Local Variable Declarations

Short variable declarations (:=) should be used if a variable is being set tosome value explicitly.

BadGood
  1. var s = "foo"
 
  1. s := "foo"

However, there are cases where the default value is clearer when the varkeyword is use. Declaring Empty Slices, for example.

BadGood
  1. func f(list []int) {
  2.   filtered := []int{}
  3.   for , v := range list {
  4.     if v > 10 {
  5.       filtered = append(filtered, v)
  6.     }
  7.   }
  8. }
 
  1. func f(list []int) {
  2.   var filtered []int
  3.   for , v := range list {
  4.     if v > 10 {
  5.       filtered = append(filtered, v)
  6.     }
  7.   }
  8. }