App Development Exam > App Development Videos > Swift in Xcode: The Complete iOS Development Guide > Sorting Arrays! (Swift in Xcode)
Sorting Arrays! (Swift in Xcode) Video Lecture | Swift in Xcode: The Complete iOS Development Guide - App Development
FAQs on Sorting Arrays! (Swift in Xcode) Video Lecture - Swift in Xcode: The Complete iOS Development Guide - App Development
| 1. What is the purpose of sorting arrays in Swift? |  |
Ans. The purpose of sorting arrays in Swift is to arrange the elements in a specific order, such as ascending or descending, to make it easier to search, filter, or display the data in a meaningful way.
| 2. How can I sort an array in Swift? | |
Ans. You can sort an array in Swift by using the built-in sort() or sorted() methods. The sort() method sorts the array in place, while the sorted() method returns a new sorted array.
| 3. Can I sort an array of custom objects in Swift? | |
Ans. Yes, you can sort an array of custom objects in Swift by implementing the Comparable protocol in your object class. This allows you to define custom sorting criteria based on the properties of your objects.
| 4. What is the time complexity of the sort() method in Swift? | |
Ans. The time complexity of the sort() method in Swift is typically O(n log n), where n is the number of elements in the array. This means that the sorting algorithm becomes more efficient as the size of the array increases.
| 5. Are there any performance considerations when sorting large arrays in Swift? | |
Ans. Yes, when sorting large arrays in Swift, it is important to consider the performance impact. Using the sorted() method instead of sort() can be beneficial when dealing with large arrays, as it creates a new sorted array instead of modifying the original one. Additionally, using a custom sorting algorithm tailored to your specific requirements can help improve performance.
Text Transcript from Video
hey what's going on everybody today I'm
going to show you how to sort arrays of
integers strings and structures so let's
go ahead and get started
so right now I just have a standard
project I'm just gonna go right in here
to my view controller dot Swift and
inside of here I'm gonna create a new
array so this will be my array that I'm
going to be using so I'm going to save
our array will be equal to an array of
integers and then open parentheses close
parentheses like so now inside of the
viewdidload we can say array will be
equal to and our gonna make this equal
to an open square bracket close bracket
zero comma five or whatever comma 5.2 or
whatever it really is at random numbers
and we're actually going to take these
numbers and sort them out so in order
for us to do this this is actually very
simple you just new say array dot sort
and inside of here we want to say open
curly bracket enter close curly bracket
and inside of here this is what we want
to sort I'm actually going to make this
a one-liner as to make things not so
confusing so right inside of here we
have our dollar sign zero which is
basically we're comparing this first
variable with the second variable so if
the dollar sign zero is less than this
we want to sort it out properly so we
can say dollar sign zero is less than
and then we can say dollar sign one so
if it's less than that we're going to
sort it out accordingly now let's go
down here and I will show you exactly
how it sorts out so let's go down here
until same NSLog open parentheses close
parentheses and inside of this we say
open quote each mark close quotation
marks slash open parentheses close
parentheses and inside of this we're
just gonna type in array now if we were
to build and run this so as you can see
we have nothing in the simulator but if
we go down here to our console you will
see that it sorted out accordingly so
our first variable is 0 for 652 and 65
so it all sorted out now if you want to
switch this sign around it's gonna go
the opposite direction like so 65 52 6 4
and 0
so I made not a few controller about
Swift and in here I'm going to save our
array will be equal to we're going to
make this equal to open square bracket
close square bracket inside of this
we're gonna say string so it is going to
be an array of strings then open
parentheses close parentheses at the end
to finalize it now let's go down here
and I'm just gonna say array will be
equal to and I'm gonna make this equal
to open square bracket close for a
bracket open quotation mark close
quotation mark and we're just gonna put
some strings into all of these like so
so right inside of here I can say okay
I'm just gonna type pretty randomly and
try to get everything to be sorted out
program eclis so let's go in here and
now let's go down here we're gonna say
array dot sort and inside of here I'm
going to say open curly bracket close
curly bracket and inside of this I'm
going to say dollar sign 0 is less than
dollar sign 1 so essentially we're just
comparing the first variable with the
second variable as you can see now let's
go down here and I'm just gonna say
NSLog and then inside of here I'm just
going to say you open quotation by
closed quotation mark slash open
parentheses close parentheses and I'm
just gonna type in array now let's go
down here and I'm just going to delete
deleting whatever's left in the NSLog
now if you were to build and run this it
will sort out accordingly so right here
it starts off with a gun G then T then X
then Y so it is all in alphabetical
order now you can of course switch this
sign around and get the opposite effect
like so so now it starts with YX TGA now
if you want to have an array of
structures we're gonna just say struct
and I'm just gonna call this my
structure you can really call this
whatever you want and inside of the
structure I'm just gonna have a string
so I'm gonna save our string value : and
then string like so and then exclamation
