#golang Stupid mistakes newbies make

gistfile1.go

// A. Cannot use type switch outside of a switch statement

type PolarVortex interface {}                                                          
                                                                                       
func main() {                                                                          
  var p PolarVortex = new(PolarVortex)                                                 
  var s = p.(type) // compilation error => use of .(type) outside type switch  
}                   



// B. type assertion

var p PolarVortex = new(PolarVortex)                                                 
s := p.(PolarVortex)



// C. new of a primitive returns a pointer

i := new(int)
*i = 0



// D. python & javascript single or double quoted strings

k := "hello"
m := '>' + k + '<' // rune(62) + k (mismatched types rune and *string)


// E: 3 ways to get a pointer to a struct type
type A struct { a int }
                                                                   
a := new(A)
b := &A{}
c1 := A{}; c2:= &c1                                      
fmt.Println("output", a, b, c2)  // prints "output &{0} &{0} &{0}"

// F: Every package can declare an init function for execution
//    Real world go -> https://github.com/go-sql-driver/mysql/blob/master/utils.go#L33
func init() { ... } //  See http://golang.org/ref/spec#Program_initialization_and_execution