dictionary already like if you wanted to iterate
already like if you wanted to iterate
already like if you wanted to iterate over that dictionary in theory it could
over that dictionary in theory it could
over that dictionary in theory it could are like in Python when you iterate over
are like in Python when you iterate over
are like in Python when you iterate over it I said dictionary anyway
it I said dictionary anyway
it I said dictionary anyway I was gonna do that map in Python if you
I was gonna do that map in Python if you
I was gonna do that map in Python if you were to iterate over a dictionary you
were to iterate over a dictionary you
were to iterate over a dictionary you would get back just like the key and
would get back just like the key and
would get back just like the key and then if you wanted the value do the
then if you wanted the value do the
then if you wanted the value do the dictionary key thing but if you iterate
dictionary key thing but if you iterate
dictionary key thing but if you iterate over a map and go language
over a map and go language
over a map and go language it will return you can return both the
it will return you can return both the
it will return you can return both the key and the values so for example you
key and the values so for example you
key and the values so for example you would say for K comma V so key value in
would say for K comma V so key value in
would say for K comma V so key value in range grades we can iterate over that so
range grades we can iterate over that so
range grades we can iterate over that so now we could just say format print line
now we could just say format print line
now we could just say format print line K well we could just say well let’s do
K well we could just say well let’s do
K well we could just say well let’s do [Music]
[Music]
[Music] let’s do K sorry it’s under case k and
let’s do K sorry it’s under case k and
let’s do K sorry it’s under case k and then colon comma V so it’ll be like the
then colon comma V so it’ll be like the
then colon comma V so it’ll be like the student’s name and then their grade
student’s name and then their grade
student’s name and then their grade something like that let’s go ahead and
something like that let’s go ahead and
something like that let’s go ahead and come up here go run go type duck go cool
come up here go run go type duck go cool
come up here go run go type duck go cool and then basically we’ve iterated over
and then basically we’ve iterated over
and then basically we’ve iterated over it and then now yeah you’ve you’ve got
it and then now yeah you’ve you’ve got
it and then now yeah you’ve you’ve got the the students name of the grade okay
the the students name of the grade okay
the the students name of the grade okay pretty cool but obviously super simple
pretty cool but obviously super simple
pretty cool but obviously super simple example the other thing that you’ll
example the other thing that you’ll
example the other thing that you’ll probably notice in that we’re going to
probably notice in that we’re going to
probably notice in that we’re going to kind of exemplify in the next tutorial
kind of exemplify in the next tutorial
kind of exemplify in the next tutorial is like it doesn’t appear super simple
is like it doesn’t appear super simple
is like it doesn’t appear super simple like how what if what if we wanted more
like how what if what if we wanted more
like how what if what if we wanted more than just a float 32 here like what if
than just a float 32 here like what if
than just a float 32 here like what if we wanted multiple values could we add
we wanted multiple values could we add
we wanted multiple values could we add multiple values like for example could
multiple values like for example could
multiple values like for example could we get away with
we get away with
we get away with I don’t know throwing in you know a list
I don’t know throwing in you know a list
I don’t know throwing in you know a list or a – you know like like a float 32
or a – you know like like a float 32
or a – you know like like a float 32 inch string or int and float 32 and so
inch string or int and float 32 and so
inch string or int and float 32 and so on and no so so what if you do want to
on and no so so what if you do want to
on and no so so what if you do want to have multiple values there well as
have multiple values there well as
have multiple values there well as you’ve seen so far structs are your best
you’ve seen so far structs are your best
you’ve seen so far structs are your best friend in golang so actually you would
friend in golang so actually you would
friend in golang so actually you would just create your own type that might
just create your own type that might
just create your own type that might have multiple values and that’s what you
have multiple values and that’s what you
have multiple values and that’s what you passed there if you want to do that
passed there if you want to do that
passed there if you want to do that which is something we are going to have
which is something we are going to have
which is something we are going to have to do in the next tutorial so anyways if
to do in the next tutorial so anyways if
to do in the next tutorial so anyways if you have questions comments concerns on
you have questions comments concerns on
you have questions comments concerns on maps leaving below otherwise I will see
maps leaving below otherwise I will see
maps leaving below otherwise I will see you in the next tutorial
”
Be First to Comment