If

Go's if statements are like its for loops; the expression need not be surrounded by parentheses ( ) but the braces { } are required.

if.go

  1. package main
  3. import (
  4.     "fmt"
  5.     "math"
  6. )
  8. func sqrt(x float64) string {
  9.     if x < 0 {
  10.         return sqrt(-x) + "i"
  11.     }
  12.     return fmt.Sprint(math.Sqrt(x))
  13. }
  15. func main() {
  16.     fmt.Println(sqrt(2), sqrt(-4))
  17. }