Retrieving a fixed amount of data from a Swift Array

Question

I have var toPlotLines:[Int] = [200, 300, 400, 500, 600, 322, 435] and I want to retrieve the first four integers from the array. Can I do

Answer 1

The error message is misleading. The problem is that toPlotLines[0 ..< n] is not an Array but an ArraySlice:

The Array-like type that represents a sub-sequence of any Array, ContiguousArray, or other ArraySlice.

To create a "real array", use

graphView.graphPoints = Array(toPlotLines[0 ..< n])