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yes What operating system and processor architecture are you using (go env)? All variables in Go have a zero value. Contrary to widely-supposed opinion, you can call methods on nil perfectly fine.

Go can still reach the method even on a nil pointer value just fine. The story of a nil pointer receiver. Unlike C or C++ where a NULL pointer is missing its type information, a nil pointer in Go is actually (PointerType, Value), where the Value is the nil. This is true even for a pointer. But you are allowed to create a variable of an interface type and this variable can be assigned with a concrete type value that has the methods the interface requires. Since methods with pointer receivers take either a value or a pointer, you could also skip the pointer altogether: func main() { var p Point // has zero value Point{X:0, Y:0} fmt.Println(p.Abs()) } See Pointers for more about pointers in Go. This is my general rule of thumb on that: If the value is optional, always do the nil check. Nil Pointers. If you declare a pointer to a type, but assign no value, the zero value will be nil. mehdy.me/2017/1 If a nil pointer is not a valid, usable instance of the interface, you should avoid passing it as that interface in the first place. Assignment to entry in nil … r/golang: Ask questions and post articles about the Go programming language and related tools, events etc. A pointer holds the memory address of a value. Go has pointers.

Close. « Prev; Index; Next » Share this page: Go Gotchas. The story of a nil pointer receiver. If the value is required but dependent upon user input, do the nil check. Its zero value is nil.. var p *int. nil is a way to say that “nothing has been initialized” for the variable. The type *T is a pointer to a T value. Press question mark to learn the rest of the keyboard shortcuts. Archived. Checking for a nil pointer is usually not the right way to resolve this sort of panic. go 1.11 and 1.14 Does this issue reproduce with the latest release? 2 years ago. 2. r/golang. In Go language, the interface is a custom type that is used to specify a set of one or more method signatures and the interface is abstract, so you are not allowed to create an instance of the interface. User account menu. u/mehdy314. Press J to jump to the feed.
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What version of Go are you using (go version)? I think this is an interesting question, because you're not asking about invoking panics, you're asking how far should one go to prevent panics.. The & operator generates a pointer to its operand.. i := 42 p = &i. Pointers. 2. The * operator denotes the pointer's underlying value.. fmt.Println(*p) // read i through the pointer p *p = 21 // set i through the pointer p


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