Kata

An onion array is an array that satisfies the following condition for all values of j and k:

If all of the following are true:

• j >= 0
• k >= 0
• j + k = array.length - 1
• j != k

then:

• a[j] + a[k] <= 10

Examples:

[1, 2, 19, 4, 5]   =>  true  (as 1+5 <= 10 and 2+4 <= 10)
[1, 2, 19, 4, 10]  =>  false (as 1+10 > 10)

Write a function named isOnionArray/IsOnionArray/is_onion_array() that returns true if its argument is an onion array and returns false if it is not.