Create a function that takes in an array and returns true if all its values are even, and false otherwise.

Not a big deal, your friend says. He writes the following code:

def checkAllEven(arr)
  return arr.all?{num.even?}
end

The code above leads to an undefined local variable, with num being undefined. Fix the code above so that all tests pass:

Examples

checkAllEven([1, 2, 3, 4]) ➞ false

checkAllEven([2, 4, 6]) ➞ true

checkAllEven([5, 6, 8, 10]) ➞ false

checkAllEven([-2, 2, -2, 2]) ➞ true

Notes

N/A