# Introduction to Swift

Apr 24 2024 · Swift 5.10, iOS 17, Xcode 15

## Lesson 01: Swift Basics

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In this demo, you’ll write Swift code to calculate the first few digits in the Fibonacci sequence and store them in an array.

``````var fibonacciSeries: [Int] = []
``````
``````let fibonacci_0 = 0
fibonacciSeries.append(fibonacci_0)
``````
``````print(fibonacciSeries[1])
``````
``````let fibonacci_1 = 1
fibonacciSeries.append(fibonacci_1)
``````
``````let fibonacci_2 = fibonacci_0 + fibonacci_1
fibonacciSeries.append(fibonacci_2)
``````
``````let fibonacci_3 = fibonacci_1 + fibonacci_2
fibonacciSeries.append(fibonacci_3)

let fibonacci_4 = fibonacci_2 + fibonacci_3
fibonacciSeries.append(fibonacci_4)
``````
``````print(fibonacciSeries[0])
print(fibonacciSeries[1])
print(fibonacciSeries[2])
print(fibonacciSeries[3])
print(fibonacciSeries[4])
``````
``````print(fibonacciSeries)
``````