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ID: go-best-practices/comparing-address-nil
Language: Go
Severity: Info
Category: Best Practices
The code if &x == nil
is not recommended in Go and should be avoided.
Here are a few reasons why:
&x
directly to nil
using ==
is not a valid or meaningful comparison. The address of a variable is a memory location and cannot be directly compared to nil
to check for its value.nil
using ==
does not accurately check if the variable itself is nil. It only checks if the address is null, not the value stored at that address.nil
: In Go, nil
is typically used to check if a pointer or reference type is uninitialized or doesn’t point to a valid object. It is not meant to be used to compare the address of a variable.To check if a variable is nil, you should directly compare its value to nil
without taking its address:
if x == nil {
// Code block
}
This is the correct and idiomatic way to check if a variable is nil in Go.
By avoiding the usage of &x == nil
and using x == nil
instead, you can write cleaner and more accurate code that adheres to Go’s best practices.
func main() {
if &myVar == nil {
}
}
func main() {
var ptr *int = &myVar
if ptr == nil {
}
}