[Swift Apple ] 3. What Is a Variable? | Variables Are Like Name Tags!

🏷️ 3. Variables Are Like Name Tags!

Hello! 😊

Today, we’re going to learn about one of the most important ideas in Swift coding — variables!

The word “variable” might sound a little difficult at first,

but it’s actually very simple — it’s just like using a name tag or a labeled box in your everyday life.

Let’s learn together in a fun and easy way!

📦 What Is a Variable?

A variable is like a name tag that stores information.

When we want to remember or reuse a value,

we use a variable to say: “This value has this name!”

For example, let’s say your favorite fruit is an apple.

We can save the word “apple” using the name fruit, like this:

var fruit = "Apple"

• var tells the computer, “This is a variable!”

• fruit is the name of the variable

• "Apple" is the actual value we’re saving

So, this line of code means we’re storing the word “Apple” in a box named fruit. 🍎

🧸 Let’s Label Our Things

Now, let’s try labeling other things around us using variables!

• Your favorite toy 👉 toy

• Your favorite color 👉 favoriteColor

• Your name 👉 myName

• Your age 👉 myAge

Here’s what it looks like in Swift:

var toy = "LEGO"

var favoriteColor = "Blue"

var myName = "Minsu"

var myAge = 10

Now you can use those variables in your code to remember what you saved!

🧪 Practice: Save Your Favorite Fruit in a Variable

Let’s try a little coding activity together!

Open Swift Playground and type this:

var myFavoriteFruit = "Banana"

print("My favorite fruit is \(myFavoriteFruit)!")

When you run the code, the screen will show:

My favorite fruit is Banana!

Pretty cool, right?

Now change the value like this:

myFavoriteFruit = "Grapes"

And try printing again. You’ll see:

My favorite fruit is Grapes!

This shows how variables let you save values, change them, and use them whenever you need!

✨ Wrapping Up

Variables are one of the most important tools in coding.

But don’t worry — they’re not hard at all!