Golang: Basic Types

By Xah Lee. Date: . Last updated: .

Basic Types

Go's basic types are

Boolean:

String:

Signed integer types:

Unsigned Integer types:

Type to represent pointer address. [see Golang: Pointer]

Float type. (uses decimal notation, to represent approximation of Real Numbers)

Complex numbers type:

The int, uint, and uintptr types are usually 32 bits wide on 32-bit systems and 64 bits wide on 64-bit systems.

Rune Type

Golang: Rune

Find a Value's Type

fmt.Printf("%T\n", val) → print a value's type.

package main

import "fmt"

func main() {

	var nn = 3
	var ff = 3.123

	// print their types
	fmt.Printf("%T\n", nn) // int
	fmt.Printf("%T\n", ff) // float64
}

Type conversions

type(v) → converts the value v to the type type, where type is the same keyword as the type declaration.

example:

float64(3) → convert value 3 to float64 type.

package main

import (
	"fmt"
	"reflect"
)

func main() {
	var i int = 42
	var f = float64(i)
	fmt.Println(reflect.TypeOf(f)) // float64

}

Number to String

To convert number type to string, use fmt.Sprintf(…)

see Golang: Print

Convert String, Byte Slice, Rune Slice

see Golang: String, Byte Slice, Rune Slice

Reference

The Go Programming Language Specification - The Go Programming Language#Types

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Golang

  1. Compile, Run
  2. Source Encoding
  3. Package, Import
  4. Comment
  5. Print
  6. String
  7. String Functions
  8. Print String
  9. String Backslash Escape
  10. Rune
  11. Variable
  12. Zero Value
  13. Constant
  14. If Then Else
  15. Switch/Case
  16. Loop
  17. Basic Types
  18. Array
  19. Slice
  20. Map
  21. Struct
  22. Function
  23. Closure
  24. Pointer
  25. String, Byte Slice, Rune Slice
  26. regexp
  27. Read File
  28. Write to File
  29. Walk Dir
  30. Check File Exist
  31. System Call
  32. Get Script Path
  33. Defer
  34. Random Number

Examples

  1. Match Any Regexp
  2. Find Replace
  3. Validate Links
  4. Generate Sitemap

Reference

  1. Go Spec