Kata

An array is said to be hollow if it contains 3 or more 0s in the middle that are preceded and followed by the same number of non-zero elements. Furthermore, all the zeroes in the array must be in the middle of the array.

Write a function that accepts an integer array and returns true if it is a hollow array, else false.

Examples

[2, 3, 0, 0, 0, 5, 6] --> true
[2, 0, 0, 0, 5, 6] --> false // 1 nonzero to the left but 2 to the right
[2, 3, 0, 0, 5, 6] --> false // less than 3 zeroes in the middle
[0, 2, 0, 0, 0, 5, 6] --> false // 1 zero not in the middle
[0, 0, 0, 0, 0] --> true // 0 nonzero elements at both ends
[] --> false