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+---
+title: Go Interfaces
+---
+# Go Interfaces
+
+An interface in Go is a collection of methods. If a type can satisfy all methods in an interface then it is part of that interface.
+
+Let's create a shape interface:
+
+```go
+type shape interface {
+  area() float64
+  perimeter() float64
+}
+```
+
+This interface has two methods area() and perimeter(). Now lets create a rectangle that satisfies this interface:
+
+```go
+type rectangle struct {
+  width, height float64
+}
+
+func (r rectangle) area() float64 {
+  return r.width * r.height
+}
+
+func (r rectangle) perimeter() float64 {
+  return 2*r.width + 2*r.height
+}
+```
+
+This rectangle contains all the methods needed to be a shape. Lets add another circle:
+
+```go
+type circle struct {
+  radius float64
+}
+
+func (c circle) area() float64 {
+  return math.Pi * c.radius * c.radius  // math.Pi is the Pi constant in the go math package
+}
+
+func (c circle) perimeter() float64 {
+  return 2 * math.Pi * c.radius
+}
+```
+
+Now we can create a function that prints out the information of any shape:
+
+```go
+func shapeInfo(s shape) {
+	fmt.Println(reflect.TypeOf(s)) // reflect.TypeOf(s) will return the type of shape
+	fmt.Println(s.area())
+	fmt.Println(s.perimeter())
+}
+```
+Because both rectangle and circle satisfy the interface shape they can be used in the shapeInfo function:
+
+```go
+func main() {
+r := rectangle{width:5, height:10}
+c := circle{radius: 12}
+
+shapeInfo(r)
+shapeInfo(c)
+}
+```
+Here we called shapeInfor for both a type rectangle and a type cricle.
+
+If we removed the perimeter method from the circle type we would get an error such as:
+
+```
+cannot use c (type circle) as type shape in argument to shapeInfo:
+        circle does not implement shape (missing perimeter method)
+```
+
+# The empty interface
+
+The empty interface is a common tool used by Go programmers. An empty interface contains no methods and has the form:
+
+```go 
+interface{}
+```
+
+An empty interface can hold values of any type as every type implements atleast zero methods. This can be useful for designing functions where the input type is unknown.
+
+```go
+func describe(i interface{}) {
+  fmt.Printf("(%v, %T)\n", i, i) // Print the value and type of i
+}
+```