Swift Data Types

In Swift, every piece of data belongs to a type — this tells the system what kind of value it holds.

Used for whole numbers like 5, 100, or -7.

let age: Int = 25

Stores numbers with decimals. Great for precise values.

let pi: Double = 3.14

Also stores decimal values but with slightly less precision.

let temperature: Float = 36.6

Holds a bunch of letters, words, or sentences.

let greeting: String = "Hello, Swift!"

Only true or false. Useful for decision-making.

let isSwiftFun: Bool = true

Stores a list of items, like multiple numbers or names.

let fruits: [String] = ["Apple", "Banana", "Mango"]

Stores items as key-value pairs. Like a word and its meaning.

let student: [String: String] = ["name": "Alex", "grade": "A"]

Might have a value, or might be empty (nil).

var middleName: String? = nil

These types help Swift understand and handle your data correctly and safely.

Watch these YouTube tutorials to understand GIT Tutorial visually:

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