An array is monotonic if it is either monotone increasing or monotone decreasing
class Solution { public boolean isMonotonic(int[] A) { boolean increasing = true; boolean decreasing = true; for (int i = 0; i < A.length - 1; ++i) { if (A[i] > A[i+1]) increasing = false; if (A[i] < A[i+1]) decreasing = false; } return increasing || decreasing; } } Can anyone please explain how the return value is working.
increasing || decreasing means increasing OR decreasing. If either variable is true then the whole method will return true, otherwise it will return false.
|| is the logical OR operator.
So, the return value is an example of functional programming || is working as if condition.
return increasing || decreasing; abobe line is similar to
if (increasing || decreasing) return true; else return false 
it will return true if one of them or both is true. False if both are false.
