Tour of Go 2.0

Basic types

Go’s basic types are:

bool
string
int  int8  int16  int32  int64
uint uint8 uint16 uint32 uint64 uintptr
byte // alias for uint8
rune // alias for int32
   // represents a Unicode code point
float32 float64
complex64 complex128

Like imports, variable declarations can be grouped into a factored block — handy for package-level vars.

Reach for int by default for integers. It’s 32 or 64 bits depending on your platform, and it’s what most Go code uses. Only go for a sized or unsigned type when you have a specific reason.

main.go ▶ Run in Playground 
package main

import (
	"fmt"
	"math/cmplx"
)

var (
	ToBe   bool       = false
	MaxInt uint64     = 1<<64 - 1
	z      complex128 = cmplx.Sqrt(-5 + 12i)
)

func main() {
	fmt.Printf("Type: %T Value: %v\n", ToBe, ToBe)
	fmt.Printf("Type: %T Value: %v\n", MaxInt, MaxInt)
	fmt.Printf("Type: %T Value: %v\n", z, z)
}