Structs

Similar to a class in Java

type gasEngine struct {
	mpg uint8
	gallons uint8
}
 
func main() {
	var myEngine gasEngine // myEngine = {mpg:0, gallons: 0}
	var myEngine2 gasEngine{mpg:25, gallons:15} // similar to a constructor
	var myEngine3 gasEngine{25, 15} // myEngine3 = {mpg:25, gallons: 15}
	// OR
	myEngine.mpg = 20
}

We can also encapsulate another struct in our gasEngine struct, such as an Owner type

type gasEngine struct {
	mpg uint8
	gallons uint8
	ownerInfo owner
}
 
type owner struct {
	name string
}
 
// Above has {mpg: 25, gallons: 15, ownerInfo.anme: "alex"}
 
// OR we can also do the following below
 
type gasEngine struct {
	mpg uint8
	gallons uint8
	owner
}
 
type owner struct {
	name string
}
 
// Then the above will have a field for gasEngine called gasEngine.name

We can also do this for int, then the gasEngine struct will have a field name called int

Anonymous structs

Methods in structs

type gasEngine struct {
	mpg uint8
	gallons uint8
}
 
func (e gasEngine) milesLeft() uint8 { // assigns this method to gasEngine struct
	return e.gallons*e.mpg
}

Interface

Similar to a struct, but helps us define a more general struct

type engine interface {
	milesLeft() uint8
}

We can then use this interface in method parameters, so that the method can take in any struct that has implemented the mileLeft() method