Primitive Types & Constants

Primitive Types & Constants

Go has a small set of fundamental types, which makes the language easier to learn and reason about.

Primitive types

Type	Description
bool	true/false
string	immutable UTF-8 text
int, int8, int16, int32, int64	signed integers
uint, uint8, uint16, uint32, uint64	unsigned integers
float32, float64	floating-point numbers
byte	alias for uint8
rune	alias for int32 (Unicode code point)

Go uses int and uint as the default integer types when specific size is not required.

Constants

Constants are values that cannot change after they are declared.

const Pi = 3.14159
const (
    Red   = iota
    Green
    Blue
)

iota is a tool for automatically incrementing constant values within a block.