What does golang nil mean?

Everyone knows that when you declare a variable but do not assign a value, golang will automatically give your variable type a corresponding default zero value.

This is the zero value corresponding to each type:(Recommended learning:go)

bool -> false numbers -> 0 string -> "" pointers -> nil slices -> nil maps -> nil channels -> nil functions -> nil interfaces -> nil

Another strcut:

type Person struct { Age int Name string Friends []Person } var p Person // Person{0, "", nil}

The variable p is only declared but not assigned, so all fields of p have corresponding zero values.

1.Go’s documentation says that nil is a predefined identifier that represents the zero value of a pointer, channel, function, interface, mapping or slice. It is not one of the keywords of GO.

2.nil can only be assigned to pointer, channel, func, interface, map or slice type variables (non-basic types), otherwise pani will be triggered

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