point and now down here I also can have
a second variable so I'm gonna say the
VAR int value : and then this will be
equal to an integer like so we're just
gonna go down here and so I'm gonna say
var array will be equal to and I'm gonna
make this equal to open square bracket
close square bracket and inside of this
we're gonna just say structure so it's
going to be an array of this structure
that we created then after that we say
open parentheses close parentheses and
now let's head into our viewdidload
inside of here we can say array will be
equal to and we're gonna set this equal
to open square bracket close square
bracket then inside of this we just type
in structure and then open parentheses
and inside of this we can assign our
string value and our Intel u so let's
just have that in real quick or string
value I'm going to set this to just
random letters and our into value I will
set this also to random numbers like so
there shouldn't help be quotation marks
around this value right there now I'm
going to copy and paste all of this that
we have right here so comma enter copy
and paste just like so and I'm gonna
change up some of these variables so
then also change of some of these string
values and now we have an array of
structures now let's actually take this
and sort it out now what do you want to
sort it out by you can determine that
whether you want to sort it out by the
string value or the int value so inside
of this we can say array dot sort and
inside of this we're going to say open
curly bracket close curly bracket and
inside of this we have dollar sign 0 is
less than dollar sign 1 now this will
where this would have worked in any of
the other circumstances but in this case
we actually need to compare value so
we're gonna say dollar sign 0 dot string
value and then down here we're gonna say
dot string value as well so now we're
comparing the string values for both the
0 and the 1 so now let's actually see
what's going on so I'm gonna save NSLog
and inside of this will be open
quotation mark close quotation mark
slash open parentheses close parentheses
array and then after that we are going
to close that up and then now let's
build and run now as you can see Allah
returned was test of view controller dot
structure and all these different
circumstances so we need to actually go
down here and I'm gonna say for I in
zero dot dot less than and we're gonna
make this equal to array dot count like
so now after this is done we say open
curly bracket close curly bracket and
inside of this we take this NSLog that
we created and inside of the senate's
log we say array and then open square
bracket close for a bracket put I in
there and that will allow us to go
through each of the sections there then
we're going to say dot a string value
and now this will show that we have
correctly sorted out our array and as
you can see it starts off with a dfh and
with me which is completely different
than what we had up here so it's
automatically sorted as you can tell now
if you want to do this with the int
value just need to eat a cell you say
int value like so and do that with the
second one as well and down here when
you also need to change this to int
value now if we were to build and run
this you can see that it's 540 145 and
it is all sorted out from smallest to
largest
now you of course you can always change
the sign if you want like so and that'll
do the opposite effect thank you all so
much for watching if you enjoyed this
tutorial be sure to hit that like button
down below and if I want to see more
tutorials like this for me and the
future be sure to subscribe if you want
to support the channel you've been
further you can head over to
patreon.com/scishow archetype it'll help
out a ton but anyway I will see you in
the next
going to show you how to sort arrays of
integers strings and structures so let's
go ahead and get started
so right now I just have a standard
project I'm just gonna go right in here
to my view controller dot Swift and
inside of here I'm gonna create a new
array so this will be my array that I'm
going to be using so I'm going to save
our array will be equal to an array of
integers and then open parentheses close
parentheses like so now inside of the
viewdidload we can say array will be
equal to and our gonna make this equal
to an open square bracket close bracket
zero comma five or whatever comma 5.2 or
whatever it really is at random numbers
and we're actually going to take these
numbers and sort them out so in order
for us to do this this is actually very
simple you just new say array dot sort
and inside of here we want to say open
curly bracket enter close curly bracket
and inside of here this is what we want
to sort I'm actually going to make this
a one-liner as to make things not so
confusing so right inside of here we
have our dollar sign zero which is
basically we're comparing this first
variable with the second variable so if
the dollar sign zero is less than this
we want to sort it out properly so we
can say dollar sign zero is less than
and then we can say dollar sign one so
if it's less than that we're going to
sort it out accordingly now let's go
down here and I will show you exactly
how it sorts out so let's go down here
until same NSLog open parentheses close
parentheses and inside of this we say
open quote each mark close quotation
marks slash open parentheses close
parentheses and inside of this we're
just gonna type in array now if we were
to build and run this so as you can see
we have nothing in the simulator but if
we go down here to our console you will
see that it sorted out accordingly so
our first variable is 0 for 652 and 65
so it all sorted out now if you want to
switch this sign around it's gonna go
the opposite direction like so 65 52 6 4
and 0
so I made not a few controller about
