The answer
When the loop reaches the final element of the array, i+1 points to an index that does not exist, triggering an Index Out of Bounds exception.
Handling Edge Cases at the Start and End of a Loop
Why does array[i+1] cause a crash?
More FAQs in Handling Edge Cases at the Start and End of a Loop
An edge case refers to the extreme boundaries of the data, such as the very first element, the very last element, or processing an entirely empty array.
Adjust the loop boundaries. If checking i+1, ensure the loop stops at length-1. If checking i-1, ensure the loop starts at index 1.
If written as i < length, the condition 0 < 0 evaluates to false immediately, and the loop is safely skipped. But complex boundaries (length-1) can cause bugs.
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