All language subtitles for 004 Pulling the Pieces Apart_en

In the last section, we wrote out our first tiny little dart program, this is essentially a hello

world program and I know hello worlds are very boring and you don't really like to see them inside of

courses.

But in this case, we can actually learn a lot about the programming language by tearing apart this

snippet of code line by line.

And so that's exactly what we're going to do in this section.

We're going to start with this first line of code right here, and we're going to tear this thing apart

line by line or piece by piece and get a better idea of what's going on behind the scenes.

So let's get to it.

In this diagram right here, I took that line and put it into a series of different blue boxes, so

we're going to talk about every little chunk inside of here, starting off with the word vare on the

far left hand side, the word vare declares a new variable.

This is one way of many in which we can declare a new variable inside of Dart.

And we'll very shortly see some of the other ways in which we can declare a variable rate.

After that, we put down the variables name.

In this case, the name of the variable was simply name, just like many other programming languages.

We can then later on reference this variable by simply writing out the word name.

We then placed our equal sign and then on the right hand side that we had a reference to the function,

my name, the set of parentheses after my name invokes that function or it runs it returns a value and

then that value gets assigned to the variable name right here.

One thing I want to point out in particular is the semicolon at the end of this line.

So Dart requires us to make use of semicolons.

They're not optional as they are inside of JavaScript.

Now, the last thing I want to mention about this line of code right here is that there's actually two

separate things occurring on the left hand side of the equals sign.

We have VARE and then name.

These two words right here form a step that we refer to as variable declaration, variable declaration

is the process of actually creating this variable and telling darte, hey, here's a new variable and

here's its name.

Then with the equal sign and the call to the mining function, we have a second step referred to as

variable initialization, initialization is the process of assigning a value to a variable that has

been declared.

So, again, two separate steps here.

The first one is variable declaration and the second is initialization.

This might seem like a very small distinction to make, but later on, as we start to go deeper into

darte, the difference between declaration and initialization is going to start to get very important.

OK, so we just took apart one line of code, let's continue in the next section and we're going to

continue looking at this little snippet right here.

So quick break and I'll see you in just a moment.