JS
challenger

Get union of two sets

Write a function that takes two Sets as arguments. Create the union of the two sets. Return the result. Hint: try not to switch to Arrays, this would slow down your code
function
myFunction
(
a, b
)
{

return
}
Test Cases:
myFunction(new Set('123'), new Set('234'))
Expected
new Set('1234')
myFunction(new Set([1, 2, 3]), new Set([3, 4, 5]))
Expected
new Set([1, 2, 3, 4, 5])
myFunction(new Set([false, false, NaN]), new Set([true, true, NaN]))
Expected
new Set([false, NaN, true])