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I have the code below, which works in swift 2.3. I am struggling to understand how to convert it to swift 3/4 - the issue it those is
Value of type 'Range<Int>' has no member 'map'
let grainSize = CGFloat(0.01)
let min = CGFloat(-3)
let max = CGFloat(3)
let range = Range<Int>(uncheckedBounds: (lower: Int(min/grainSize), upper: Int(max/grainSize)))
let lol = NSRange(range)
var points = range.map { step -> CGPoint in
let i = grainSize * CGFloat(step)
let x = x_base + (i * controller.width / 4.0)
let y = y_base + (m * equation(i))
if x_init == CGFloat.max { x_init = x }
return CGPointMake(x, y)
}
points.append(CGPointMake(x_init, y_base))
points.forEach { renderer.lineTo($0) }
I am wondering if someone can point me in the right direction for this - even to documentation regarding this, as I can't find anything about it in apple docs either =[
736
Ranges in Swift allow us to select parts of Strings, collections, and other types. They're the Swift variant of NSRange which we know from Objective-C although they're not exactly the same in usage, as I'll explain in this blog post. Ranges allow us to write elegant Swift code by making use of the range operator.
< range operators are a shorthand way of creating ranges. For example: let myRange = 1..<3. let myRange = CountableRange<Int>(uncheckedBounds: (lower: 1, upper: 3)) // 1..<3.
The map() Function in Swift. In Swift, you can use the built-in map() function to modify each element in a collection. The map() function loops through the collection, applying a function for each element. The map() function always returns an array where the transformed values are.
Example 2: Uppercase Array Of Strings Using map() In the above example, we have used the map() and uppercased() methods to transform each element of the languages array. The uppercased() method converts each string element of an array to uppercase. And the converted array is stored in the result variable.
Range does not adopt Sequence, just create the range literally as CountableClosedRange
let range = Int(min/grainSize)...Int(max/grainSize)
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