union 
Creates an array of unique values from all given arrays.
This function takes two arrays, merges them into a single array, and returns a new array containing only the unique values from the merged array.
Signature 
typescript
function union<T>(arr1: T[], arr2: T[]): T[];Parameters 
- arr1(- T[]): The first array to merge and filter for unique values.
- arr2(- T[]): The second array to merge and filter for unique values.
Returns 
(T[]): A new array of unique values.
Examples 
typescript
const array1 = [1, 2, 3];
const array2 = [3, 4, 5];
const result = union(array1, array2);
// result will be [1, 2, 3, 4, 5]
