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Interfaces in Go vs TS

July 18th, 2021

Interfaces in Go vs TS

Although interfaces in Go and TS are quite different, it was fun to see a comparison between how these are being used in both contexts.

ts
interface Geometry {
area(): number;
}
class Rect implements Geometry {
constructor(private height: number, private width: number) {}
area(): number {
return this.height * this.width;
}
}
class Circle implements Geometry {
constructor(private radius: number) {}
area(): number {
return Math.PI * this.radius * this.radius;
}
}
class Triangle implements Geometry {
constructor(private base: number, private height: number) {}
area(): number {
return (this.base * this.height) / 2.0;
}
}
function measure(g: Geometry): void {
console.log('area :', g.area());
}
const r = new Rect(3, 4);
const c = new Circle(5);
const t = new Triangle(5, 6);
measure(r);
measure(c);
measure(t);
go
package main
import (
"fmt"
"math"
)
type geometry interface {
area() float64
}
type rect struct {
width, height float64
}
type circle struct {
radius float64
}
type triangle struct {
base, height float64
}
func (r rect) area() float64 {
return r.width * r.height
}
func (c circle) area() float64 {
return math.Pi * c.radius * c.radius
}
func (t triangle) area() float64 {
return (t.base * t.height)/2
}
func measure(g geometry) {
fmt.Println(g)
fmt.Println("area :", g.area())
}
func main() {
r := rect{width: 3, height: 4}
c := circle{radius: 5}
t := triangle{base:5, height: 6}
measure(r)
measure(c)
measure(t)
}
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