Given an array of numbers below
[
	[21, 86, 90, 43, 68, 32],
	[8, 632, 639, 397, 1, 45],
	[15, 379, 10, 76, 90, 35]
]

1. Sort the given array ascending and descending (don't use a built-in function).
2. Sum all array members into 1 value (don't use a built-in function).
3. Find the highest and lowest number (don't use a built-in function).

Please write clean and efficient code. Happy code :)