Which one is faster and why?

Question

(n >= 3 ) && (n <= 99)

OR

 n `elem` [3..99]

Which one is faster and why?

Answer 1

The first one is faster

 (n >= 3) && (n <= 99)

it is doing 3 operations

 n >= 3
 n <= 99
 and

Where as the elem is looking up the item in the array, so is doing upto (99 - 3) * 2 operations.

index = 0
isFound = false
array[] = { 3, 4, 5, 6, ... 98, 99 }

while isFound == false
   isFound = (n == array[index++])