nil in golang

gistfile1.txt

************nil in golang*******************


- nil == nil // true . 
The above statement is straight forward. 

But suppose there is a pointer of a struct whose value is nil. 

```
var t *T = nil
var p P  = t 
p == nil // returns false. 
```

Why is the above statement false? because nil is typed value in GO. 

What happens to the above state 

(A*, nil) == (nil, nil) , so even though the values are same, the types differ and hence the result is false. 


RealWorld example: 

Suppose you created a custom error with your own fields and of type error like below. 
```
 type struct MyError {
   
 }

 func(m MyError) String() string  {

 }

 func(m MyError) Error() string {

 }


 MyError  *a = &MyError{}
```

 If there is a function test(), that return error type in which we return nil of MyError pointer type.
```
 func test() (error){
     MyError *a = nil 
     ..
     return a
 }

 temp := test() 

 if temp == nil  {  //  false. 
      //do something. 
 }    
```