Go-1.18-GenericLearnV2.go

package main

import (
	"fmt"
)
// Subtractable is a type constraint that defines subtractable datatypes to be used in generic functions
type Subtractable interface {
	int | int32 | int64 | float32 | float64 | uint | uint32 | uint64
}

func main(){
	var a int = 20
	var b int = 10

	result := Subtract(a, b)

	var c float32 = 20.5
	var d float32 = 10.3

	result2 := Subtract(c, d)
	
	fmt.Println("Result: ", result)
	fmt.Println("Result2: ", result2)
}

// We define the Type parameter V, which is has a Constraint of Subtratacble
// We also say that function parameter a and b has the data type of V
// We then make the function return V
func Subtract[V Subtractable](a, b V) V {
	return a - b
}