Swift Data Types

Swift Data Types

Swift has built-in types like Int, Double, Bool and String.

Swift uses type inference to deduce the type from the value.

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Basic Types

Declare constants with let and variables with var.

Swift infers the type from the initial value.

Example

let anInt = 42           // Int
let aDouble = 3.14       // Double
let isSwiftFun = true    // Bool
let greeting = "Hello"    // String
print(aDouble)
print(isSwiftFun)
print(greeting)

This example declares common Swift types and prints them.

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Type Inference vs Annotation

Swift usually infers the type from the initial value, but you can add a type for clarity.

Example

let inferred = 10          // Int (inferred)
let annotated: Double = 3  // Double (explicit)
print(type(of: inferred), type(of: annotated))

This example contrasts inferred vs. explicit types.