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. String Backslash Escape
  8. Rune
  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. String as Chars
  22. regexp
  23. Read File
  24. Write to File
  25. Walk Dir
  26. Check File Exist
  27. System Call
  28. Get Script Path
  29. Pointer
  30. Defer
  31. Random Number

Examples

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

Reference

  1. Go Spec