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Welcome back to the continuation of creating a function.

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So in this video let's have a look at why do we need a function.

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So for what we have done as we talk about why we need a function, if this function is performing,

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why if any function then you would take us correct?

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Otherwise we say no.

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Have a look.

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Well, the PDF, the slides.

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Everything will be provided for us.

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So don't worry.

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Just understand what you are doing.

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Okay.

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So one functions helps to make your code more readable so that this function makes a code readable.

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Yes, because sometimes if you refer to X and Y, what does it mean as you mean this function?

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We don't have the function here like before we declare verbal like A and b x is code.

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This you don't know what x is.

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X can be let's say somebodies name.

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It can be a theory, it can be somebody's nickname, it can be whatever.

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But with function it makes our code more readable.

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Meaning that for this function, if look at a name, it tells you that we are adding something together.

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So if inside this one it tells you that well, we are adding X means number one.

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And number two, that is first point.

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So this function is correct.

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You meet the first requirement and a requirement is that functions can make your code more usable.

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Well, when we say more reasonable, what does it mean?

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Meaning that I can reference any way I want my message to be appeared.

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I will make our core dysfunction anyway.

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My code and I have access to it.

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So does this one solve it?

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I can say that it's solved only let's say three over ten for now because we haven't finished the function

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yet.

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That's why we talk about parameters and argument.

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After you going through that, then you're going to get ten over ten for this function that you created.

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So function mean is to be what, reusable?

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That's a good point.

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Next point is that function can help make your code maintainable again.

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Once it maintainable simply means that if you run out that we are writing this code, you you understand

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what is doing over here.

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But let's say that after ten years or 20 years and you take the same code because, oh, my gosh, what

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was the meaning of this one was even of X.

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But as soon as we see the name or the function is that, oh, this function is doing this.

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So maintaining that function is really easy.

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So this function also meets that perfect.

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Next one is that function can improve the performance of your code.

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Well, this is advanced level part of because when it comes to Y JavaScript, Y JavaScript, I mean

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run behind the scene.

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If you get a function, it is to go into the memory of JavaScript by that is advanced part.

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Don't worry about that.

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So this one, I'll give it as question mark.

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The next part is that functions can help to modernize your code.

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Meaning.

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We can copy certain certain code together at one place to mobilize it.

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The next one is that it.

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Is this more it helps for?

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Testing and improved testing.

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That was an advanced part of it.

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So in short, functions should be reusable, meaning it can any way I want I can just visit and then

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a function might contain a piece of logic in your application.

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But right now we don't have all those things that our function is doing right now.

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So in this video, let's talk about parameters and argument.

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And then after that, we talk about what is called return keyword.

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After you go through that, then a function, the whole of this.

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Why a function?

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This particular function we meet.

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So let's see in the next video, guys.