Swift: Type Safety and Conversions

Type Safety and Type Inference

Swift is a type-safe language. This means that the compiler checks to make sure that you are only using variables and constants in the ways that they were intended.

Swift also supports type inference. This means that the compiler can infer the type of a variable or constant based on the value that you assign to it.

For example, the following code shows how to use type inference:
let number = 10

The compiler can infer that the variable number is an integer based on the value that is assigned to it.

Numeric Literals

Numeric literals are numbers that are written in the code itself.

For example, the following code shows some numeric literals:
let integerLiteral = 10
let floatLiteral = 3.14159
let doubleLiteral = 3.14159

Numeric Type Conversion

Numeric type conversion is the process of converting one numeric type to another.

For example, the following code shows how to convert an integer to a double:
let integer: Int = 10
let double: Double = Double(integer)

Integer Conversion

Integer conversion is the process of converting one integer type to another.

For example, the following code shows how to convert an Int to a UInt:
let integer: Int = 10
let unsignedInteger: UInt = UInt(integer)

Integer and Floating-Point Conversion

Integer and floating-point conversion is the process of converting between integer and floating-point types.

For example, the following code shows how to convert an Int to a Double:
let integer: Int = 10
let double: Double = Double(integer)


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iOS Developer since 2015

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