含义：变量<-struct {} {}

Question

I don't understand the meaning of the double {}. This is not made clear in any learning material. Thanks.

variable <-struct {}{} 

Answer 1

variable is a variable of type channel (values are sent on it)

<- is a send operator

struct{} is type empty struct (has no fields)

{} makes it a struct literal (creates a value of the given struct type)

To better understand this form let me give you an example of a different struct type:

p := struct{ X, Y float64 }{0.0, 0.0}