It is a useful data structure. It helps to store heterogeneous data. The Union is used to represent tree data structures. It provides cases, and each case consists of heterogeneous data.
Example :
type Calcualte =
| Add of val1 : int * val2 : int
| Multiply of val1 : int * val2 : int
let compute vall =
match vall with
| Add (val1, val2) -> val1+val2
| Multiply (val1, val2)->val1*val2
let addition = compute (Add(10,10))
let multiplication = compute (Multiply(2,5))
printf "Addition = %d\nMultiplication = %d" addition multiplication
