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so the next one more you control
 and others this is big

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why are you just
it give you bet

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that so complicated yeah i
thought let's drive for

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really into the hot stuff right
 away so we don't have much

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time so no actually you will need
 it and you will need it for

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the problem you will
have to solve the task

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of this course you wanted to solve
 yes yes or no user interfaces

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through them and so the
problem is we need to

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separate somehow the concerns
data and logic on one hand

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use into action people click
 on buttons all the time

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like and then the
presentation in two main

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to see something yeah
there's no to react

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to and we need to separate
 all these things that

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all program keeps maintainable
and that is flexible at some

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points and also confirm rules
 so that we can kind of

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to the same things the very
 way in and change that

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yeah so it's already codes
 model you controller

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and we get three different things
 we want to decompose have

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had already than that these three
parts model of human controller

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might take certain yeah
functionality and and

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or or one of those so the the first
 stores the data and provides

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the logic also sometimes called
business logic tolls the actual

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things which are happening
 the viewers who yeah

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it's a view so it's the same your
 see if and it is therefore

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to prevent or or whatever the
yeah they they formation the

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data from the model to the user
and then there's a controller

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which handles all the interaction
 and of course of you was

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receives interactions of if you
click on a button the buttons

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part of if you of course and
we already see that in the

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other hand and the most important
 thing here is that we need

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to decouple all these things so they
 shouldn't be kind of completely

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into my one class so so
the user into x with a

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view we already said that the due
process given to the controller

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the controller updates the model
 and before all that happens

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if you which is that as an observer
 and here we got like the

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first south and then we will
 discuss in the second

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and i don't automatically
 like works right

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yeah and now we're going to
understand how the magic internally

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first so almost almost directly
because of one thing that not

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just at least want to
mention is and we see your

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it comes in like a lot of variance
 and if you start fooling

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and we see more you control if
you start fooling for diagrams

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for coal i mean it's mass
yeah you will have like

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thousand pages and two thousand
 descriptions all that

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everybody tells us like
the complete contrary

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to the to the to the wonderful
 but they all agreed

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that it's about separating the
concerns is autistic or like

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the common cold and it's not
everything is different so it's

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most likely that ninety percent
is the same and then the actual

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realisation might differ
from library to library

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because it might be used
in different contexts

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and so you basically often you
also do not implement the model

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you can call itself but you
use some sort of framework

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yeah actually does that for you
 and as it is a pattern you

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already understand than
they didn't model the

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controller and all they
 did this here and

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so if you notice the someone is
using a model you controller

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you already know that all the
data is residing and insights

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model that the view is going to
yeah going to do the presentation

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to the user and says something in
 between whatever it is called

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of might you if you have
 you want so whatever

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that method my different
 but the general idea

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is always the same soul let's
 dive into the details

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of so we have three patterns
 which all part of

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this model we can but
which model you can

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control as composed of we
have to observe a pattern

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which kind of registered to view
 as an observable for a model

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and then the model
notifies single

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service we will cover
that in the second

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we have to strategy pattern
 which can have helps us

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what the strategy for the control
 how it will solve problems

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and then when the composite
pattern which have system good

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if you from sort
of ok component