# init(x:y:series:) Creates a separate line for each unique value of series. ``` nonisolated init(x: PlottableValue, y: PlottableValue, series: PlottableValue) where X : Plottable, Y : Plottable, S : Plottable ``` ## Parameters `x` The value plotted with x. `y` The value plotted with y. `series` The value with which to split the line series by. ## Discussion ### Discussion Use this initializer to create a multi-line chart from a single data source. ```swift Chart(sunshineData) { LineMark( x: .value("Month", $0.date), y: .value("Hours of Sunshine", $0.hoursOfSunshine) ) .foregroundStyle(by: .value("City", $0.city)) } ```  --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)