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What is (c App) in the following function declaration?
func (c App) SaveSettings(setting string) revel.Result {
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func Keyword to define a function
(c App) ????
SaveSettings Function name
(setting string) Function arguments
revel.Result Return type
691
func: It is a keyword in Go language, which is used to create a function. function_name: It is the name of the function. Parameter-list: It contains the name and the type of the function parameters. Return_type: It is optional and it contain the types of the values that function returns.
The parenthesis before the function name is the Go way of defining the object on which these functions will operate. So, essentially ServeHTTP is a method of type handler and can be invoked using any object, say h, of type handler.
In Golang, make() is used for slices, maps, or channels. make() allocates memory on the heap and initializes and puts zero or empty strings into values. Unlike new() , make() returns the same type as its argument. Slice: The size determines the length.
A function in Go is also a type. If two function accepts the same parameters and returns the same values, then these two functions are of the same type. For example, add and substract which individually takes two integers of type int and return an integer of type int are of the same type.
(c App) gives the name and type of the receiver, Go's equivalent of C++ or JavaScript's this or Python's self. c is the receiver's name here, since in Go it's conventional to use a short, context-sensitive name instead of something generic like this. See http://golang.org/ref/spec#Method_declarations --
A method is a function with a receiver. The receiver is specified via an extra parameter section preceeding the method name.
and its example:
func (p *Point) Length() float64 {
return math.Sqrt(p.x * p.x + p.y * p.y)
}
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