Math & Sequences

Swift Fibonacci Sequence Generator

Generate Fibonacci sequences in Swift using functional sequences and memory-efficient iterators.

Swift Source Code

Editable code sample with line numbers

Swift

Expected Output

When this program is compiled and executed, the terminal outputs:

First 10 Fibonacci numbers in Swift:
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]

How the Code Works

Swift's guard statement validates positive bounds early. We populate a dynamic array with the first n sequence values in O(n) linear time.

Time Complexity

O(N)

Space Complexity

O(N)

Key Takeaways & Best Practices

guard statements guarantee input preconditions before executing logic.
Swift arrays are value types with copy-on-write optimization.

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