Doubt in Recursion array is sorted

[gambhirrahul0 (Rahul Gambhir)]

Please explain me the line no 12. Why we are calling that isSorted function with the conditional?

[pratyush63 (Pratyush Kumar)]

For the array to be sorted, the element at current position must be less than or equal to element at next position. This is why we are using a[0]<a[1] along with the recursive call in the conditional statement