Trevor Whittingham • 7/16/2024

Binary Search In Swift Without Off-By-One Errors

This article provides a detailed tutorial on writing binary search in Swift without off-by-one errors. It introduces a half-open range approach (low..<high) to simplify the logic and avoid common pitfalls. The author builds four helper functions: lowerBound, upperBound, binarySearch, and insertionIndex, all assuming a sorted array. The article explains the invariant, midpoint calculation, and includes code examples with edge cases. It is focused on algorithms, Swift programming, and best practices in software development.

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#algorithms #binary search #Swift