Swift and in here I'm going to save our
array will be equal to we're going to
make this equal to open square bracket
close square bracket inside of this
we're gonna say string so it is going to
be an array of strings then open
parentheses close parentheses at the end
to finalize it now let's go down here
and I'm just gonna say array will be
equal to and I'm gonna make this equal
to open square bracket close for a
bracket open quotation mark close
quotation mark and we're just gonna put
some strings into all of these like so
so right inside of here I can say okay
I'm just gonna type pretty randomly and
try to get everything to be sorted out
program eclis so let's go in here and
now let's go down here we're gonna say
array dot sort and inside of here I'm
going to say open curly bracket close
curly bracket and inside of this I'm
going to say dollar sign 0 is less than
dollar sign 1 so essentially we're just
comparing the first variable with the
second variable as you can see now let's
go down here and I'm just gonna say
NSLog and then inside of here I'm just
going to say you open quotation by
closed quotation mark slash open
parentheses close parentheses and I'm
just gonna type in array now let's go
down here and I'm just going to delete
deleting whatever's left in the NSLog
now if you were to build and run this it
will sort out accordingly so right here
it starts off with a gun G then T then X
then Y so it is all in alphabetical
order now you can of course switch this
sign around and get the opposite effect
like so so now it starts with YX TGA now
if you want to have an array of
structures we're gonna just say struct
and I'm just gonna call this my
structure you can really call this
whatever you want and inside of the
structure I'm just gonna have a string
so I'm gonna save our string value : and
then string like so and then exclamation
point and now down here I also can have
a second variable so I'm gonna say the
VAR int value : and then this will be
equal to an integer like so we're just
gonna go down here and so I'm gonna say
var array will be equal to and I'm gonna
make this equal to open square bracket
close square bracket and inside of this
we're gonna just say structure so it's
going to be an array of this structure
that we created then after that we say
open parentheses close parentheses and
now let's head into our viewdidload
inside of here we can say array will be
equal to and we're gonna set this equal
to open square bracket close square
bracket then inside of this we just type
in structure and then open parentheses
and inside of this we can assign our
string value and our Intel u so let's
just have that in real quick or string
value I'm going to set this to just
random letters and our into value I will
set this also to random numbers like so
there shouldn't help be quotation marks
around this value right there now I'm
going to copy and paste all of this that
we have right here so comma enter copy
and paste just like so and I'm gonna
change up some of these variables so
then also change of some of these string
values and now we have an array of
structures now let's actually take this
and sort it out now what do you want to
sort it out by you can determine that
whether you want to sort it out by the
string value or the int value so inside
of this we can say array dot sort and
inside of this we're going to say open
curly bracket close curly bracket and
inside of this we have dollar sign 0 is
less than dollar sign 1 now this will
where this would have worked in any of
the other circumstances but in this case
we actually need to compare value so
we're gonna say dollar sign 0 dot string
value and then down here we're gonna say
dot string value as well so now we're
comparing the string values for both the
0 and the 1 so now let's actually see
what's going on so I'm gonna save NSLog
and inside of this will be open
quotation mark close quotation mark
slash open parentheses close parentheses
array and then after that we are going
to close that up and then now let's
build and run now as you can see Allah
returned was test of view controller dot
structure and all these different
circumstances so we need to actually go
down here and I'm gonna say for I in
zero dot dot less than and we're gonna
make this equal to array dot count like
so now after this is done we say open
curly bracket close curly bracket and
inside of this we take this NSLog that
we created and inside of the senate's
log we say array and then open square
bracket close for a bracket put I in
there and that will allow us to go
through each of the sections there then
we're going to say dot a string value
and now this will show that we have
correctly sorted out our array and as
you can see it starts off with a dfh and
with me which is completely different
than what we had up here so it's
automatically sorted as you can tell now
if you want to do this with the int
value just need to eat a cell you say
int value like so and do that with the
second one as well and down here when
you also need to change this to int
value now if we were to build and run
this you can see that it's 540 145 and
it is all sorted out from smallest to
largest
now you of course you can always change
the sign if you want like so and that'll
do the opposite effect thank you all so
much for watching if you enjoyed this
tutorial be sure to hit that like button
down below and if I want to see more
tutorials like this for me and the
future be sure to subscribe if you want
to support the channel you've been
further you can head over to
patreon.com/scishow archetype it'll help
out a ton but anyway I will see you in
the next
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About this Video
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Dec 23, 2024 Last updated |
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