swift语言点评六-Numbers and Basic Values

Topics

Logical Values

struct Bool

A value type whose instances are either true or false.

Numeric Values

struct Int

A signed integer value type.

struct Double

A double-precision, floating-point value type.

struct Float

A single-precision, floating-point value type.

Ranges

struct Range

A half-open interval over a comparable type, from a lower bound up to, but not including, an upper bound.

struct ClosedRange

An interval over a comparable type, from a lower bound up to, and including, an upper bound.

Errors

protocol Error

A type representing an error value that can be thrown.

Optionals

enum Optional

A type that represents either a wrapped value or nil, the absence of a value.

Advanced Numerics

Numeric Protocols

Write generic code that works with any numeric type.

Special-Use Numeric Types

Work with fixed-width numeric types of different sizes.

Global Numeric Functions

Use these functions with numeric values and other comparable types.

See Also

Values and Collections

Strings and Text

Work with text using Unicode-safe strings.

Collections

Store and organize data using arrays, dictionaries, sets, and other data structures.