Functional way to check if array of numbers is sequential

Question

Let\'s say that an array is sequential when each successful element has the value of previous element + 1. Suppose I have an array of numbers like {5,6,7,

Answer 1

I don't know if it's really an improvement/nicer but you could use Range.

ENumerable.Range(0, myArray.Length).Any(i => myArray[i] != myArray[0] + i)

This returns true if the array doesn't contain sequential number.