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pkbhowmick/interface_example.go

Created October 31, 2021 06:49
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An example of interface in Golang
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interface_example.go
// A simple example of interface in Golang:
package main
import (
"fmt"
"math"
)
type Shape interface {
GetArea() float64
}
type Rectangle struct {
Length float64
Height float64
}
func NewRectangle(l, h float64) *Rectangle {
return &Rectangle{
Length: l,
Height: h,
}
}
func (r *Rectangle) GetArea() float64 {
return r.Height * r.Length
}
type Circle struct {
Radius float64
}
func NewCircle(r float64) *Circle {
return &Circle{
Radius: r,
}
}
func (c *Circle) GetArea() float64 {
return c.Radius * c.Radius * math.Pi
}
var _ Shape = &Rectangle{}
var _ Shape = &Circle{}
func main() {
rec := NewRectangle(10, 6)
crl := NewCircle(2.5)
shapes := []Shape{rec, crl}
for _, o := range shapes {
fmt.Printf("Interface value: %v and type: %T\n", o, o)
fmt.Println(o.GetArea())
}
}
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Output:

Interface value: &{10 6} and type: *main.Rectangle
60
Interface value: &{2.5} and type: *main.Circle
19.634954084936208

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