How to calculate SMA in Swift

To calculate the Simple Moving Average (SMA) in Swift based on trading data, you can use a for loop to iterate through the data and keep track of the sum of the last "n" data points, where "n" is the number of periods in the SMA. Then, divide that sum by "n" to get the average.

Here is some sample code to calculate a 10-period SMA:

let data = [3.0, 4.0, 5.0, 4.5, 4.0, 5.5, 6.0, 5.5, 5.0, 4.5]
let n = 10
var sma = 0.0

for i in 0..<n {
    sma += data[i]
}

sma /= Double(n)
print(sma) // 4.75

You can also use the reduce function to calculate the sum of the last "n" data points and then divide by "n".

let sma = data.suffix(n).reduce(0, +) / Double(n)

This is a basic example, but you can also use other functionalities like map and filter to pre-process the data before calculating SMA.