Zero Value

By Xah Lee. Date: .

Variables declared without an explicit initial value are given their default value.

Default value are different for different types of variables.

The default value for a type is called its “zero value”.

The zero values are:

package main

import "fmt"

func main() {

    var i int
    var f float64
    var b bool
    var str string
    var sl []int

    fmt.Printf("%#v\n", i)   // 0
    fmt.Printf("%#v\n", f)   // 0
    fmt.Printf("%#v\n", b)   // false
    fmt.Printf("%#v\n", str) // ""
    fmt.Printf("%#v\n", sl)  // []int(nil)

    // the %#v means print in golang syntax

}

Reference

The Go Programming Language Specification - The Go Programming Language#The_zero_value

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Golang

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

Examples

  1. match any regexp
  2. Validate Links
  3. Generate Sitemap

Reference

  1. Go Spec