map-equal.go

func equal(x, y map[string] int) bool { 
  if len(x) != len(y) { 
    return false 
  } 
  for k, xv := range x {                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
    if yv, ok := y[k]; !ok || yv != xv {
      return false
    } 
  } 
  return true 
}

equal(map[string] int{" A": 0}, map[string] int{" B": 42})