Merge two arrays with duplicate values

Write a function that takes two arrays as arguments. Merge both arrays and remove duplicate values. Sort the merge result in ascending order. Return the resulting array
function
myFunction
(
a, b
)
{

return
}
Test Cases:
myFunction([1, 2, 3], [3, 4, 5])
Expected
[ 1, 2, 3, 4, 5 ]
myFunction([-10, 22, 333, 42], [-11, 5, 22, 41, 42])
Expected
[ -11, -10, 5, 22, 41, 42, 333]