iOS 18's SwiftUI Charts framework now supports function plotting using LinePlot and AreaPlot. These charts accept functions that map Doubles to Doubles. The functions can handle undefined values by returning Double.nan or Double.infinity. A single function in AreaPlot fills the area between the function and the x-axis. Two functions can define an area between them. Function plotting aids in visualizing data against expected functional approximations. Combining bar charts with function plots allows for direct comparison. An example shows comparing a bar chart to a parabola using both AreaPlot and LinePlot. The new feature was announced at WWDC24. The information was originally posted on useyourloaf.com.